Integrated Taxonomic Information System - Taxon Author Search Results

Source: Lamiales of North America Update, database (version 2011)

ITIS records citing this source
 
 Kingdom Plantae
  Acanthaceae -- accepted -- acanthacées
  Acanthomintha (A. Gray) A. Gray -- accepted -- thornmint, thorn-mint
  Acanthomintha duttonii (Abrams) Jokerst -- accepted -- San Mateo thorn-mint
  Acanthomintha ilicifolia (A. Gray) A. Gray -- accepted -- San Diego thornmint, San Diego thorn-mint
  Acanthomintha lanceolata Curran -- accepted -- Santa Clara thorn-mint
  Acanthomintha obovata Jeps. -- accepted -- San Benito thorn-mint
  Acanthomintha obovata ssp. cordata Jokerst -- accepted -- heartleaf thorn-mint
  Acanthomintha obovata ssp. duttonii Abrams -- not accepted -- San Mateo thornmint
  Acanthomintha obovata ssp. obovata Jeps. -- accepted -- San Benito thornmint
  Acanthus L. -- accepted
  Acanthus ebracteatus Vahl -- accepted -- acanthus
  Acanthus mollis L. -- accepted -- bear's breech
  Acanthus polystachyus Delile -- accepted
  Acanthus polystachyus var. pseudopubescens Cufod. -- accepted
  Acanthus pubescens Engl. -- not accepted
  Acanthus spinosus L. -- accepted -- spine acanthus
  Acanthus syriacus Boiss. -- accepted -- Syrian acanthus
  Acinos Mill. -- not accepted
  Acinos arvensis (Lam.) Dandy -- not accepted -- basil thyme
  Acinos thymoides (L.) Moench -- not accepted
  Adenocalymma Mart. ex Meisn. -- accepted
  Adenocalymma alliaceum (Lam.) Miers. -- not accepted
  Adenocalymma obovatum Urb. -- not accepted
  Adenoplea lindleyana (Fortune) Small -- not accepted
  Adhatoda Mill. -- not accepted
  Adhatoda candicans Nees -- not accepted
  Adhatoda carthaginensis (Jacq.) Nees -- not accepted
  Adhatoda dipteracantha Nees -- not accepted
  Adhatoda longiflora Torr. -- not accepted
  Adhatoda vasica Nees -- not accepted
  Aeginetia L. -- accepted
  Aeginetia indica L. -- accepted -- ye gu
  Aegiphila Jacq. -- accepted -- spiritweed
  Aegiphila elata Sw. -- accepted -- tall spiritweed
  Aegiphila integrifolia (Jacq.) B.D. Jacks. -- accepted -- entireleaf spiritweed
  Aegiphila martinicensis Jacq. -- accepted -- Caribbean spiritweed
  Aegiphila martinicensis var. oligoneura (Urb.) Moldenke -- not accepted
  Afzelia cassioides J.F. Gmel. -- not accepted
  Afzelia macrophylla (Nutt.) Kuntze -- not accepted
  Afzelia pectinata (Pursh) Kuntze -- not accepted
  Afzelia pectinata ssp. peninsularis Pennell -- not accepted
  Agalinis Raf. -- accepted -- false foxglove
  Agalinis acuta Pennell -- not accepted -- sandplain gerardia, sandplain false foxglove
  Agalinis aphylla (Nutt.) Raf. -- accepted -- scaleleaf false foxglove
  Agalinis aspera (Douglas ex Benth.) Britton -- accepted -- rough foxglove, tall false foxglove
  Agalinis auriculata (Michx.) S.F. Blake -- accepted -- earleaf false foxglove
  Agalinis besseyana (Britton) Britton -- not accepted
  Agalinis caddoensis Pennell -- accepted -- Caddo false foxglove
  Agalinis calycina Pennell -- accepted -- leoncita false foxglove
  Agalinis decemloba (Greene) Pennell -- accepted -- ten-lobed false foxglove
  Agalinis delicatula Pennell -- not accepted
  Agalinis densiflora (Benth.) S.F. Blake -- accepted -- Osage false foxglove
  Agalinis divaricata (Chapm.) Pennell -- accepted -- pineland false foxglove
  Agalinis edwardsiana Pennell -- accepted -- plateau false foxglove
  Agalinis edwardsiana var. glabra Pennell -- not accepted
  Agalinis fasciculata (Elliott) Raf. -- accepted -- beach false foxglove
  Agalinis fasciculata var. peninsularis Pennell -- not accepted
  Agalinis filicaulis (Benth.) Pennell -- accepted -- Jackson false foxglove
  Agalinis filifolia (Nutt.) Raf. -- accepted -- Seminole false foxglove
  Agalinis flava (L.) B. Boivin -- not accepted
  Agalinis flava var. macrantha (Pennell) B. Boivin -- not accepted
  Agalinis flexicaulis Hays -- accepted -- Hampton false foxglove
  Agalinis gattingeri (Small) Small -- accepted -- roundstem false foxglove
  Agalinis georgiana (C.L. Boynt.) Pennell -- accepted
  Agalinis grandiflora (Benth.) S.F. Blake -- not accepted
  Agalinis grandiflora var. serrata (Torr. ex Benth.) S.F. Blake -- not accepted
  Agalinis harperi Pennell -- accepted -- coastal plain false foxglove
  Agalinis heterophylla (Nutt.) Small -- accepted -- prairie false-foxglove, prairie false foxglove
  Agalinis holmiana Pennell -- not accepted
  Agalinis homalantha Pennell -- accepted -- San Antonio false foxglove
  Agalinis keyensis Pennell -- not accepted
  Agalinis laevigata (Raf.) S.F. Blake -- not accepted
  Agalinis laxa Pennell -- accepted -- twoline false foxglove
  Agalinis levigata (Raf.) S.F. Blake -- not accepted
  Agalinis linifolia (Nutt.) Britton -- accepted -- flaxleaf false foxglove
  Agalinis maritima (Raf.) Raf. -- accepted -- seaside gerardia, saltmarsh false foxglove
  Agalinis maritima var. grandiflora (Benth.) Shinners -- accepted -- saltmarsh false foxglove
  Agalinis maritima var. maritima (Raf.) Raf. -- accepted -- saltmarsh false foxglove
  Agalinis navasotensis Dubrule & Canne-Hill. -- accepted -- Navasota false foxglove
  Agalinis neoscotica (Greene) Fernald -- accepted -- Middleton false foxglove
  Agalinis nuttallii Shinners -- not accepted -- Nuttall's false foxglove
  Agalinis obtusifolia Raf. -- accepted -- tenlobe false foxglove
  Agalinis oligophylla Pennell -- accepted -- ridgestem false foxglove
  Agalinis oligophylla var. pseudaphylla Pennell -- not accepted
  Agalinis parvifolia (Chapm.) Small ex Britton -- not accepted
  Agalinis paupercula (A. Gray) Britton -- not accepted -- smallflower false foxglove
  Agalinis paupercula var. borealis Pennell -- not accepted -- smallflower false foxglove
  Agalinis paupercula var. neoscotica (Greene) Pennell & H. St. John -- not accepted
  Agalinis paupercula var. paupercula (A. Gray) Britton -- not accepted -- smallflower false foxglove
  Agalinis pedicularia (L.) S.F. Blake -- not accepted
  Agalinis pedicularia var. ambigens (Fernald) S.F. Blake -- not accepted
  Agalinis pedicularia var. caesariensis (Pennell) S.F. Blake -- not accepted
  Agalinis pedicularia var. pectinata (Nutt.) S.F. Blake -- not accepted
  Agalinis pinetorum Pennell -- not accepted -- coastalplain false foxglove, coastal plain false foxglove
  Agalinis pinetorum var. delicatula (Pennell) Pennell -- not accepted
  Agalinis plukenetii (Elliott) Raf. -- accepted -- Chattahoochee false foxglove
  Agalinis pseudaphylla (Pennell) Shinners -- not accepted
  Agalinis pulchella Pennell -- accepted -- purple gerardia, St. Mark's false foxglove
  Agalinis purpurea (L.) Pennell -- accepted -- purple false foxglove
  Agalinis purpurea var. carteri Pennell -- not accepted
  Agalinis purpurea var. neoscotica (Greene) B. Boivin -- not accepted
  Agalinis purpurea var. parviflora (Benth.) B. Boivin -- accepted -- smallflower false foxglove
  Agalinis purpurea var. purpurea (L.) Pennell -- accepted -- purple false foxglove
  Agalinis purpurea var. racemulosa (Pennell) B. Boivin -- not accepted
  Agalinis setacea (J.F. Gmel.) Raf. -- accepted -- threadleaf false foxglove
  Agalinis skinneriana (Alph. Wood) Britton -- accepted -- Skinner's false foxglove
  Agalinis spiciflora (Engelm.) Pennell -- not accepted
  Agalinis stenophylla Pennell -- not accepted
  Agalinis strictifolia (Benth.) Pennell -- accepted -- stiffleaf false foxglove
  Agalinis tenella Pennell -- accepted
  Agalinis tenuifolia (Vahl) Raf. -- accepted -- slender-leaf false foxglove, slenderleaf false foxglove
  Agalinis tenuifolia ssp. leucanthera (Raf.) Pennell -- not accepted
  Agalinis tenuifolia var. leucanthera (Raf.) Pennell -- not accepted -- slenderleaf false foxglove
  Agalinis tenuifolia var. macrophylla (Benth.) S.F. Blake -- not accepted -- slenderleaf false foxglove
  Agalinis tenuifolia var. parviflora (Nutt.) Pennell -- not accepted -- slender-leaf false foxglove, slenderleaf false foxglove
  Agalinis tenuifolia var. polyphylla (Small) Pennell -- not accepted -- slenderleaf false foxglove
  Agalinis tenuifolia var. tenuifolia (Vahl) Raf. -- not accepted -- slenderleaf false foxglove
  Agalinis virgata Raf. -- not accepted
  Agalinis virginica (L.) S.F. Blake -- not accepted
  Agalinis viridis (Small) Pennell -- accepted -- green false foxglove
  Agastache Clayton ex Gronov. -- accepted -- giant hyssop
  Agastache anethiodora (Nutt.) Britton -- not accepted
  Agastache barberi (B.L. Rob.) Epling -- not accepted
  Agastache breviflora (A. Gray) Epling -- accepted -- Trans-Pecos giant hyssop
  Agastache breviflora var. havardii (A. Gray) Shinners -- not accepted
  Agastache cana (Hook.) Wooton & Standl. -- accepted -- mosquito plant
  Agastache cusickii (Greenm.) A. Heller -- accepted -- nettleleaf horsemint, Cusick's giant hyssop
  Agastache cusickii var. parva Cronquist -- not accepted
  Agastache foeniculum (Pursh) Kuntze -- accepted -- blue giant-hyssop, blue giant hyssop
  Agastache greenei (Briq.) Wooton & Standl. -- not accepted
  Agastache mearnsii Wooton & Standl. -- accepted -- San Luis Mountain giant hyssop
  Agastache micrantha (A. Gray) Wooton & Standl. -- accepted -- white giant hyssop
  Agastache neomexicana (Briq.) Standl. -- not accepted
  Agastache nepetoides (L.) Kuntze -- accepted -- catnip giant hyssop, yellow giant hyssop
  Agastache occidentalis (Piper) A. Heller -- accepted -- western giant hyssop
  Agastache pallida (Lindl.) Cory -- accepted -- pale giant hyssop
  Agastache pallidiflora (A. Heller) Rydb. -- accepted -- Bill Williams Mountain giant hyssop
  Agastache pallidiflora ssp. havardii (A. Gray) Lint & Epling -- not accepted
  Agastache pallidiflora ssp. mearnsii (Wooton & Standl.) Lint & Epling -- not accepted
  Agastache pallidiflora ssp. neomexicana (Briq.) Lint & Epling -- accepted -- New Mexican giant hyssop, Bill Williams Mountain giant hyssop
  Agastache pallidiflora ssp. neomexicana var. havardii (A. Gray) R.W. Sanders -- not accepted -- Bill Williams Mountain giant hyssop, Havard's giant hyssop
  Agastache pallidiflora ssp. neomexicana var. neomexicana (Briq.) R.W. Sanders -- not accepted -- Bill Williams Mountain giant hyssop, New Mexico giant hyssop
  Agastache pallidiflora ssp. pallidiflora (A. Heller) Rydb. -- accepted -- pallid flower giant hyssop, Bill Williams Mountain giant hyssop
  Agastache pallidiflora ssp. pallidiflora var. gilensis R.W. Sanders -- not accepted -- Bill Williams Mountain giant hyssop, Bill William's hyssop
  Agastache pallidiflora ssp. pallidiflora var. greenei (Briq.) R.W. Sanders -- not accepted -- Bill Williams Mountain giant hyssop
  Agastache pallidiflora ssp. pallidiflora var. pallidiflora (A. Heller) Rydb. -- not accepted -- Bill Williams Mountain giant hyssop, pallid flower giant hyssop
  Agastache pallidiflora ssp. typica Lint & Epling -- not accepted
  Agastache pallidiflora var. gilensis R.W. Sanders -- accepted -- Bill Williams Mountain giant hyssop
  Agastache pallidiflora var. greenei (Briq.) R.W. Sanders -- accepted -- Bill Williams Mountain giant hyssop
  Agastache pallidiflora var. havardii (A. Gray) R.W. Sanders -- accepted -- Bill Williams Mountain giant hyssop
  Agastache pallidiflora var. neomexicana (Briq.) R.W. Sanders -- accepted -- Bill Williams Mountain giant hyssop
  Agastache pallidiflora var. pallidiflora (A. Heller) Rydb. -- accepted -- Bill Williams Mountain giant hyssop
  Agastache parvifolia Eastw. -- accepted -- small-leaved agastache, smallleaf giant hyssop
  Agastache pringlei (Briq.) Lint & Epling -- accepted -- Pringle's giant hyssop
  Agastache pringlei var. verticillata (Wooton & Standl.) R.W. Sanders -- accepted -- Pringle's giant hyssop
  Agastache rupestris (Greene) Standl. -- accepted -- thread-leaf giant hyssop, threadleaf giant hyssop
  Agastache scrophulariifolia (Willd.) Kuntze -- accepted -- purple giant hyssop
  Agastache scrophulariifolia var. mollis (Fernald) A. Heller -- not accepted
  Agastache urticifolia (Benth.) Kuntze -- accepted -- horsemint giant hyssop, nettleleaf giant hyssop
  Agastache urticifolia var. glaucifolia (A. Heller) Cronquist -- accepted -- nettleleaf giant hyssop
  Agastache urticifolia var. urticifolia (Benth.) Kuntze -- accepted -- nettleleaf giant hyssop
  Agastache verticillata Wooton & Standl. -- not accepted
  Agastache wrightii (Greenm.) Wooton & Standl. -- accepted -- Sonoran giant hyssop
  Ajuga L. -- accepted -- bugle
  Ajuga chamaepitys (L.) Schreb. -- accepted -- yellow bugle
  Ajuga genevensis L. -- accepted -- blue bugle
  Ajuga reptans L. -- accepted -- common bugle
  Alectra Thunb. -- accepted
  Alectra aspera (Cham. & Schltdl.) L.O. Williams -- accepted
  Alectra capensis Thunb. -- accepted
  Alectra fluminensis (Vell.) Stearn -- not accepted -- yerba de hierro
  Alloplectus Mart. -- accepted
  Alloplectus ambiguus Urb. -- not accepted
  Aloysia Juss. -- accepted -- beebrush
  Aloysia citridora Paláu -- not accepted
  Aloysia citriodora Paláu -- not accepted
  Aloysia citrodora Paláu -- accepted -- lemon beebrush
  Aloysia gratissima (Gillies & Hook.) Tronc. -- accepted -- whitebrush
  Aloysia gratissima var. gratissima (Gillies & Hook.) Tronc. -- accepted -- whitebrush
  Aloysia gratissima var. schulziae (Standl.) L.D. Benson -- accepted -- bee blossum, whitebrush
  Aloysia ligustrina (Lag.) Small -- not accepted
  Aloysia lycioides Cham. -- not accepted
  Aloysia lycioides var. schulziae (Standl.) Moldenke -- not accepted
  Aloysia macrostachya (Torr.) Moldenke -- accepted -- Rio Grande beebrush
  Aloysia triphylla (L'Hér.) Britton -- not accepted -- lemon beebrush
  Aloysia wrightii (A. Gray) A. Heller -- accepted -- mintbush lippia, lemon verbena, Wright's aloysia, Wright's lippia, Wright's beebrush
  Amarolea americana (L.) Small -- not accepted
  Amarolea megacarpa Small -- not accepted
  Amphianthus Torr. -- not accepted
  Amphianthus pusillus Torr. -- not accepted -- little amphianthus
  Amphilophium Kunth -- accepted
  Amphilophium paniculatum (L.) Kunth -- accepted -- liana de cuello
  Amphitecna Miers -- accepted -- black calabash
  Amphitecna latifolia (Mill.) A.H. Gentry -- accepted -- black calabash
  Andrographis Wall. ex Nees -- accepted -- false waterwillow
  Andrographis echioides (L.) Nees -- accepted -- false waterwillow
  Andrographis paniculata (Burm. f.) Wall. ex Nees -- accepted
  Anemopaegma Mart. ex Meisn. -- accepted
  Anemopaegma carrerense Arm. -- not accepted
  Anemopaegma karstenii Bureau & K. Schum. -- accepted
  Anemopaegma tobagense Urb. -- not accepted
  Angelonia Humb. & Bonpl. -- accepted -- angelon
  Angelonia angustifolia Benth. -- accepted -- narrowleaf angelon
  Angelonia salicariifolia Humb. & Bonpl. -- accepted -- willowleaf angelon
  Anisacanthus Nees -- accepted -- desert honeysuckle
  Anisacanthus insignis A. Gray -- not accepted
  Anisacanthus insignis var. linearis S.H. Hagen -- not accepted
  Anisacanthus junceus (Torr.) Hemsl. -- not accepted
  Anisacanthus linearis (S.H. Hagen) Henrickson & E.J. Lott -- accepted -- dwarf anisacanth, narrowleaf desert honeysuckle
  Anisacanthus puberulus (Torr.) Henrickson & E.J. Lott -- accepted -- dwarf desert honeysuckle
  Anisacanthus quadrifidus (Vahl) Nees -- accepted -- Wright's desert honeysuckle
  Anisacanthus quadrifidus var. wrightii (Torr.) Henrickson -- accepted -- Wright's anisacanth, Wright's desert honeysuckle
  Anisacanthus thurberi (Torr.) A. Gray -- accepted -- desert honeysuckle, Thurber's desert honeysuckle
  Anisacanthus wrightii (Torr.) A. Gray -- not accepted
  Anisostichus capreolata (L.) Bureau -- not accepted
  Anisostichus crucigera (L.) Bureau -- not accepted
  Anoplanthus fasciculatus (Nutt.) Walp. -- not accepted
  Anthacanthus spinosus (Jacq.) Nees -- not accepted
  Antirrhinum L. -- accepted -- snapdragon
  Antirrhinum bellidifolium L. -- accepted -- lilac snapdragon
  Antirrhinum breweri A. Gray -- not accepted
  Antirrhinum calycinum Banks & Sol. -- not accepted
  Antirrhinum cooperi A. Gray -- not accepted
  Antirrhinum cornutum Benth. -- not accepted
  Antirrhinum cornutum var. leptaleum (A. Gray) Munz -- not accepted
  Antirrhinum coulterianum Benth. ex A. DC. -- not accepted
  Antirrhinum coulterianum ssp. orcuttianum (A. Gray) Pennell -- not accepted
  Antirrhinum cyathiferum Benth. -- not accepted
  Antirrhinum elatine L. -- not accepted
  Antirrhinum elmeri Rothm. -- not accepted
  Antirrhinum filipes A. Gray -- not accepted
  Antirrhinum hookerianum Pennell ex Millsp. -- not accepted
  Antirrhinum kelloggii Greene -- not accepted
  Antirrhinum kingii S. Watson -- not accepted
  Antirrhinum kingii var. watsonii (Vasey & Rose) Munz -- not accepted
  Antirrhinum leptaleum A. Gray -- not accepted
  Antirrhinum majus L. -- accepted -- garden snapdragon
  Antirrhinum maurandioides A. Gray -- not accepted
  Antirrhinum multiflorum Pennell -- not accepted
  Antirrhinum nuttallianum Benth. ex A. DC. -- not accepted
  Antirrhinum nuttallianum ssp. nuttallianum Benth. ex A. DC. -- not accepted -- snapdragon
  Antirrhinum nuttallianum ssp. subsessile (A. Gray) D.M. Thomps. -- not accepted
  Antirrhinum orontium L. -- not accepted -- lesser snapdragon, linearleaf snapdragon
  Antirrhinum orontium var. grandiflorum Chav. -- not accepted
  Antirrhinum ovatum Eastw. -- not accepted -- oval-leaved snapdragon
  Antirrhinum spurium L. -- not accepted
  Antirrhinum subcordatum A. Gray -- not accepted -- dimorphic snapdragon
  Antirrhinum subsessile A. Gray -- not accepted
  Antirrhinum tenellum Pursh -- not accepted
  Antirrhinum vexillo-calyculatum ssp. vexillo-calyculatum Kellogg -- not accepted -- snapdragon
  Antirrhinum vexillocalyculatum Kellogg -- not accepted
  Antirrhinum vexillocalyculatum ssp. breweri (A. Gray) D.M. Thomps. -- not accepted
  Antirrhinum vexillocalyculatum ssp. intermedium D.M. Thomps. -- not accepted
  Antirrhinum virga A. Gray -- not accepted
  Antirrhinum watsonii Vasey & Rose -- not accepted
  Antirrhinum wislizeni (Engelm. ex A. Gray) Tidestr. -- not accepted
  Apassalus humistratus (Michx.) Kobuski -- not accepted
  Aphelandra R. Br. -- accepted
  Aphelandra incerta Leonard -- not accepted
  Aphelandra pulcherrima (Jacq.) Kunth -- accepted
  Aphyllon arenosum Suksd. -- not accepted
  Aphyllon cooperi A. Gray -- not accepted
  Aphyllon dugesii S. Watson -- not accepted
  Aphyllon fasciculatum (Nutt.) Torr. & A. Gray -- not accepted
  Aphyllon pinorum (Geyer ex Hook.) A. Gray -- not accepted
  Aphyllon tuberosum (A. Gray) A. Gray -- not accepted
  Aphyllon uniflorum (L.) A. Gray -- not accepted
  Aranella fimbriata auct. non (Kunth) Barnhart -- not accepted
  Arrabidaea DC. -- accepted
  Arrabidaea chica (Humb. & Bonpl.) Verl. -- accepted -- cricketvine
  Arrabidaea magnifica Sprague ex Steenis -- not accepted
  Arrabidaea patellifera (Schltdl.) Sandwith -- accepted
  Arrabidaea rego (Vell.) DC. -- accepted
  Asarina acerifolia (Pennell) Pennell -- not accepted
  Asarina antirrhiniflora (Humb. & Bonpl. ex Willd.) Pennell -- not accepted
  Asarina erubescens (D. Don) Pennell -- not accepted
  Asarina filipes (A. Gray) Pennell -- not accepted
  Asarina petrophila (Coville & C.V. Morton) Pennell -- not accepted
  Asarina stricta (Hook. & Arn.) Pennell -- not accepted
  Asarina wislizeni (Engelm. ex A. Gray) Pennell -- not accepted
  Asystasia Blume -- accepted
  Asystasia coromandeliana Nees -- not accepted
  Asystasia gangetica (L.) T. Anderson -- accepted -- coromandel, Ganges primrose, Philippine violet, Chinese violet
  Audibertia mearnsii Britton -- not accepted
  Audibertia vaseyi Porter -- not accepted
  Aureolaria Raf. -- accepted -- false foxglove
  Aureolaria auriculata (Michx.) Farw. -- not accepted
  Aureolaria calycosa (Mack. & Bush) Pennell -- not accepted
  Aureolaria dispersa (Small) Pennell -- not accepted
  Aureolaria flava (L.) Farw. -- accepted -- smooth yellow false foxglove
  Aureolaria flava ssp. macrantha Pennell -- not accepted
  Aureolaria flava ssp. reticulata (Raf.) Pennell -- not accepted
  Aureolaria flava ssp. typica Pennell -- not accepted
  Aureolaria flava var. flava (L.) Farw. -- not accepted -- smooth yellow false foxglove
  Aureolaria flava var. macrantha Pennell -- not accepted -- smooth yellow false foxglove
  Aureolaria flava var. reticulata (Raf.) Pennell -- not accepted
  Aureolaria grandiflora (Benth.) Pennell -- accepted -- largeflower yellow false foxglove
  Aureolaria grandiflora ssp. cinerea (Pennell) Pennell -- not accepted
  Aureolaria grandiflora ssp. pulchra (Pennell) Pennell -- not accepted
  Aureolaria grandiflora ssp. serrata (Torr. ex Benth.) Pennell -- not accepted
  Aureolaria grandiflora ssp. typica Pennell -- not accepted
  Aureolaria grandiflora var. cinerea Pennell -- not accepted -- largeflower yellow false foxglove
  Aureolaria grandiflora var. grandiflora (Benth.) Pennell -- not accepted -- largeflower yellow false foxglove
  Aureolaria grandiflora var. pulchra Pennell -- not accepted -- largeflower yellow false foxglove
  Aureolaria grandiflora var. serrata (Torr. ex Benth.) Pennell -- not accepted -- largeflower yellow false foxglove
  Aureolaria laevigata (Raf.) Raf. -- not accepted -- entireleaf yellow false foxglove
  Aureolaria levigata (Raf.) Raf. -- accepted -- entireleaf yellow false foxglove
  Aureolaria microcarpa Pennell -- not accepted
  Aureolaria patula (Chapm.) Pennell -- accepted -- spreading yellow false foxglove
  Aureolaria pectinata (Nutt.) Pennell -- accepted -- combleaf yellow false foxglove
  Aureolaria pectinata ssp. eurycarpa (Pennell) Pennell -- not accepted
  Aureolaria pectinata ssp. floridana Pennell -- not accepted
  Aureolaria pectinata ssp. transcendens (Pennell) Pennell -- not accepted
  Aureolaria pectinata ssp. typica Pennell -- not accepted
  Aureolaria pectinata var. eurycarpa Pennell -- not accepted
  Aureolaria pectinata var. floridana (Pennell) Pennell -- not accepted
  Aureolaria pectinata var. ozarkensis Pennell -- not accepted
  Aureolaria pectinata var. transcendens Pennell -- not accepted
  Aureolaria pedicularia (L.) Raf. ex Pennell -- accepted -- fernleaf yellow false foxglove
  Aureolaria pedicularia ssp. ambigens (Fernald) Pennell -- not accepted
  Aureolaria pedicularia ssp. austromontana (Pennell) Pennell -- not accepted
  Aureolaria pedicularia ssp. caesariensis Pennell -- not accepted
  Aureolaria pedicularia ssp. carolinensis Pennell -- not accepted
  Aureolaria pedicularia ssp. intercedens (Pennell) Pennell -- not accepted
  Aureolaria pedicularia ssp. typica Pennell -- not accepted
  Aureolaria pedicularia var. ambigens (Fernald) Farw. -- not accepted -- fernleaf yellow false foxglove
  Aureolaria pedicularia var. austromontana Pennell -- not accepted -- fernleaf yellow false foxglove
  Aureolaria pedicularia var. caesariensis (Pennell) Pennell -- not accepted
  Aureolaria pedicularia var. carolinensis (Pennell) Pennell -- not accepted
  Aureolaria pedicularia var. intercedens Pennell -- not accepted -- fernleaf yellow false foxglove
  Aureolaria pedicularia var. pectinata (Nutt.) Gleason -- not accepted
  Aureolaria pedicularia var. pedicularia (L.) Raf. -- not accepted -- fernleaf yellow false foxglove
  Aureolaria reticulata Raf. -- not accepted
  Aureolaria virginica (L.) Pennell -- accepted -- downy yellow false foxglove
  Avicennia L. -- accepted -- black mangrove, mangrove
  Avicennia africana P. Beauv. -- accepted -- black mangrove
  Avicennia germinans (L.) L. -- accepted -- black mangrove
  Avicennia marina (Forssk.) Vierh. -- accepted -- gray mangrove
  Avicennia marina var. resinifera (G. Forst.) Bakh. -- accepted -- gray mangrove
  Avicennia nitida Jacq. -- not accepted
  Bacopa Aubl. -- accepted -- water hyssop, waterhyssop
  Bacopa acuminata (Walter) B.L. Rob. -- not accepted
  Bacopa acuminata var. microphylla (Raf.) Fernald -- not accepted
  Bacopa caroliniana (Walter) B.L. Rob. -- accepted -- blue waterhyssop
  Bacopa cyclophylla Fernald -- not accepted
  Bacopa egensis (Poepp.) Pennell -- accepted -- Brazilian waterhyssop
  Bacopa eisenii (Kellogg) Pennell -- accepted -- western hydranthele, Gila River waterhyssop
  Bacopa innominata (M. Gómez) Alain -- accepted -- tropical waterhyssop
  Bacopa monnieri (L.) Pennell -- accepted -- herb-of-grace, coastal waterhyssop, herb of grace
  Bacopa nobsiana H. Mason -- not accepted
  Bacopa procumbens (Mill.) Greenm. -- not accepted -- waterhyssop
  Bacopa repens (Sw.) Wettst. -- accepted -- creeping waterhyssop
  Bacopa rotundifolia (Michx.) Wettst. -- accepted -- disk water-hyssop, wet waterhyssop, disc waterhyssop, disk waterhyssop
  Bacopa simulans Fernald -- not accepted -- Chickahominy water-hyssop
  Bacopa stragula Fernald -- not accepted -- mat-forming water-hyssop
  Bacopa stricta (Schrad.) B.L. Rob. -- not accepted -- yerba de culebra
  Ballota L. -- accepted -- horehound
  Ballota borealis Schweigg. -- not accepted
  Ballota nigra L. -- accepted -- black horehound
  Ballota nigra ssp. foetida Hayek -- not accepted
  Ballota nigra var. alba (L.) Sm. -- accepted -- black horehound
  Ballota nigra var. foetida (Hayek) Vis. -- accepted -- black horehound
  Ballota nigra var. nigra L. -- accepted -- black horehound
  Barleria L. -- accepted -- Philippine violet
  Barleria coccinea L. -- not accepted
  Barleria cristata L. -- accepted -- crested Philippine violet
  Barleria lupulina Lindl. -- accepted -- hophead Philippine violet
  Barleria opaca (Vahl) Nees -- accepted -- kwahu
  Barleria prionitis L. -- accepted -- porcupine flower
  Barleria solanifolia L. -- not accepted
  Barleriola Oerst. -- accepted
  Barleriola solanifolia (L.) Oerst. ex Lindau -- accepted -- false Philippine violet
  Bartsia L. -- accepted -- velvetbells
  Bartsia alpina L. -- accepted -- velvetbells
  Bartsia trixago L. -- not accepted
  Batocydia unguis (L.) Mart. ex Britton -- not accepted
  Batocydia unguis-cati (L.) Mart. ex Britton -- not accepted
  Bellardia All. -- accepted -- lineseed
  Bellardia trixago (L.) All. -- accepted -- Mediterranean lineseed
  Beloperone californica Benth. -- not accepted
  Beloperone guttata Brandegee -- not accepted
  Berginia virgata Harv. ex Benth. & Hook. f. -- not accepted
  Besseya Rydb. -- not accepted -- kittentail
  Besseya alpina (A. Gray) Rydb. -- not accepted -- alpine besseya
  Besseya arizonica Pennell -- not accepted -- Arizona coraldrops
  Besseya bullii (Eaton) Rydb. -- not accepted -- Bull's coraldrops
  Besseya cinerea (Raf.) Pennell -- not accepted
  Besseya oblongifolia Pennell -- not accepted -- eggleaf coraldrops
  Besseya plantaginea (E. James) Rydb. -- not accepted -- White River coraldrops
  Besseya ritteriana (Eastw.) Rydb. -- not accepted -- Ritter's coraldrops
  Besseya rubra (Douglas ex Hook.) Rydb. -- not accepted -- red besseya, red kittentail
  Besseya wyomingensis (A. Nelson) Rydb. -- not accepted -- Wyoming kittentail, Wyoming besseya
  Betonica grandiflora Stephan ex Willd. -- not accepted
  Betonica officinalis L. -- not accepted
  Bignonia L. -- accepted
  Bignonia aequinoctialis L. -- not accepted
  Bignonia alliacea Lam. -- not accepted
  Bignonia capensis Thunb. -- not accepted
  Bignonia capreolata L. -- accepted -- cross vine, crossvine
  Bignonia caryophyllea Bello -- not accepted
  Bignonia linearis Cav. -- not accepted
  Bignonia pallida Lindl. -- not accepted
  Bignonia paniculata L. -- not accepted
  Bignonia pyramidata Rich. -- not accepted
  Bignonia radicans L. -- not accepted
  Bignonia rego Vell. -- not accepted
  Bignonia serratifolia Vahl -- not accepted
  Bignonia stans L. -- not accepted
  Bignonia uncata Andrews -- not accepted
  Bignonia unguis-cati L. -- not accepted
  Bignonia venusta Ker Gawl. -- not accepted
  Bignoniaceae -- accepted -- bignonias
  Biovularia olivacea (C. Wright) Kamienski -- not accepted
  Blechum P. Browne -- accepted -- blechum
  Blechum blechum (L.) Millsp. -- not accepted
  Blechum brownei Juss. -- not accepted
  Blechum pyramidatum (Lam.) Urb. -- not accepted -- Browne's blechum
  Blephilia Raf. -- accepted -- pagoda-plant
  Blephilia ciliata (L.) Benth. -- accepted -- downy blephilia, downy pagoda-plant
  Blephilia hirsuta (Pursh) Benth. -- accepted -- hairy pagoda-plant
  Blephilia hirsuta var. glabrata Fernald -- accepted -- hairy pagoda-plant
  Blephilia hirsuta var. hirsuta (Pursh) Benth. -- accepted -- hairy pagoda-plant
  Blephilia subnuda Simmers & Kral -- accepted -- Cumberland pagoda-plant
  Bontia L. -- accepted
  Bontia daphnoides L. -- accepted -- white alling
  Bontia germinans L. -- not accepted
  Boschniakia C.A. Mey. ex Bong. -- accepted -- groundcone
  Boschniakia hookeri Walp. -- not accepted -- Vancouver groundcone
  Boschniakia rossica (Cham. & Schltdl.) B. Fedtsch. -- accepted -- northern groundcone
  Boschniakia strobilacea A. Gray -- not accepted -- California groundcone
  Bouchea Cham. -- accepted
  Bouchea linifolia A. Gray -- accepted -- groovestem bouchea
  Bouchea prismatica (L.) Kuntze -- accepted -- prism bouchea
  Bouchea prismatica var. brevirostra Grenzeb. -- not accepted
  Bouchea prismatica var. longirostra Grenzeb. -- not accepted
  Bouchea spathulata Torr. -- accepted -- spoonleaf
  Brachystigma Pennell -- accepted -- desert foxglove
  Brachystigma wrightii (A. Gray) Pennell -- accepted -- Wright's brachystigma, Arizona desert foxglove
  Bramia monnieri (L.) Drake -- not accepted
  Bramia rotundifolia (Michx.) Britton -- not accepted
  Brazoria Engelm. & A. Gray -- accepted -- brazosmint, brazos-mint
  Brazoria arenaria Lundell -- accepted -- sand brazosmint, sand brazos-mint
  Brazoria enquistii M.W. Turner -- accepted
  Brazoria pulcherrima Lundell -- not accepted -- Centerville brazos-mint
  Brazoria scutellarioides Engelm. & A. Gray -- not accepted -- prairie brazosmint
  Brazoria truncata (Benth.) Engelm. & A. Gray -- accepted -- rattlesnake flower
  Brazoria truncata var. pulcherrima (Lundell) M.W. Turner -- accepted -- Centerville brazos-mint
  Brazoria truncata var. truncata (Benth.) Engelm. & A. Gray -- accepted -- rattlesnake flower
  Buchnera L. -- accepted -- bluehearts
  Buchnera americana L. -- accepted -- bupleurum, American bluehearts
  Buchnera arizonica (A. Gray) Pennell -- not accepted -- Arizona bluehearts
  Buchnera breviflora Pennell -- not accepted
  Buchnera elongata Sw. -- not accepted
  Buchnera floridana Gand. -- accepted -- Florida blueheats
  Buchnera longifolia Kunth -- accepted -- elongated bluehearts
  Buchnera obliqua Benth. -- accepted -- Arizona bluehearts
  Buchnera pusilla Kunth -- accepted -- pygmy bluehearts
  Buddleja L. -- accepted -- butterfly bush, butterflybush
  Buddleja alternifolia Maxim. -- accepted -- fountain butterflybush
  Buddleja asiatica Lour. -- accepted -- dogtail
  Buddleja davidii Franch. -- accepted -- orange eye butterflybush
  Buddleja globosa Hope -- accepted -- orange-ball-tree
  Buddleja indica Lam. -- accepted -- oakleaf butterflybush
  Buddleja lindleyana Fortune -- accepted -- Lindley's butterflybush
  Buddleja madagascariensis Lam. -- accepted -- smokebush
  Buddleja marrubiifolia Benth. -- accepted -- woolly butterflybush
  Buddleja officinalis Maxim. -- accepted -- pole butterflybush
  Buddleja racemosa Torr. -- accepted -- wand butterflybush, Texas butterflybush
  Buddleja racemosa ssp. incana (Torr.) Norm. -- not accepted -- wand butterflybush
  Buddleja racemosa ssp. racemosa Torr. -- not accepted -- wand butterflybush
  Buddleja racemosa var. incana Torr. -- accepted -- wand butterflybush
  Buddleja racemosa var. racemosa Torr. -- accepted -- wand butterflybush
  Buddleja saligna Willd. -- accepted -- squarestem butterflybush
  Buddleja scordioides Kunth -- accepted -- Escobilla butterfly-bush, escobilla butterflybush
  Buddleja sessiliflora Kunth -- accepted -- Rio Grande butterflybush, butterfly-bush
  Buddleja utahensis Coville -- accepted -- Utah butterfly-bush, Panamint butterflybush, Utah butterflybush
  Buttonia McKen ex Benth. -- accepted
  Buttonia hildebrandtii Engl. -- accepted
  Caconapea stricta (Schrad.) Britton -- not accepted
  Calamintha Mill. -- not accepted -- calamint
  Calamintha acinos (L.) Clairv. ex Gaudich. -- not accepted
  Calamintha arkansana (Nutt.) Shinners -- not accepted -- limestone calamint
  Calamintha ascendens Jord. -- not accepted
  Calamintha ashei (Weath.) Shinners -- not accepted -- Ashe's calamint
  Calamintha canescens Torr. & A. Gray ex Benth. -- not accepted
  Calamintha chandleri Brandegee -- not accepted -- San Miguel calamint, San Miguel savory
  Calamintha coccinea (Nutt. ex Hook.) Benth. -- not accepted -- scarlet calamint
  Calamintha dentata Chapm. -- not accepted -- Florida calamint
  Calamintha georgiana (R.M. Harper) Shinners -- not accepted -- Georgia calamint
  Calamintha glabella (Michx.) Benth. -- not accepted -- Ozark calamint
  Calamintha glabella var. angustifolia (Torr.) DeWolf -- not accepted
  Calamintha gracilis Benth. -- not accepted -- slender wild basil
  Calamintha ilicifolia A. Gray -- not accepted
  Calamintha nepeta (L.) Savi -- not accepted -- lesser calamint
  Calamintha nepeta ssp. glandulosa (Req.) P.W. Ball -- not accepted -- lesser calamint
  Calamintha nepeta ssp. nepeta (L.) Savi -- not accepted -- lesser calamint
  Calamintha nepetoides Jord. -- not accepted
  Calamintha officinalis auct. non Moench -- not accepted
  Calamintha sylvatica Bromf. -- not accepted -- woodland calamint
  Calamintha sylvatica ssp. ascendens (Jord.) P.W. Ball -- not accepted -- woodland calamint
  Calamintha sylvatica ssp. sylvatica Bromf. -- not accepted -- woodland calamint
  Calamintha vulgaris (L.) Druce -- not accepted
  Calceolaria L. -- accepted -- slipperwort, slipper flower
  Calceolaria chelidonioides Kunth -- not accepted -- bedding slipperwort
  Calceolaria multiflora Cav. -- not accepted -- slipper flower
  Calceolaria scabiosifolia Roem. & Schult. -- not accepted
  Calceolaria tripartita Ruiz & Pav. -- accepted -- splitleaf slipperwort
  Calceolariaceae -- accepted
  Callicarpa L. -- accepted -- beautyberry
  Callicarpa americana L. -- accepted -- American beautyberry
  Callicarpa americana var. lactea F.J. Müll. -- not accepted
  Callicarpa ampla Schauer -- accepted -- capa rosa, caparosa
  Callicarpa candicans (Burm. f.) Hochr. -- accepted
  Callicarpa candicans var. paucinervia (Merr.) Fosberg -- accepted
  Callicarpa dichotoma (Lour.) K. Koch -- accepted -- purple beautyberry
  Callicarpa formosana Rolfe -- accepted
  Callicarpa japonica Thunb. -- accepted -- Japanese callicarpa
  Callicarpa lamii Hosok. -- accepted
  Callicarpa purpurea Juss. -- not accepted
  Callitriche L. -- accepted -- water-starwort
  Callitriche anceps Fernald -- not accepted
  Callitriche austinii Engelm. -- not accepted
  Callitriche autumnalis L. -- not accepted
  Callitriche bolanderi Hegelm. -- not accepted
  Callitriche brutia Pentagna -- accepted
  Callitriche brutia var. hamulata (Kütz. ex W.D.J. Koch) Lansdown -- accepted
  Callitriche deflexa A. Braun -- not accepted
  Callitriche deflexa var. austinii (Engelm.) Hegelm. -- not accepted
  Callitriche deflexa var. subsessilis Fassett -- not accepted
  Callitriche fassettii Schotsman -- accepted -- Fassett's water-starwort
  Callitriche hamulata Kütz. ex W.D.J. Koch -- not accepted
  Callitriche hermaphroditica L. -- accepted -- northern water-starwort, autumn waterstarwort, autumn water-starwort, northern waterstarwort, scarlet waterstarwort
  Callitriche heterophylla Pursh -- accepted -- greater waterstarwort, larger waterstarwort, variedleaf waterstarwort, differentleaf waterstarwort, twoheaded water-starwort
  Callitriche heterophylla ssp. bolanderi (Hegelm.) Calder & Roy L. Taylor -- not accepted -- Bolander's water-starwort
  Callitriche heterophylla ssp. heterophylla Pursh -- not accepted -- twoheaded water-starwort, greater waterstarwort, twoheaded waterstarwort
  Callitriche heterophylla var. bolanderi (Hegelm.) Fassett -- accepted -- Bolander's water-starwort
  Callitriche heterophylla var. heterophylla Pursh -- accepted -- twoheaded water-starwort
  Callitriche intermedia Hoffm. -- not accepted -- narrowleaf water-starwort, narrowleaf waterstarwort
  Callitriche intermedia ssp. hamulata (Kütz. ex W.D.J. Koch) Clapham -- not accepted -- narrowleaf water-starwort, narrowleaf waterstarwort
  Callitriche intermedia ssp. intermedia Hoffm. -- not accepted -- narrowleaf water-starwort, narrowleaf waterstarwort
  Callitriche longipedunculata Morong -- accepted -- longstock water-starwort
  Callitriche marginata Torr. -- accepted -- winged water-starwort
  Callitriche nuttallii Torr. -- not accepted -- Nuttall's waterstarwort
  Callitriche palustris L. -- accepted -- vernal water-starwort, spring waterstarwort, spiny waterstarwort, vernal waterstarwort
  Callitriche palustris var. verna (L.) Fenley ex Jeps. -- not accepted
  Callitriche pedunculosa Nutt. -- accepted -- Nuttall's water-starwort
  Callitriche peploides Nutt. -- accepted -- matted waterstarwort, matted water-starwort
  Callitriche peploides var. peploides Nutt. -- accepted
  Callitriche peploides var. semialata Fassett -- accepted
  Callitriche sepulta S. Watson -- not accepted
  Callitriche stagnalis Scop. -- accepted -- pond water-starwort
  Callitriche stenoptera Lansdown -- accepted
  Callitriche terrestris Raf. -- accepted -- terrestrial water-starwort, terrestrial waterstarwort
  Callitriche trochlearis Fassett -- accepted -- effluent water-starwort
  Callitriche verna L. -- not accepted
  Calophanes angusta A. Gray -- not accepted
  Calophanes decumbens A. Gray -- not accepted
  Calophanes humistrata (Michx.) Shuttlw. ex Nees -- not accepted
  Calophanes linearis (Torr. & A. Gray) A. Gray -- not accepted
  Calpidisca standleyae Barnhart -- not accepted
  Campsis Lour. -- accepted
  Campsis radicans (L.) Seem. ex Bureau -- accepted -- common trumpetcreeper, cow-itch, trumpet creeper
  Capraria L. -- accepted
  Capraria biflora L. -- accepted -- goatweed
  Capraria crustacea L. -- not accepted
  Capraria durantifolia L. -- not accepted
  Capraria mexicana Moric. ex Benth. -- accepted -- Tamaulipan tea
  Carlowrightia A. Gray -- accepted -- wrightwort
  Carlowrightia arizonica A. Gray -- accepted -- Arizona carlowrightia, Arizona wrightwort
  Carlowrightia linearifolia (Torr.) A. Gray -- accepted -- heath wrightwort
  Carlowrightia mexicana Henrickson & T.F. Daniel -- accepted -- Mexican wrightwort
  Carlowrightia parviflora (Buckley) Wassh. -- accepted -- smallflower wrightwort
  Carlowrightia parvifolia Brandegee -- accepted -- littleleaf wrightwort
  Carlowrightia pubens A. Gray -- not accepted
  Carlowrightia serpyllifolia A. Gray -- accepted -- Trans-Pecos wrightwort
  Carlowrightia texana Henrickson & T.F. Daniel -- accepted -- Texas wrightwort
  Carlowrightia torreyana Wassh. -- accepted -- Torrey's wrightwort
  Caryopteris Bunge -- accepted
  Caryopteris X clandonensis hort. ex Rehder -- accepted -- caryopteris
  Castilleja Mutis ex L. f. -- accepted -- castilléjie, Indian paintbrush
  Castilleja acuminata auct. non (Pursh) Spreng. -- not accepted
  Castilleja affinis Hook. & Arn. -- accepted -- coast Indian paintbrush
  Castilleja affinis ssp. affinis Hook. & Arn. -- accepted -- coast Indian paintbrush
  Castilleja affinis ssp. insularis (Eastw.) Munz -- not accepted
  Castilleja affinis ssp. litoralis (Pennell) T.I. Chuang & Heckard -- accepted -- coast Indian paintbrush
  Castilleja affinis ssp. neglecta (Zeile) T.I. Chuang & Heckard -- accepted -- Tiburon Indian paintbrush, Tiburon paintbrush
  Castilleja affinis var. contentiosa (J.F. Macbr.) Bacig. -- not accepted
  Castilleja ambigua Hook. & Arn. -- accepted -- johnny-nip
  Castilleja ambigua ssp. ambigua Hook. & Arn. -- accepted -- johnny-nip
  Castilleja ambigua ssp. humboldtiensis (D.D. Keck) T.I. Chuang & Heckard -- accepted -- Humboldt Bay owl's clover
  Castilleja ambigua ssp. insalutata (Jeps.) T.I. Chuang & Heckard -- accepted -- johnny-nip
  Castilleja angustifolia (Nutt.) G. Don -- accepted -- northwestern paintbrush, northwestern Indian paintbrush
  Castilleja angustifolia var. angustifolia (Nutt.) G. Don -- accepted -- northwestern Indian paintbrush
  Castilleja angustifolia var. bradburii (Nutt.) Fernald -- not accepted
  Castilleja angustifolia var. dubia A. Nelson -- accepted
  Castilleja angustifolia var. flavescens (Pennell ex Edwin) N.H. Holmgren -- accepted -- northwestern Indian paintbrush, northwestern paintbrush
  Castilleja angustifolia var. hispida (Benth.) Fernald -- not accepted
  Castilleja angustifolia var. whitedii Piper -- not accepted
  Castilleja annua Pennell -- accepted -- Fairbanks annual Indian paintbrush
  Castilleja applegatei Fernald -- accepted -- pine Indian paintbrush, wavyleaf paintbrush, wavyleaf Indian paintbrush
  Castilleja applegatei ssp. applegatei Fernald -- accepted -- wavyleaf Indian paintbrush
  Castilleja applegatei ssp. disticha (Eastw.) T.I. Chuang & Heckard -- accepted -- wavyleaf Indian paintbrush
  Castilleja applegatei ssp. martinii (Abrams) T.I. Chuang & Heckard -- accepted -- wavyleaf Indian paintbrush, desert Indian paintbrush, Martin's paintbrush
  Castilleja applegatei ssp. pallida (Eastw.) T.I. Chuang & Heckard -- accepted -- wavyleaf Indian paintbrush
  Castilleja applegatei ssp. pinetorum (Fernald) T.I. Chuang & Heckard -- accepted -- wavyleaf Indian paintbrush
  Castilleja applegatei var. applegatei Fernald -- not accepted -- Applegate's Indian paintbrush
  Castilleja applegatei var. breweri (Fernald) N.H. Holmgren -- not accepted
  Castilleja applegatei var. fragilis (Zeile) N.H. Holmgren -- not accepted
  Castilleja applegatei var. pallida (Eastw.) N.H. Holmgren -- not accepted
  Castilleja applegatei var. pinetorum (Fernald) N.H. Holmgren -- not accepted
  Castilleja applegatei var. viscida (Rydb.) Ownbey -- not accepted
  Castilleja aquariensis N.H. Holmgren -- accepted -- Aquarius Plateau Indian paintbrush, Aquarius paintbrush
  Castilleja arachnoidea Greenm. -- accepted -- cobweb paintbrush, cobwebby Indian paintbrush
  Castilleja arachnoidea ssp. arachnoidea Greenm. -- not accepted -- cobwebby Indian paintbrush
  Castilleja arachnoidea ssp. schizotricha (Greenm.) Pennell -- not accepted
  Castilleja arachnoidea ssp. shastensis (Eastw.) Pennell -- not accepted
  Castilleja arvensis Cham. & Schltdl. -- accepted -- field Indian paintbrush
  Castilleja attenuata (A. Gray) T.I. Chuang & Heckard -- accepted -- Indian paintbrush, attenuate Indian paintbrush
  Castilleja austromontana Standl. & Blumer -- accepted -- Rincon Indian paintbrush, Rincon Mountain Indian paintbrush
  Castilleja barnebyana Eastw. -- not accepted
  Castilleja brevilobata Piper -- not accepted -- short-lobed red paintbrush
  Castilleja brevistyla (Hoover) T.I. Chuang & Heckard -- accepted -- shortstyle Indian paintbrush
  Castilleja breweri Fernald -- not accepted
  Castilleja breweri var. pallida Eastw. -- not accepted
  Castilleja calcicola Pennell ex Edwin -- not accepted
  Castilleja californica Abrams -- not accepted
  Castilleja campestris (Benth.) T.I. Chuang & Heckard -- accepted -- vernal pool Indian paintbrush
  Castilleja campestris ssp. campestris (Benth.) T.I. Chuang & Heckard -- accepted -- vernal pool Indian paintbrush
  Castilleja campestris ssp. succulenta (Hoover) T.I. Chuang & Heckard -- accepted -- succulent owl's-clover, fleshy owl's-clover
  Castilleja caudata (Pennell) Rebrist. -- accepted -- Port Clarence Indian paintbrush
  Castilleja caudata var. auricoma (Pennell) Hultén -- accepted -- Port Clarence Indian paintbrush
  Castilleja caudata var. caudata (Pennell) Rebrist. -- accepted -- Port Clarence Indian paintbrush
  Castilleja cervina Greenm. -- accepted -- deer Indian paintbrush
  Castilleja chambersii M. Egger & Meinke -- accepted -- Chambers' paintbrush
  Castilleja chlorotica Piper -- accepted -- green-tinged paintbrush, greentinge Indian paintbrush
  Castilleja christii N.H. Holmgren -- accepted -- Christ's Indian paintbrush
  Castilleja chromosa A. Nelson -- not accepted
  Castilleja chrymactis Pennell -- accepted -- green Indian paintbrush
  Castilleja chrysantha Greenm. -- accepted -- yellow Wallowa Indian paintbrush
  Castilleja ciliata Pennell -- not accepted
  Castilleja cinerea A. Gray -- accepted -- ash-gray Indian paintbrush
  Castilleja citrina Pennell -- not accepted
  Castilleja clokeyi Pennell -- not accepted
  Castilleja coccinea (L.) Spreng. -- accepted -- Indian paintbrush, scarlet Indian paintbrush
  Castilleja confusa Greene -- not accepted
  Castilleja covilleana L.F. Hend. -- accepted -- Coville's Indian paintbrush
  Castilleja crista-galli Rydb. -- accepted -- mountainside Indian paintbrush
  Castilleja cruenta Standl. -- not accepted
  Castilleja cryptantha Pennell & G.N. Jones -- accepted -- obscure Indian paintbrush
  Castilleja culbertsonii Greene -- not accepted -- Culbertson Indian paintbrush
  Castilleja cusickii Greenm. -- accepted -- Cusick's paintbrush, Cusick's Indian paintbrush
  Castilleja densiflora (Benth.) T.I. Chuang & Heckard -- accepted -- denseflower Indian paintbrush
  Castilleja densiflora ssp. densiflora (Benth.) T.I. Chuang & Heckard -- accepted -- denseflower Indian paintbrush
  Castilleja densiflora ssp. gracilis (Benth.) T.I. Chuang & Heckard -- accepted -- denseflower Indian paintbrush
  Castilleja densiflora ssp. obispoensis (D.D. Keck) T.I. Chuang & Heckard -- accepted -- Obispo Indian paintbrush
  Castilleja dissitiflora N.H. Holmgren -- accepted -- Mount Hamilton paintbrush, Mt. Hamilton Indian paintbrush
  Castilleja disticha Eastw. -- not accepted
  Castilleja dixonii Fernald -- not accepted
  Castilleja douglasii Benth. -- not accepted
  Castilleja douglasii ssp. insularis (Eastw.) Pennell -- not accepted
  Castilleja elata Piper -- not accepted
  Castilleja elegans Malte -- accepted -- elegant Indian paintbrush
  Castilleja elkoensis Edwin -- not accepted
  Castilleja elmeri Fernald -- accepted -- Wenatchee Indian paintbrush
  Castilleja elongata Pennell -- not accepted -- tall paintbrush
  Castilleja ewanii Eastw. -- not accepted
  Castilleja exilis A. Nelson -- not accepted
  Castilleja exserta (A. Heller) T.I. Chuang & Heckard -- accepted -- Indian paintbrush, exserted Indian paintbrush
  Castilleja exserta ssp. exserta (A. Heller) T.I. Chuang & Heckard -- accepted -- exserted Indian paintbrush, owl clover
  Castilleja exserta ssp. latifolia (S. Watson) T.I. Chuang & Heckard -- accepted -- wideleaf Indian paintbrush
  Castilleja exserta ssp. venusta (A. Heller) T.I. Chuang & Heckard -- accepted -- exserted Indian paintbrush
  Castilleja filifolia Eastw. -- not accepted
  Castilleja flava S. Watson -- accepted -- yellow paintbrush, yellow Indian paintbrush
  Castilleja flava var. flava S. Watson -- accepted -- yellow Indian paintbrush
  Castilleja flava var. rustica (Piper) N.H. Holmgren -- accepted -- country Indian paintbrush
  Castilleja flavescens Pennell ex Edwin -- not accepted
  Castilleja foliolosa Hook. & Arn. -- accepted -- Texas Indian paintbrush
  Castilleja franciscana Pennell -- not accepted
  Castilleja fraterna Greenm. -- accepted -- fraternal Indian paintbrush
  Castilleja fulva Pennell -- accepted -- Elko Indian paintbrush
  Castilleja genevievana G.L. Nesom -- accepted -- Genevieve's Indian paintbrush
  Castilleja glandulifera Pennell -- accepted -- gland Indian paintbrush
  Castilleja glandulifera ssp. pallida (Eastw.) Pennell -- not accepted
  Castilleja gleasoni Elmer -- not accepted
  Castilleja gracillima Rydb. -- not accepted
  Castilleja grisea Dunkle -- accepted -- San Clemente Island Indian paintbrush
  Castilleja gyroloba Pennell -- not accepted
  Castilleja haydenii (A. Gray) Cockerell -- accepted -- Hayden's Indian paintbrush
  Castilleja henryae Pennell -- not accepted
  Castilleja hispida Benth. -- accepted -- harsh Indian paintbrush
  Castilleja hispida ssp. abbreviata (Fernald) Pennell -- not accepted
  Castilleja hispida ssp. acuta Pennell -- accepted -- acute Indian paintbrush
  Castilleja hispida ssp. brevilobata (Piper) T.I. Chuang & Heckard -- accepted -- short-lobe Indian paintbrush
  Castilleja hispida ssp. hispida Benth. -- accepted -- harsh Indian paintbrush
  Castilleja hispida var. acuta (Pennell) Ownbey -- not accepted
  Castilleja hololeuca Greene -- not accepted -- white-felted paintbrush
  Castilleja hololeuca ssp. grisea (Dunkle) Munz -- not accepted
  Castilleja hyetophila Pennell -- accepted -- coastal red Indian paintbrush
  Castilleja hyperborea Pennell -- accepted -- northern Indian paintbrush
  Castilleja inconstans Standl. -- not accepted
  Castilleja indivisa Engelm. -- accepted -- Texas paintbrush, entireleaf Indian paintbrush
  Castilleja inflata Pennell -- not accepted
  Castilleja integra A. Gray -- accepted -- squawfeather, wholeleaf Indian paintbrush
  Castilleja integra var. gloriosa (Britton) Cockerell -- accepted -- wholeleaf Indian paintbrush, squawfeather
  Castilleja integra var. integra A. Gray -- accepted -- wholeleaf Indian paintbrush
  Castilleja inverta (A. Nelson & J.F. Macbr.) Pennell & Ownbey -- not accepted
  Castilleja jepsonii Bacig. & Heckard -- not accepted
  Castilleja kaibabensis N.H. Holmgren -- accepted -- Kaibab Indian paintbrush, Kaibab Plateau Indian paintbrush, Kaibab paintbrush
  Castilleja kraliana J.R. Allison -- accepted -- Cahaba Indian paintbrush
  Castilleja kuschei Eastw. -- accepted -- Kusche's Indian paintbrush
  Castilleja labiata Pennell -- not accepted
  Castilleja lacera (Benth.) T.I. Chuang & Heckard -- accepted -- cutleaf Indian paintbrush
  Castilleja lanata A. Gray -- accepted -- Sierran woolly Indian paintbrush, woolly paintbrush, Sierra woolly Indian paintbrush
  Castilleja lanata ssp. hololeuca (Greene) T.I. Chuang & Heckard -- accepted -- whitefelt Indian paintbrush
  Castilleja lanata ssp. lanata A. Gray -- accepted -- Sierra woolly Indian paintbrush
  Castilleja lapidicola A. Heller -- not accepted
  Castilleja lasiorhyncha (A. Gray) T.I. Chuang & Heckard -- accepted -- San Bernardino Mountains Indian paintbrush, San Bernardino Mountains orthocarpus
  Castilleja lassenensis Eastw. -- not accepted -- Lemmon's Indian paintbrush
  Castilleja latebracteata Pennell -- not accepted
  Castilleja latifolia Hook. & Arn. -- accepted -- Monterey Indian paintbrush
  Castilleja latifolia ssp. mendocinensis Eastw. -- not accepted
  Castilleja lauta A. Nelson -- not accepted
  Castilleja laxa A. Gray -- not accepted
  Castilleja lemmonii A. Gray -- accepted -- Lemmon's paintbrush, Lemmon's Indian paintbrush
  Castilleja leonardii Rydb. -- not accepted
  Castilleja leschkeana J.T. Howell -- not accepted -- Point Reyes paintbrush
  Castilleja levisecta Greenm. -- accepted -- golden paintbrush, golden Indian paintbrush
  Castilleja linariifolia Benth. -- accepted -- Wyoming paintbrush, Wyoming Indian paintbrush
  Castilleja linariifolia var. omnipubescens (Pennell) Clokey -- not accepted
  Castilleja lineariiloba (Benth.) T.I. Chuang & Heckard -- accepted -- sagebrush Indian paintbrush
  Castilleja linearis Rydb. -- not accepted
  Castilleja lineata Greene -- accepted -- marsh-meadow Indian paintbrush, marshmeadow Indian paintbrush
  Castilleja linoides A. Gray -- not accepted
  Castilleja litoralis Pennell -- not accepted
  Castilleja longispica A. Nelson -- not accepted
  Castilleja ludoviciana Pennell -- not accepted -- Jeff Davis Parish Indian paintbrush
  Castilleja lutea A. Heller -- not accepted
  Castilleja luteovirens Rydb. -- not accepted
  Castilleja lutescens (Greenm.) Rydb. -- accepted -- stiff yellow Indian paintbrush
  Castilleja magnistylis Edwin -- not accepted
  Castilleja martinii Abrams -- not accepted
  Castilleja martinii ssp. ewanii (Eastw.) Munz -- not accepted -- Ewan's Indian paintbrush
  Castilleja martinii var. clokeyi (Pennell) N.H. Holmgren -- not accepted
  Castilleja martinii var. ewanii (Eastw.) N.H. Holmgren -- not accepted
  Castilleja martinii var. martinii Abrams -- not accepted -- Martin's Indian paintbrush
  Castilleja mearnsii Pennell -- not accepted
  Castilleja mendocinensis (Eastw.) Pennell -- accepted -- Mendocino Coast Indian paintbrush, Mendocino coast paintbrush
  Castilleja mexicana (Hemsl.) A. Gray -- accepted -- Mexican Indian paintbrush
  Castilleja miniata Douglas ex Hook. -- accepted -- great red Indian paintbrush, great red Indian-paintbrush, scarlet Indian paintbrush, scarlet paintbrush, giant red Indian paintbrush
  Castilleja miniata ssp. dixonii (Fernald) Kartesz -- accepted -- giant red Indian paintbrush
  Castilleja miniata ssp. elata (Piper) Munz -- accepted -- Siskiyou Indian paintbrush
  Castilleja miniata ssp. miniata Douglas ex Hook. -- accepted -- giant red Indian paintbrush
  Castilleja miniata var. dixonii (Fernald) A. Nelson & J.F. Macbr. -- not accepted
  Castilleja miniata var. miniata Douglas ex Hook. -- not accepted -- green Indian paintbrush
  Castilleja minor (A. Gray) A. Gray -- accepted -- lesser Indian paintbrush, alkali Indian paintbrush
  Castilleja minor ssp. minor (A. Gray) A. Gray -- accepted -- lesser Indian paintbrush, small annual Indian paintbrush, small Indian paintbrush, smallflower paintbrush
  Castilleja minor ssp. spiralis (Jeps.) T.I. Chuang & Heckard -- accepted -- annual Indian paintbrush, lesser Indian paintbrush
  Castilleja mogollonica Pennell -- not accepted -- White Mountains paintbrush
  Castilleja mollis Pennell -- accepted -- softleaf Indian paintbrush, soft-leaved paintbrush, soft-leaved Indian paintbrush
  Castilleja montigena Heckard -- accepted -- Heckard's Indian paintbrush
  Castilleja muelleri Pennell -- not accepted -- Kluane Lake Indian paintbrush
  Castilleja nana Eastw. -- accepted -- dwarf alpine paintbrush, dwarf alpine Indian paintbrush
  Castilleja neglecta Zeile -- not accepted
  Castilleja nervata Eastw. -- accepted -- Trans-Pecos Indian paintbrush
  Castilleja nivea Pennell & Ownbey -- accepted -- snow Indian paintbrush
  Castilleja oblongifolia A. Gray -- not accepted
  Castilleja occidentalis Torr. -- accepted -- western Indian paintbrush
  Castilleja oregonensis Gand. -- not accepted
  Castilleja oreopola Greenm. -- not accepted
  Castilleja oreopola ssp. albida Pennell -- not accepted
  Castilleja oresbia Greenm. -- accepted -- pale Wallowa Indian paintbrush
  Castilleja organorum Standl. -- accepted -- Organ Mountain Indian paintbrush
  Castilleja ornata Eastw. -- accepted -- glowing Indian paintbrush
  Castilleja ownbeyana Pennell -- not accepted -- common Wallowa paintbrush
  Castilleja pallescens (A. Gray) Greenm. -- accepted -- pale paintbrush, pale Indian paintbrush
  Castilleja pallescens var. inverta (A. Nelson & J.F. Macbr.) Edwin -- accepted -- pale Indian paintbrush
  Castilleja pallescens var. pallescens (A. Gray) Greenm. -- accepted -- pale Indian paintbrush
  Castilleja pallida (L.) Kunth -- accepted -- boreal Indian paintbrush
  Castilleja pallida ssp. caudata Pennell -- not accepted
  Castilleja pallida ssp. elegans (Malte) Pennell -- not accepted
  Castilleja pallida ssp. septentrionalis (Lindl.) Scoggan -- not accepted
  Castilleja pallida var. caudata (Pennell) B. Boivin -- not accepted
  Castilleja pallida var. elegans (Malte) B. Boivin -- not accepted
  Castilleja pallida var. septentrionalis (Lindl.) A. Gray -- not accepted
  Castilleja parviflora Bong. -- accepted -- mountain Indian paintbrush
  Castilleja parviflora var. albida (Pennell) Ownbey -- accepted -- smallflower Indian paintbrush
  Castilleja parviflora var. olympica (G.N. Jones) Ownbey -- accepted -- Olympic Indian paintbrush
  Castilleja parviflora var. oreopola (Greenm.) Ownbey -- accepted -- Henry Indian paintbrush
  Castilleja parviflora var. parviflora Bong. -- accepted -- smallflower Indian paintbrush
  Castilleja parvula Rydb. -- accepted -- Tushar Plateau Indian paintbrush, Tushar Indian paintbrush
  Castilleja parvula var. revealii (N.H. Holmgren) N.D. Atwood -- not accepted
  Castilleja patriotica Fernald -- accepted -- Huachuca Indian paintbrush, Huachuca Mountain Indian paintbrush
  Castilleja patriotica var. blumeri (Standl.) Kearney & Peebles -- not accepted
  Castilleja payneae Eastw. -- not accepted
  Castilleja peckiana Pennell -- accepted -- Peck's Indian paintbrush, peakpaintbrush
  Castilleja peirsonii Eastw. -- not accepted
  Castilleja pilosa (S. Watson) Rydb. -- accepted -- parrothead Indian paintbrush, hairy paintbrush
  Castilleja pilosa ssp. jusselii (Eastw.) Munz -- not accepted
  Castilleja pilosa var. inverta (A. Nelson & J.F. Macbr.) A. Nelson & J.F. Macbr. -- not accepted
  Castilleja pilosa var. longispica (A. Nelson) N.H. Holmgren -- accepted -- longspike Indian paintbrush
  Castilleja pilosa var. pilosa (S. Watson) Rydb. -- accepted -- parrothead Indian paintbrush
  Castilleja pilosa var. steenensis (Pennell) N.H. Holmgren -- accepted -- Steenes Indian paintbrush, Steen's mountain paintbrush
  Castilleja pinetorum Fernald -- not accepted
  Castilleja plagiotoma A. Gray -- accepted -- Mojave Indian paintbrush
  Castilleja praeterita Heckard & Bacig. -- accepted -- Salmon Creek Indian paintbrush
  Castilleja pruinosa Fernald -- accepted -- frosted Indian paintbrush
  Castilleja pruinosa ssp. gleasoni (Elmer) Munz -- not accepted
  Castilleja psittacina (Eastw.) Pennell -- not accepted
  Castilleja puberula Rydb. -- accepted -- shortflower Indian paintbrush
  Castilleja pulchella Rydb. -- accepted -- beautiful Indian paintbrush
  Castilleja purpurea (Nutt.) G. Don -- accepted -- Indian paintbrush, downy Indian paintbrush
  Castilleja purpurea var. citrina (Pennell) Shinners -- accepted -- prairie Indian paintbrush, citron paintbrush
  Castilleja purpurea var. lindheimeri (A. Gray) Shinners -- accepted -- Lindheimer's Indian paintbrush
  Castilleja purpurea var. purpurea (Nutt.) G. Don -- accepted -- downy Indian paintbrush
  Castilleja pyramidalis Edwin -- not accepted
  Castilleja raupii Pennell -- accepted -- Raup's Indian paintbrush, castilléjie de Raup
  Castilleja revealii N.H. Holmgren -- accepted -- Bryce Canyon Indian paintbrush
  Castilleja rhexiifolia Rydb. -- accepted -- splitleaf Indian paintbrush, rhexialeaf paintbrush
  Castilleja rhexiifolia var. sulphurea (Rydb.) N.D. Atwood -- not accepted
  Castilleja rigida Eastw. -- accepted -- rigid Indian paintbrush
  Castilleja roseana Eastw. -- not accepted
  Castilleja rubicundula (Jeps.) T.I. Chuang & Heckard -- accepted -- cream sacs
  Castilleja rubicundula ssp. lithospermoides (Benth.) T.I. Chuang & Heckard -- accepted -- cream sacs
  Castilleja rubicundula ssp. rubicundula (Jeps.) T.I. Chuang & Heckard -- accepted -- cream sacs
  Castilleja rubida Piper -- accepted -- little reddish Indian paintbrush
  Castilleja rubida var. monoensis (Jeps.) Edwin -- not accepted
  Castilleja rupicola Piper ex Fernald -- accepted -- cliff Indian paintbrush
  Castilleja rustica Piper -- not accepted
  Castilleja salsuginosa N.H. Holmgren -- accepted -- Monte Neva Indian paintbrush, Monte Neva paintbrush
  Castilleja scabrida Eastw. -- accepted -- rough paintbrush, rough Indian paintbrush
  Castilleja scabrida var. barnebyana (Eastw.) N.H. Holmgren -- accepted -- Barneby's Indian paintbrush
  Castilleja scabrida var. scabrida Eastw. -- accepted -- Zion Indian paintbrush
  Castilleja schizotricha Greenm. -- accepted -- splithair Indian paintbrush
  Castilleja septentrionalis Lindl. -- accepted -- Labrador Indian paintbrush
  Castilleja sessiliflora Pursh -- accepted -- downy paintedcup, Great Plains Indian paintbrush, Indian paintbrush
  Castilleja setosa Pennell -- accepted
  Castilleja spiralis Jeps. -- not accepted
  Castilleja steenensis Pennell -- not accepted
  Castilleja stenantha A. Gray -- not accepted
  Castilleja stenantha ssp. spiralis (Jeps.) Munz -- not accepted
  Castilleja subinclusa Greene -- accepted -- longleaf Indian paintbrush
  Castilleja subinclusa ssp. franciscana (Pennell) T.I. Chuang & Heckard -- accepted -- longleaf Indian paintbrush
  Castilleja subinclusa ssp. subinclusa Greene -- accepted -- longleaf Indian paintbrush
  Castilleja subinclusa var. franciscana (Pennell) G.L. Nesom -- not accepted
  Castilleja suksdorfii A. Gray -- accepted -- Suksdorf's Indian paintbrush
  Castilleja sulphurea Rydb. -- accepted -- sulphur Indian paintbrush
  Castilleja taedifera Pennell -- not accepted
  Castilleja tenuiflora Benth. -- accepted -- Santa Catalina Indian paintbrush, Catalina Indian paintbrush
  Castilleja tenuis (A. Heller) T.I. Chuang & Heckard -- accepted -- hairy Indian paintbrush, slender paintbrush
  Castilleja thompsonii Pennell -- accepted -- Thompson's Indian paintbrush
  Castilleja tortifolia Pennell -- not accepted
  Castilleja trainii Edwin -- not accepted
  Castilleja uliginosa Eastw. -- not accepted -- Pitkin Marsh paintbrush
  Castilleja unalaschcensis (Cham. & Schltdl.) Malte -- accepted -- Alaska Indian paintbrush
  Castilleja villicaulis Pennell & Ownbey -- not accepted
  Castilleja villosissima Pennell -- not accepted
  Castilleja viscida Rydb. -- not accepted
  Castilleja viscidula A. Gray -- accepted -- sticky Indian paintbrush, sticky paintbrush
  Castilleja wallowensis Pennell -- accepted -- Wallowa Indian paintbrush
  Castilleja wherryana Pennell -- not accepted
  Castilleja wightii Elmer -- not accepted
  Castilleja wightii ssp. anacapensis (Dunkle) Pennell -- not accepted
  Castilleja wightii ssp. inflata (Pennell) Munz -- not accepted
  Castilleja wightii ssp. litoralis (Pennell) Munz -- not accepted
  Castilleja wightii ssp. rubra Pennell -- not accepted
  Castilleja wightii ssp. wightii Elmer -- not accepted -- Wight's Indian paintbrush
  Castilleja williamsii Pennell -- not accepted
  Castilleja wootonii Standl. -- accepted -- Sacramento Mountain Indian paintbrush
  Castilleja X porterae Cockerell -- accepted -- Porter's Indian paintbrush
  Castilleja xanthotricha Pennell -- accepted -- yellowhair Indian paintbrush
  Castilleja yukonis Pennell -- accepted -- Yukon Indian paintbrush
  Castilleja zionis Eastw. -- not accepted
  Catalpa Scop. -- accepted
  Catalpa bignonioides Walter -- accepted -- southern catalpa
  Catalpa bungei C.A. Mey. -- accepted
  Catalpa catalpa (L.) H. Karst. -- not accepted
  Catalpa fargesii Bureau -- accepted
  Catalpa longissima (Jacq.) Dum. Cours. -- accepted -- Haitian catalpa
  Catalpa ovata G. Don -- accepted -- Chinese catalpa
  Catalpa speciosa (Warder) Warder ex Engelm. -- accepted -- northern catalpa
  Cedronella Moench -- accepted
  Cedronella canariensis (L.) Willd. ex Webb & Berthel. -- accepted -- herb of Gilead
  Cedronella micrantha A. Gray -- not accepted
  Ceranthera densiflora (Benth.) A. Gray -- not accepted
  Ceranthera linearifolia Elliott -- not accepted
  Ceratophytum Pittier -- accepted
  Ceratophytum brachycarpum Pittier -- not accepted
  Ceratophytum tobagense (Urb.) Sprague & Sandwith -- accepted
  Ceratotheca Endl. -- accepted
  Ceratotheca sesamoides Endl. -- accepted -- false sesame
  Ceratotheca triloba (Bernh.) E. Mey. ex Hook. f. -- accepted -- wild foxglove
  Chaenarrhinum (DC.) Rchb. -- not accepted
  Chaenarrhinum minus (L.) Lange -- not accepted
  Chaenorhinum (DC.) Rchb. -- accepted -- dwarf snapdragon
  Chaenorhinum calycinum (Banks & Sol.) P.H. Davis -- accepted
  Chaenorhinum minus (L.) Lange -- accepted -- dwarf-snapdragon, dwarf snapdragon
  Chaenorhinum minus ssp. minus (L.) Lange -- accepted -- dwarf snapdragon
  Chaenorrhinum (DC.) Rchb. -- not accepted
  Chaiturus Willd. -- accepted -- lion's tail
  Chaiturus marrubiastrum (L.) Rchb. -- accepted -- lion's tail
  Chelone L. -- accepted -- turtlehead
  Chelone chlorantha Pennell & Wherry -- not accepted
  Chelone cuthbertii Small -- accepted -- Cuthbert's turtlehead
  Chelone glabra L. -- accepted -- white turtlehead
  Chelone glabra var. chlorantha (Pennell & Wherry) Cooperr. -- not accepted
  Chelone glabra var. dilatata Fernald & Wiegand -- not accepted
  Chelone glabra var. elatior Raf. -- not accepted
  Chelone glabra var. elongata Pennell & Wherry -- not accepted
  Chelone glabra var. glabra L. -- not accepted -- white turtlehead
  Chelone glabra var. linifolia N. Coleman -- not accepted
  Chelone glabra var. ochroleuca Pennell & Wherry -- not accepted
  Chelone glabra var. typica Pennell -- not accepted
  Chelone grimesii Weath. -- not accepted
  Chelone lyonii Pursh -- accepted -- pink turtlehead
  Chelone montana (Raf.) Pennell & Wherry -- not accepted
  Chelone obliqua L. -- accepted -- red turtlehead
  Chelone obliqua var. erwiniae Pennell & Wherry -- accepted -- Erwin's red turtlehead
  Chelone obliqua var. obliqua L. -- accepted -- red turtlehead
  Chelone obliqua var. speciosa Pennell & Wherry -- accepted -- red turtlehead
  Chilianthus oleaceus Burch. -- not accepted
  Chilopsis D. Don -- accepted -- desert willow
  Chilopsis linearis (Cav.) Sweet -- accepted -- desert willow
  Chilopsis linearis ssp. arcuata (Fosberg) Henrickson -- accepted -- hairy clematis, desert willow
  Chilopsis linearis ssp. linearis (Cav.) Sweet -- accepted -- desert willow
  Chilopsis linearis var. arcuata Fosberg -- not accepted
  Chilopsis linearis var. glutinosa (Engelm.) Fosberg -- not accepted
  Chilopsis linearis var. originaria Fosberg -- not accepted
  Chionanthus L. -- accepted -- fringetree
  Chionanthus axilliflorus (Griseb.) Stearn -- accepted -- hueso
  Chionanthus caribaeus Jacq. -- not accepted
  Chionanthus compactus Sw. -- accepted -- bridgotree
  Chionanthus domingensis Lam. -- accepted -- white rosewood
  Chionanthus holdridgei (Camp & Monach.) Stearn -- accepted -- hueso prieto
  Chionanthus ligustrinus (Sw.) Pers. -- accepted -- cabra blanca
  Chionanthus pygmaeus Small -- accepted -- pygmy fringe-tree, pygmy fringetree
  Chionanthus virginicus L. -- accepted -- fringetree, white fringetree
  Chionanthus virginicus var. maritimus Pursh -- not accepted -- white fringetree
  Chionanthus virginicus var. virginicus L. -- not accepted -- white fringetree
  Chionophila Benth. -- accepted -- snowlover
  Chionophila jamesii Benth. -- accepted -- Rocky Mountain snowlover
  Chionophila tweedyi (Canby & Rose) L.F. Hend. -- accepted -- Tweedy's snowlover
  Chloropyron Behr -- accepted
  Chloropyron maritimum (Nutt. ex Benth.) A. Heller -- accepted -- saltmarsh bird's-beak
  Chloropyron maritimum ssp. canescens (A. Gray) Tank & J.M. Egger -- accepted -- Pt. Reyes bird's-beak
  Chloropyron maritimum ssp. maritimus Nutt. ex Benth. -- accepted -- saltmarsh bird's-beak
  Chloropyron maritimum ssp. palustre (Behr) Tank & J.M. Egger -- accepted -- Pt. Reyes bird's-beak
  Chloropyron molle (A. Gray) A. Heller -- accepted -- soft bird's-beak
  Chloropyron molle ssp. hispidum (Pennell) Tank & J.M. Egger -- accepted -- hispid bird's-beak
  Chloropyron molle ssp. molle (A. Gray) A. Heller -- accepted -- soft bird's-beak
  Chloropyron palmatum (Ferris) Tank & J.M. Egger -- accepted -- palmbract bird's-beak
  Chloropyron tecopense (Munz & J.C. Roos) Tank & J.M. Egger -- accepted -- Tecopa bird's beak
  Chrysothemis Decne. -- accepted
  Chrysothemis pulchella (Donn ex Sims) Decne. -- accepted -- squarestem
  Citharexylum L. -- accepted -- fiddlewood
  Citharexylum berlandieri B.L. Rob. -- accepted -- Berlandier's fiddlewood
  Citharexylum brachyanthum (A. Gray) A. Gray -- accepted -- Mexican fiddlewood, boxthorn fiddlewood
  Citharexylum caudatum L. -- accepted -- juniper berry
  Citharexylum fruticosum L. -- not accepted -- Florida fiddlewood
  Citharexylum fruticosum var. fruticosum L. -- not accepted -- Florida fiddlewood
  Citharexylum fruticosum var. smallii Moldenke -- not accepted -- Small's fiddlewood
  Citharexylum fruticosum var. subvillosum Moldenke -- not accepted
  Citharexylum fruticosum var. villosum (Jacq.) O.E. Schulz -- not accepted -- Florida fiddlewood
  Citharexylum pentandrum Vent. -- not accepted -- West Indian fiddlewood
  Citharexylum spathulatum Moldenke & Lundell -- not accepted
  Citharexylum spinosum L. -- accepted -- fiddlewood, spiny fiddlewood
  Citharexylum tristachyum Turcz. -- accepted -- threespike fiddlewood
  Citharexylum X perkinsii Moldenke -- accepted -- Perkins' fiddlewood
  Clerodendrum L. -- accepted -- glorybower
  Clerodendrum aculeatum (L.) Schltdl. -- not accepted -- haggarbush
  Clerodendrum buchananii (Roxb.) Walp. -- accepted
  Clerodendrum buchananii var. fallax (Lindl.) Bakh. -- accepted
  Clerodendrum bungei Steud. -- accepted -- strong-scented glorybower, rose glorybower
  Clerodendrum chinense (Osbeck) Mabb. -- accepted -- stickbush
  Clerodendrum foetidum Bunge -- not accepted
  Clerodendrum fragrans (Vent.) Willd. -- not accepted
  Clerodendrum fragrans var. multiplex (Sweet) Moldenke -- not accepted
  Clerodendrum glabrum E. Mey. -- accepted -- Natal glorybower
  Clerodendrum indicum (L.) Kuntze -- accepted -- Turk's turban
  Clerodendrum inerme (L.) Gaertn. -- not accepted -- embrert
  Clerodendrum japonicum (Thunb.) Sweet -- accepted -- Japanese glorybower
  Clerodendrum japonicum var. pleniflorum (Schauer) Maheshw. -- not accepted
  Clerodendrum kaempferi (Jacq.) Siebold -- not accepted -- Kaempfer's glorybower
  Clerodendrum lindleyi Decne. -- accepted -- Lindley's clerodendrum
  Clerodendrum lindleyi var. paniculatum Moldenke -- accepted -- Lindley's clerodendrum
  Clerodendrum macrostegium Schauer -- accepted -- velvetleaf glorybower
  Clerodendrum philippinum Schauer -- not accepted -- stickbush
  Clerodendrum quadriloculare (Blanco) Merr. -- accepted
  Clerodendrum speciosissimum Van Geert ex C. Morren -- accepted -- Javanese glorybower
  Clerodendrum squamatum Vahl -- not accepted
  Clerodendrum thompsoniae Balf. f. -- not accepted -- bagflower
  Clerodendrum thomsoniae Balf. -- accepted -- bagflower
  Clerodendrum trichotomum Thunb. -- accepted -- harlequin glorybower
  Clerodendrum trichotomum var. ferrugineum Nakai -- accepted -- ferruginous clerodendrum
  Clerodendrum trichotomum var. trichotomum Thunb. -- accepted
  Clerodendrum umbellatum Poir. -- accepted -- umbel clerodendrum
  Clerodendrum wallichii Merr. -- accepted -- Wallich's glorybower
  Clerodendrum X speciosum Dombrain -- accepted
  Clinopodium L. -- accepted
  Clinopodium acinos (L.) Kuntze -- accepted
  Clinopodium arkansanum (Nutt.) House -- not accepted -- limestone calamint
  Clinopodium ascendens (Jord.) Samp. -- not accepted -- ascending wild basil
  Clinopodium ashei (Weath.) Small -- accepted -- Ashe's calamint
  Clinopodium brownei (Sw.) Kuntze -- accepted -- Browne's savory
  Clinopodium chandleri (Brandegee) P.D. Cantino & Wagstaff -- accepted -- San Miguel calamint
  Clinopodium coccineum (Nutt. ex Hook.) Kuntze -- accepted -- scarlet calamint
  Clinopodium dentatum (Chapm.) Kuntze -- accepted -- Florida calamint
  Clinopodium douglasii (Benth.) Kuntze -- not accepted -- yerba buena
  Clinopodium georgianum R.M. Harper -- not accepted -- Georgia calamint
  Clinopodium glabellum (Michx.) Kuntze -- accepted -- Ozark calamint
  Clinopodium glabrum (Nutt.) Kuntze -- accepted -- limestone calamint
  Clinopodium gracile (Benth.) Kuntze -- accepted -- slender wild basil
  Clinopodium incanum L. -- not accepted
  Clinopodium macrocalyx Small -- not accepted
  Clinopodium mimuloides (Benth.) Kuntze -- accepted -- monkeyflower savory
  Clinopodium nepeta (L.) Kuntze -- accepted -- lesser calamint
  Clinopodium vimineum (L.) Kuntze -- accepted -- serpentine savory
  Clinopodium vulgare L. -- accepted -- wild basil
  Clinopodium vulgare var. neogaea (Fernald) C.F. Reed -- not accepted
  Coleus Lour. -- accepted
  Coleus amboinicus Lour. -- not accepted
  Coleus barbatus (Andrews) Benth. -- not accepted -- coleus
  Coleus blumei Benth. -- not accepted
  Coleus esculentus (N.E. Br.) G. Taylor -- not accepted
  Coleus parviflorus Benth. -- not accepted
  Coleus pumilus Blanco -- not accepted -- dwarf coleus
  Coleus rotundifolius (Poir.) A. Chev. & Perrot -- not accepted
  Coleus scutellarioides (L.) Benth. -- not accepted -- common coleus
  Coleus tuberosus (Blume) Benth. -- not accepted
  Collinsia Nutt. -- accepted -- blue-eyed Mary, blue eyed Mary
  Collinsia antonina Hardham -- not accepted
  Collinsia antonina ssp. purpurea Hardham -- not accepted
  Collinsia austromontana (Newsom) Pennell -- not accepted
  Collinsia bartsiifolia Benth. -- accepted -- white blue eyed Mary
  Collinsia bartsiifolia var. bartsiifolia Benth. -- accepted -- white blue eyed Mary
  Collinsia bartsiifolia var. davidsonii (Parish) Newsom -- accepted -- Davidson's blue eyed Mary
  Collinsia bartsiifolia var. hirsuta (Kellogg) Pennell -- accepted -- white blue eyed Mary
  Collinsia bartsiifolia var. stricta Newsom -- accepted -- white blue eyed Mary
  Collinsia bruceae M.E. Jones -- not accepted
  Collinsia callosa Parish -- accepted -- largefruit blue-eyed Mary, desertmountain blue eyed Mary
  Collinsia childii Parry ex A. Gray -- accepted -- Child's blue eyed Mary
  Collinsia concolor Greene -- accepted -- Chinese houses
  Collinsia corymbosa Herder -- accepted -- roundhead Chinese houses
  Collinsia franciscana Bioletti -- not accepted
  Collinsia grandiflora Douglas ex Lindl. -- accepted -- giant blue eyed Mary
  Collinsia grandiflora var. pusilla A. Gray -- not accepted
  Collinsia greenei A. Gray -- accepted -- Greene's blue eyed Mary
  Collinsia heterophylla Buist ex R. Grah. -- accepted -- purple Chinese houses
  Collinsia heterophylla var. austromontana (Newsom) Munz -- accepted -- purple Chinese houses
  Collinsia heterophylla var. heterophylla Buist ex R. Grah. -- accepted -- purple Chinese houses
  Collinsia linearis A. Gray -- accepted -- narrowleaf blue eyed Mary
  Collinsia multicolor Lindl. & Paxton -- accepted -- San Francisco blue eyed Mary
  Collinsia parryi A. Gray -- accepted -- Parry's blue eyed Mary
  Collinsia parviflora Lindl. -- accepted -- littleflower collinsia, small-flower blue-eyed Mary, blue-eyed Mary, smallflower blue eyed Mary, maiden blue eyed Mary
  Collinsia parviflora var. grandiflora (Lindl.) Ganders & G.R. Krause -- not accepted
  Collinsia parviflora var. parviflora Lindl. -- not accepted -- smallflower blue eyed Mary
  Collinsia parvula Rydb. -- not accepted
  Collinsia rattanii A. Gray -- accepted -- sticky blue eyed Mary
  Collinsia rattanii ssp. glandulosa (Howell) Pennell -- accepted -- sticky blue eyed Mary
  Collinsia rattanii ssp. rattanii A. Gray -- accepted -- sticky blue eyed Mary
  Collinsia rattanii var. linearis (A. Gray) Newsom -- not accepted
  Collinsia solitaria Kellogg -- not accepted
  Collinsia sparsiflora Fisch. & C.A. Mey. -- accepted -- spinster's blue eyed Mary
  Collinsia sparsiflora var. arvensis (Greene) Jeps. -- accepted -- spinster's blue eyed Mary
  Collinsia sparsiflora var. bruceae (M.E. Jones) Newsom -- accepted -- spinster's blue eyed Mary
  Collinsia sparsiflora var. collina (Jeps.) Newsom -- accepted -- spinster's blue eyed Mary
  Collinsia sparsiflora var. sparsiflora Fisch. & C.A. Mey. -- accepted -- spinster's blue eyed Mary
  Collinsia tenella (Pursh) Piper -- not accepted
  Collinsia tinctoria Hartw. ex Benth. -- accepted -- sticky Chinese houses
  Collinsia torreyi A. Gray -- accepted -- Torrey's blue-eyed Mary, Torrey's blue eyed Mary
  Collinsia torreyi var. brevicarinata Newsom -- accepted -- Torrey's blue eyed Mary
  Collinsia torreyi var. latifolia Newsom -- accepted -- Torrey's blue eyed Mary
  Collinsia torreyi var. torreyi A. Gray -- accepted -- Torrey's blue eyed Mary, Torrey's blue-eyed Mary
  Collinsia torreyi var. wrightii (S. Watson) I.M. Johnst. -- accepted -- Wright's blue eyed Mary
  Collinsia verna Nutt. -- accepted -- blue-eyed Mary, spring blue eyed Mary
  Collinsia violacea Nutt. -- accepted -- violet collensia, violet blue eyed Mary
  Collinsia wrightii S. Watson -- not accepted
  Collinsonia L. -- accepted -- horsebalm
  Collinsonia anisata Sims -- accepted -- Blue Ridge horsebalm
  Collinsonia canadensis L. -- accepted -- richweed
  Collinsonia canadensis var. punctata (Elliott) A. Gray -- not accepted
  Collinsonia punctata Elliott -- accepted -- Blue Ridge horsebalm
  Collinsonia serotina Walter -- not accepted -- Blue Ridge horsebalm
  Collinsonia tuberosa Michx. -- not accepted -- deepwoods horsebalm
  Collinsonia verticillata Baldw. -- accepted -- stoneroot
  Columnea L. -- accepted
  Columnea ambigua (Urb.) B.D. Morley -- accepted -- tibey de cresta
  Columnea scandens L. -- accepted -- tibey parasito
  Columnea scandens var. tulae (Urb.) Wiehler -- accepted -- tibey parasito
  Columnea tulae Urb. -- not accepted -- tibey parasito
  Congea Roxb. -- accepted
  Congea tomentosa Roxb. -- accepted -- lluvia de orquideas
  Conobea multifida (Michx.) Benth. -- not accepted
  Conopholis Wallr. -- accepted -- cancer-root, squawroot
  Conopholis alpina Liebm. -- accepted -- alpine squawroot, alpine cancer-root
  Conopholis alpina var. mexicana (A. Gray ex S. Watson) R.R. Haynes -- accepted -- Mexican squawroot, alpine squawroot, Mexican cancer-root
  Conopholis americana (L.) Wallr. -- accepted -- American squawroot, squaw-root, conopholis d'Amérique, American cancer-root
  Conopholis ludoviciana (Nutt.) Alph. Wood -- not accepted
  Conopholis mexicana A. Gray ex S. Watson -- not accepted
  Conradina A. Gray -- accepted -- false rosemary
  Conradina brevifolia Shinners -- not accepted -- short-leaved rosemary
  Conradina canescens (Torr. & A. Gray ex Benth.) A. Gray -- accepted -- false rosemary
  Conradina cygniflora C.E. Edwards, Judd, Ionta & Herring -- accepted
  Conradina etonia Kral & McCartney -- accepted -- Etonia rosemary, Eton rosemary
  Conradina glabra Shinners -- accepted -- Cumberland rosemary, Apalachicola rosemary, Apalachicola false rosemary
  Conradina grandiflora Small -- accepted -- largeflower false rosemary
  Conradina montana Small -- not accepted
  Conradina puberula Small -- not accepted
  Conradina verticillata Jennison -- accepted -- Cumberland rosemary, Cumberland false rosemary
  Cordylanthus Nutt. ex Benth. -- accepted -- bird's beak, bird's-beak
  Cordylanthus bernardinus Munz -- not accepted
  Cordylanthus bolanderi (A. Gray) Pennell -- not accepted
  Cordylanthus brunneus (Jeps.) Pennell -- not accepted
  Cordylanthus canescens A. Gray -- not accepted
  Cordylanthus capillaris Pennell -- not accepted
  Cordylanthus capitatus Nutt. ex Benth. -- accepted -- Yakima bird's-beak, cluster bird'sbeak
  Cordylanthus carnulosus Pennell -- not accepted
  Cordylanthus compactus Pennell -- not accepted
  Cordylanthus diffusus Pennell -- not accepted
  Cordylanthus eremicus (Coville & C.V. Morton) Munz -- accepted -- desert bird's-beak
  Cordylanthus eremicus ssp. eremicus (Coville & C.V. Morton) Munz -- accepted -- desert bird's-beak
  Cordylanthus eremicus ssp. kernensis T.I. Chuang & Heckard -- accepted -- Kern Plateau bird's-beak
  Cordylanthus ferrisianus Pennell -- not accepted
  Cordylanthus filifolius Nutt. ex Benth. -- not accepted
  Cordylanthus glandulosus Pennell & Clokey -- not accepted
  Cordylanthus hansenii (Ferris) J.F. Macbr. -- not accepted
  Cordylanthus helleri (Ferris) J.F. Macbr. -- not accepted
  Cordylanthus hispidus Pennell -- not accepted
  Cordylanthus kingii S. Watson -- accepted -- King's bird'sbeak, King's bird's-beak
  Cordylanthus kingii ssp. densiflorus T.I. Chuang & Heckard -- accepted -- King's bird's-beak
  Cordylanthus kingii ssp. helleri (Ferris) T.I. Chuang & Heckard -- accepted -- Heller's bird's beak, Heller's bird's-beak
  Cordylanthus kingii ssp. kingii S. Watson -- accepted -- King's bird'sbeak, King's bird's-beak
  Cordylanthus kingii var. densiflorus (T.I. Chuang & Heckard) N.D. Atwood -- not accepted
  Cordylanthus kingii var. helleri (Ferris) N.H. Holmgren -- not accepted
  Cordylanthus laxiflorus A. Gray -- accepted -- nodding bird's-beak, nodding bird's beak
  Cordylanthus littoralis (Ferris) J.F. Macbr. -- not accepted
  Cordylanthus littoralis ssp. platycephalus (Pennell) Munz -- not accepted
  Cordylanthus maritimus Nutt. ex Benth. -- not accepted -- saltmarsh bird'sbeak, saltmarsh bird's-beak
  Cordylanthus maritimus ssp. canescens (A. Gray) T.I. Chuang & Heckard -- not accepted -- saltmarsh bird'sbeak, saltmarsh bird's-beak
  Cordylanthus maritimus ssp. maritimus Nutt. ex Benth. -- not accepted -- salt marsh bird's beak, salt marsh bird's-beak
  Cordylanthus maritimus ssp. palustris (Behr) T.I. Chuang & Heckard -- not accepted -- Pt. Reyes bird's-beak, northcoast bird's-beak
  Cordylanthus maritimus var. canescens (A. Gray) Jeps. -- not accepted
  Cordylanthus mollis A. Gray -- not accepted -- soft bird's-beak
  Cordylanthus mollis ssp. hispidus (Pennell) T.I. Chuang & Heckard -- not accepted -- hispid bird's-beak
  Cordylanthus mollis ssp. mollis A. Gray -- not accepted -- soft bird's-beak
  Cordylanthus nevadensis Edwin -- not accepted
  Cordylanthus nevinii A. Gray -- accepted -- Nevin's bird's-beak
  Cordylanthus nidularius J.T. Howell -- accepted -- Mount Diablo bird's-beak
  Cordylanthus orcuttianus A. Gray -- not accepted -- Orcutt's bird's-beak
  Cordylanthus pallescens Pennell -- not accepted
  Cordylanthus palmatus (Ferris) J.F. Macbr. -- not accepted -- palmate-bracted bird's beak, palmbract bird's-beak
  Cordylanthus palmatus ssp. carnulosus (Pennell) Munz -- not accepted
  Cordylanthus parviflorus (Ferris) Wiggins -- accepted -- purple bird'sbeak, purple bird's-beak
  Cordylanthus pilosus A. Gray -- accepted -- hairy bird's-beak
  Cordylanthus pilosus ssp. bolanderi (A. Gray) Munz -- not accepted
  Cordylanthus pilosus ssp. diffusus (Pennell) Munz -- not accepted
  Cordylanthus pilosus ssp. hansenii (Ferris) T.I. Chuang & Heckard -- accepted -- Hansen's bird's beak
  Cordylanthus pilosus ssp. pilosus A. Gray -- accepted -- hairy bird's beak
  Cordylanthus pilosus ssp. trifidus (B.L. Rob. & Greenm.) T.I. Chuang & Heckard -- accepted -- hairy bird's beak
  Cordylanthus pilosus var. trifidus B.L. Rob. & Greenm. -- not accepted
  Cordylanthus platycephalus Pennell -- not accepted
  Cordylanthus pringlei A. Gray -- accepted -- Pringle's bird's beak
  Cordylanthus ramosus Nutt. ex Benth. -- accepted -- bushy bird's beak, bushy birdbeak, muchbranched bird'sbeak
  Cordylanthus ramosus ssp. eremicus (Coville & C.V. Morton) Munz -- not accepted
  Cordylanthus ramosus ssp. setosus Pennell -- not accepted
  Cordylanthus ramosus var. puberulus J.F. Macbr. -- not accepted
  Cordylanthus rigidus (Benth.) Jeps. -- accepted -- stiffbranch bird's beak
  Cordylanthus rigidus ssp. brevibracteatus (A. Gray) Munz -- accepted -- stiffbranch bird's beak
  Cordylanthus rigidus ssp. littoralis (Ferris) T.I. Chuang & Heckard -- accepted -- seaside bird's-beak
  Cordylanthus rigidus ssp. rigidus (Benth.) Jeps. -- accepted -- stiffbranch bird's beak
  Cordylanthus rigidus ssp. setigerus T.I. Chuang & Heckard -- accepted -- stiffbranch bird's beak
  Cordylanthus rigidus var. littoralis (Ferris) Jeps. -- not accepted
  Cordylanthus tecopensis Munz & J.C. Roos -- not accepted -- Tecopa bird's-beak, Tecopa bird's beak
  Cordylanthus tenuifolius Pennell -- not accepted
  Cordylanthus tenuis A. Gray -- accepted -- slender bird'sbeak, slender bird's beak
  Cordylanthus tenuis ssp. barbatus T.I. Chuang & Heckard -- accepted -- Fresno County bird's-beak
  Cordylanthus tenuis ssp. brunneus (Jeps.) Munz -- accepted -- serpentine bird's beak
  Cordylanthus tenuis ssp. capillaris (Pennell) T.I. Chuang & Heckard -- accepted -- Pennell's bird's-beak, Pennell's bird's beak
  Cordylanthus tenuis ssp. pallescens (Pennell) T.I. Chuang & Heckard -- accepted -- pallid bird's-beak
  Cordylanthus tenuis ssp. tenuis A. Gray -- accepted -- slender bird'sbeak, slender bird's beak
  Cordylanthus tenuis ssp. viscidus (Howell) T.I. Chuang & Heckard -- accepted -- slender bird's beak
  Cordylanthus viscidus (Howell) Pennell ex M. Peck -- not accepted
  Cordylanthus wrightii A. Gray -- accepted -- Wright's bird's-beak, Wright's bird's beak
  Cordylanthus wrightii ssp. kaibabensis T.I. Chuang & Heckard -- accepted -- Kaibab bird's beak
  Cordylanthus wrightii ssp. tenuifolius (Pennell) T.I. Chuang & Heckard -- accepted -- Wright's bird's-beak, Wright's bird's beak
  Cordylanthus wrightii ssp. wrightii A. Gray -- accepted -- Wright's bird's-beak, Wright's bird's beak
  Cordylanthus wrightii var. pauciflorus Kearney & Peebles -- not accepted
  Cornutia L. -- accepted
  Cornutia grandiflora Steud. -- not accepted -- Mexican-blue
  Cornutia grandifolia (Schltdl. & Cham.) Schauer -- not accepted
  Cornutia obovata Urb. -- accepted -- palo de nigua, capá jigüerilla, nigua
  Cornutia pyramidata L. -- accepted -- azulejo
  Craniolaria L. -- accepted
  Craniolaria annua L. -- accepted -- escorzonera
  Crantzia ambigua (Urb.) Britton -- not accepted
  Craterostigma Hochst. -- accepted
  Craterostigma plantagineum Hochst. -- accepted -- blue gem
  Craterostigma pumilum Hochst. -- accepted
  Crescentia L. -- accepted
  Crescentia alata Kunth -- accepted -- morrito
  Crescentia cujete L. -- accepted -- common calabash tree
  Crescentia latifolia Mill. -- not accepted
  Crescentia linearifolia Miers -- accepted -- higuerito
  Crescentia portoricensis Britton -- accepted -- calabash tree, higuero de sierra
  Croftia parvifolia (Torr.) Small -- not accepted
  Crossandra Salisb. -- accepted
  Crossandra fascicularis auct. non Benth. -- not accepted
  Crossandra infundibuliformis (L.) Nees -- accepted
  Crossandra nilotica Oliv. -- accepted
  Cunila D. Royen ex L. -- accepted
  Cunila coccinea Nutt. ex Hook. -- not accepted
  Cunila glabella Michx. -- not accepted
  Cunila mariana L. -- not accepted
  Cunila origanoides (L.) Britton -- accepted -- common dittany
  Cunila pulegioides L. -- not accepted
  Cybistax donnell-smithii (Rose) Seibert -- not accepted
  Cycnium E. Mey. ex Benth. -- accepted
  Cycnium tubulosum (L. f.) Engl. -- accepted
  Cycnium tubulosum ssp. montanum (N.E. Br.) O.J. Hansen -- not accepted
  Cydista Miers -- accepted -- withe
  Cydista aequinoctialis (L.) Miers -- accepted -- guard withe
  Cydista diversifolia (Kunth) Miers -- accepted
  Cymbalaria Hill -- accepted
  Cymbalaria muralis G. Gaertn., B. Mey. & Scherb. -- accepted -- Kenilworth ivy
  Cymburus urticifolius sensu Salisb. -- not accepted
  Cyrtandra J.R. Forst. & G. Forst. -- accepted
  Cyrtandra adpressipilosa H. St. John -- not accepted
  Cyrtandra arcuata H. St. John -- not accepted
  Cyrtandra arguta (A. Gray) C.B. Clarke -- not accepted
  Cyrtandra baccifera C.B. Clarke -- not accepted
  Cyrtandra begoniifolia Hillebr. -- not accepted
  Cyrtandra biserrata Hillebr. -- accepted -- Molokai cyrtandra
  Cyrtandra brevicalyx (Hillebr.) H. St. John -- not accepted
  Cyrtandra brevicornuta H. St. John -- not accepted
  Cyrtandra bryanii H. St. John & Storey -- not accepted
  Cyrtandra calpidicarpa (Rock) H. St. John & Storey -- accepted -- valley cyrtandra
  Cyrtandra calycoschiza (H. St. John & Storey) H. St. John -- not accepted
  Cyrtandra campaniformis H. St. John -- not accepted
  Cyrtandra charadraia H. St. John -- not accepted
  Cyrtandra chartacea H. St. John & Storey -- not accepted
  Cyrtandra collarifera H. St. John & Storey -- not accepted
  Cyrtandra confertiflora (Wawra) C.B. Clarke -- accepted -- lava cyrtandra
  Cyrtandra confertiflora var. confertiflora (Wawra) C.B. Clarke -- accepted -- lava cyrtandra
  Cyrtandra confertiflora var. obovata (Wawra) C.B. Clarke -- not accepted -- lava cyrtandra
  Cyrtandra cordifolia Gaudich. -- accepted -- heartleaf cyrtandra
  Cyrtandra cordifolia var. brevipilita H. St. John -- not accepted
  Cyrtandra cordifolia var. gynoglabra Rock -- not accepted
  Cyrtandra cornuta H. St. John -- not accepted
  Cyrtandra crenata H. St. John & Storey -- accepted -- ha`iwale, Kahana Valley cyrtandra
  Cyrtandra cyaneoides Rock -- accepted -- mapele
  Cyrtandra degenerans (Wawra) A. Heller -- not accepted
  Cyrtandra dentata H. St. John & Storey -- accepted -- ha`iwale, mountain cyrtandra
  Cyrtandra ellipticifolia H. St. John -- not accepted
  Cyrtandra elliptisepala H. St. John -- not accepted
  Cyrtandra elstonii Hochr. -- not accepted
  Cyrtandra ferripilosa H. St. John -- accepted -- red-hair cyrtandra
  Cyrtandra filipes Hillebr. -- accepted -- gulch cyrtandra, ha'iwale
  Cyrtandra fosbergii H. St. John & Storey -- not accepted
  Cyrtandra frederickii H. St. John & Storey -- not accepted
  Cyrtandra fusiformis H. St. John & Storey -- not accepted
  Cyrtandra garberi H. St. John -- not accepted
  Cyrtandra garnotiana Gaudich. -- accepted -- hahala
  Cyrtandra gayana A. Heller -- not accepted
  Cyrtandra gayana var. macrocarpa Skottsb. -- not accepted
  Cyrtandra giffardii Rock -- accepted -- ha`iwale, forest cyrtandra
  Cyrtandra glauca Drake -- not accepted
  Cyrtandra gracilis Hillebr. ex C.B. Clarke -- accepted -- Palolo Valley cyrtandra
  Cyrtandra grandiflora Gaudich. -- accepted -- largeflower cyrtandra
  Cyrtandra grayana Hillebr. -- accepted -- Pacific cyrtandra
  Cyrtandra grayana var. lanaiensis Hillebr. -- not accepted
  Cyrtandra grayana var. latifolia Hillebr. -- not accepted
  Cyrtandra grayana var. linearifolia Rock -- not accepted
  Cyrtandra grayana var. nervosa Rock -- not accepted
  Cyrtandra grayi C.B. Clarke -- accepted -- Gray's cyrtandra
  Cyrtandra grossecrenata H. St. John & Storey -- not accepted
  Cyrtandra halawensis Rock -- accepted -- toothleaf cyrtandra
  Cyrtandra hashimotoi Rock -- accepted -- Maui cyrtandra
  Cyrtandra hawaiensis C.B. Clarke -- accepted -- Hawai'i cyrtandra
  Cyrtandra heinrichii H. St. John -- accepted -- lava cyrtandra
  Cyrtandra hematos H. St. John -- accepted -- singleflower cyrtandra
  Cyrtandra hii C.N. Forbes -- not accepted
  Cyrtandra hirsutula H. St. John & Storey -- not accepted
  Cyrtandra hobdyi H. St. John -- not accepted
  Cyrtandra hyperdasa H. St. John -- not accepted
  Cyrtandra infrapallida H. St. John -- not accepted
  Cyrtandra infundibuliformis H. St. John -- not accepted
  Cyrtandra intonsa H. St. John & Storey -- not accepted
  Cyrtandra intrapilosa H. St. John -- not accepted
  Cyrtandra intravillosa H. St. John & Storey -- not accepted
  Cyrtandra kahukuensis H. St. John & Storey -- not accepted
  Cyrtandra kailuaensis H. St. John -- not accepted
  Cyrtandra kalichii Wawra -- accepted
  Cyrtandra kalihii Wawra -- not accepted -- Koolau Range cyrtandra
  Cyrtandra kaluanuiensis H. St. John -- not accepted
  Cyrtandra kamoolaensis H. St. John -- accepted -- Kamo'oloa cyrtandra
  Cyrtandra kaneoheensis H. St. John -- not accepted
  Cyrtandra kauaiensis Wawra -- accepted -- ulunahele
  Cyrtandra kaulantha H. St. John & Storey -- accepted -- Waikane Valley cyrtandra, haiwale
  Cyrtandra kealiae Wawra -- accepted -- Wahiawa Mountain cyrtandra
  Cyrtandra knudsenii Rock -- not accepted
  Cyrtandra kohalae Rock -- accepted -- Kohala Mountain cyrtandra
  Cyrtandra koolauensis H. St. John & Storey -- not accepted
  Cyrtandra latebrosa Hillebr. -- not accepted
  Cyrtandra latebrosa var. subglabra Hillebr. -- not accepted
  Cyrtandra laxiflora H. Mann -- accepted -- Oahu cyrtandra
  Cyrtandra lessoniana Gaudich. -- accepted -- Lesson's cyrtandra
  Cyrtandra lessoniana var. angustifolia Hillebr. -- not accepted
  Cyrtandra lessoniana var. intrapubens H. St. John -- not accepted
  Cyrtandra lessoniana var. koolauloaensis H. St. John -- not accepted
  Cyrtandra leucocalyx H. St. John -- not accepted
  Cyrtandra limahuliensis H. St. John -- not accepted -- ha`iwale, Limahuli cyrtandra
  Cyrtandra limosiflora Rock -- not accepted
  Cyrtandra linearis H. St. John -- not accepted
  Cyrtandra longicalyx H. St. John -- not accepted
  Cyrtandra longifolia (Wawra) Hillebr. ex C.B. Clarke -- accepted -- longleaf cyrtandra
  Cyrtandra longifolia var. arborescens (Wawra) C.B. Clarke -- not accepted
  Cyrtandra longifolia var. degenerans (Wawra) C.B. Clarke -- not accepted
  Cyrtandra longifolia var. parallela C.B. Clarke -- not accepted
  Cyrtandra longifolia var. wahiawae Rock -- not accepted
  Cyrtandra longiloba H. St. John -- not accepted
  Cyrtandra lydgatei Hillebr. -- accepted -- Lydgate's cyrtandra
  Cyrtandra lysiosepala (A. Gray) C.B. Clarke -- accepted -- oppositeleaf cyrtandra
  Cyrtandra lysiosepala var. fauriei (H. Lév.) Rock -- not accepted
  Cyrtandra lysiosepala var. grayi (C.B. Clarke) Rock -- not accepted
  Cyrtandra lysiosepala var. haleakalensis Rock -- not accepted
  Cyrtandra lysiosepala var. hawaiiensis Skottsb. -- not accepted
  Cyrtandra lysiosepala var. latifolia Rock -- not accepted
  Cyrtandra lysiosepala var. pilosa Hillebr. -- not accepted
  Cyrtandra macraei A. Gray -- accepted -- upland cyrtandra
  Cyrtandra macrantha C.B. Clarke -- accepted
  Cyrtandra macrocalyx Hillebr. -- accepted -- largecalyx cyrtandra
  Cyrtandra malacophylla var. erosa Rock -- not accepted
  Cyrtandra mauiensis Rock -- not accepted
  Cyrtandra mauiensis var. truncata Rock -- not accepted
  Cyrtandra megastigmata H. St. John -- not accepted
  Cyrtandra menziesii Hook. & Arn. -- accepted -- ha`iwale
  Cyrtandra montis-loa Rock -- not accepted
  Cyrtandra munroi C.N. Forbes -- accepted -- ha`iwale, Lanaihale cyrtandra
  Cyrtandra nanawaleensis H. St. John -- accepted
  Cyrtandra niuensis H. St. John -- not accepted
  Cyrtandra nubincolens H. St. John -- not accepted
  Cyrtandra oahuensis H. Lév. -- not accepted
  Cyrtandra oblanceolata H. St. John & Storey -- not accepted
  Cyrtandra oenobarba H. Mann -- accepted -- haiwale, shaggystem cyrtandra
  Cyrtandra oenobarba var. herbacea (Wawra) A. Heller -- not accepted
  Cyrtandra oenobarba var. petiolaris Wawra -- not accepted
  Cyrtandra olivacea H. St. John -- not accepted
  Cyrtandra oliveri Rock -- not accepted
  Cyrtandra olona C.N. Forbes -- accepted -- Kauai cyrtandra
  Cyrtandra oulophylla H. St. John & Storey -- not accepted
  Cyrtandra oxybapha W.L. Wagner & Herbst -- accepted -- Pohakea Gulch cyrtandra, ha'iwale
  Cyrtandra paliku W.L. Wagner, K.R. Wood & Lorence -- accepted -- cliffside cyrtandra, haiwale
  Cyrtandra paloloensis H. St. John & Storey -- not accepted
  Cyrtandra paludosa Gaudich. -- accepted -- kanawao ke`oke`o
  Cyrtandra paludosa var. haupuensis Rock -- not accepted
  Cyrtandra paludosa var. integrifolia Hillebr. -- not accepted
  Cyrtandra paludosa var. irrostrata H. St. John -- not accepted
  Cyrtandra paludosa var. microcarpa Wawra -- accepted -- kanawao ke`oke`o
  Cyrtandra paludosa var. paludosa Gaudich. -- accepted -- kanawao ke`oke`o
  Cyrtandra paludosa var. subherbacea Wawra -- not accepted
  Cyrtandra partita H. St. John -- not accepted
  Cyrtandra pearsallii H. St. John -- not accepted
  Cyrtandra perstaminodica H. St. John -- not accepted
  Cyrtandra pickeringii A. Gray -- accepted -- Pickering's cyrtandra
  Cyrtandra pickeringii var. waiheae Rock -- not accepted
  Cyrtandra piligyna H. St. John & Storey -- not accepted
  Cyrtandra platyphylla A. Gray -- accepted -- `ilihia
  Cyrtandra platyphylla var. brevipes Skottsb. -- not accepted
  Cyrtandra platyphylla var. hiloensis Rock -- not accepted
  Cyrtandra platyphylla var. membranacea Rock -- not accepted
  Cyrtandra platyphylla var. parviflora Rock -- not accepted
  Cyrtandra platyphylla var. robusta Rock -- not accepted
  Cyrtandra platyphylla var. stylopubens Rock -- not accepted
  Cyrtandra plurifolia H. St. John & Storey -- not accepted
  Cyrtandra poamohoensis H. St. John & Storey -- not accepted
  Cyrtandra polyantha C.B. Clarke -- accepted -- ha`iwale, Niu Valley cyrtandra
  Cyrtandra procera Hillebr. -- accepted -- bog cyrtandra
  Cyrtandra propinqua C.N. Forbes -- accepted -- arrowleaf cyrtandra
  Cyrtandra pruinosa H. St. John & Storey -- accepted -- frosted cyrtandra
  Cyrtandra pupukeaensis H. St. John & Storey -- not accepted
  Cyrtandra reflexa H. St. John & Storey -- not accepted
  Cyrtandra rivularis H. St. John & Storey -- accepted -- river cyrtandra
  Cyrtandra rotata H. St. John -- not accepted
  Cyrtandra sandwicensis (H. Lév.) H. St. John & Storey -- accepted -- hairy cyrtandra
  Cyrtandra sessilis H. St. John & Storey -- accepted -- haiwale, windyridge cyrtandra
  Cyrtandra skottsbergii H. St. John & Storey -- not accepted
  Cyrtandra spathulata H. St. John -- accepted -- spoonleaf cyrtandra
  Cyrtandra stupantha H. St. John & Storey -- not accepted
  Cyrtandra subcordata H. St. John -- not accepted
  Cyrtandra suberecta H. St. John -- not accepted
  Cyrtandra subumbellata (Hillebr.) H. St. John & Storey -- accepted -- ha`iwale, parasol cyrtandra
  Cyrtandra subumbellata var. intonsa H. St. John -- not accepted
  Cyrtandra ternata H. St. John -- not accepted
  Cyrtandra tintinnabula Rock -- accepted -- ha`iwale, Laupahoehoe cyrtandra
  Cyrtandra triflora Gaudich. -- not accepted
  Cyrtandra tristis Hillebr. ex C.B. Clarke -- not accepted
  Cyrtandra umbracculiflora Rock -- not accepted
  Cyrtandra vanioti H. Lév. -- not accepted
  Cyrtandra vaniotii H. Lév. -- not accepted
  Cyrtandra villicalyx var. pubentigyna H. St. John & Storey -- not accepted
  Cyrtandra villosa H. St. John & Storey -- not accepted
  Cyrtandra villosiflora H. St. John -- not accepted
  Cyrtandra viridiflora H. St. John & Storey -- accepted -- ha`iwale, greenleaf cyrtandra
  Cyrtandra wagneri Lorence & Perlman -- accepted
  Cyrtandra waianaeensis H. St. John & Storey -- accepted -- Waianaeuka cyrtandra
  Cyrtandra waianuensis Rock -- not accepted
  Cyrtandra wainihaensis H. Lév. -- accepted -- island cyrtandra
  Cyrtandra waiolani Wawra -- accepted -- fuzzyflower cyrtandra, haiwale
  Cyrtandra waiolani var. capitata Hillebr. -- not accepted
  Cyrtandra waiomaoensis H. St. John -- not accepted
  Cyrtandra wawrae C.B. Clarke -- accepted -- rockface cyrtandra
  Cyrtandra wilderi H. St. John & Storey -- not accepted
  Cyrtandra X alata H. St. John & Storey (pro. sp.) -- accepted
  Cyrtandra X alnea H. St. John (pro. sp.) -- accepted
  Cyrtandra X ambigua (Hillebr.) H. St. John & Storey (pro. sp.) -- accepted -- ambiguous cyrtandra
  Cyrtandra X atomigyna H. St. John & Storey (pro. sp.) -- accepted
  Cyrtandra X axilliflora H. St. John & Storey (pro. sp.) -- accepted -- axilflower cyrtandra
  Cyrtandra X basipartita H. St. John (pro. sp.) -- accepted
  Cyrtandra X carinata H. St. John & Storey (pro. sp.) -- accepted
  Cyrtandra X caudatisepala H. St. John (pro. sp.) -- accepted
  Cyrtandra X caulescens Rock (pro. sp.) -- accepted
  Cyrtandra X christophersenii H. St. John & Storey (pro. sp.) -- accepted -- Christophersen's cyrtandra
  Cyrtandra X cladantha Skottsb. (pro. sp.) -- accepted
  Cyrtandra X conradtii Rock (pro. sp.) -- accepted -- Conradt's cyrtandra
  Cyrtandra X crassifolia (Hillebr.) Rock (pro. sp.) -- accepted
  Cyrtandra X crassior H. St. John & Storey (pro. sp.) -- accepted
  Cyrtandra X cupuliformis H. St. John & Storey (pro. sp.) -- accepted
  Cyrtandra X ferrocolorata H. St. John (pro. sp.) -- accepted
  Cyrtandra X ferruginosa H. St. John & Storey (pro. sp.) -- accepted
  Cyrtandra X forbesii H. St. John & Storey -- accepted -- Forbes's cyrtandra
  Cyrtandra X georgiana Forbes (pro. sp.) -- accepted -- Georgia cyrtandra
  Cyrtandra X hillebrandii Oliv. -- accepted -- Hillebrand's cyrtandra
  Cyrtandra X honolulensis Wawra (pro. sp.) -- accepted -- Honolulu cyrtandra
  Cyrtandra X hosakae H. St. John & Storey (pro. sp.) -- accepted -- Hosaka's cyrtandra
  Cyrtandra X kaalae H. St. John & Storey (pro. sp.) -- accepted -- Kaala cyrtandra
  Cyrtandra X kahanaensis H. St. John & Storey (pro. sp.) -- accepted -- Kahana cyrtandra
  Cyrtandra X kipahuluensis H. St. John (pro. sp.) -- accepted -- Kipahulu cyrtandra
  Cyrtandra X kipapaensis H. St. John & Storey (pro. sp.) -- accepted -- Kipapa cyrtandra
  Cyrtandra X laevis H. St. John (pro. sp.) -- accepted
  Cyrtandra X malacophylla C.B. Clarke (pro. sp.) -- accepted
  Cyrtandra X mannii H. St. John & Storey (pro. sp.) -- accepted -- Mann's cyrtandra
  Cyrtandra X nutans H. St. John (pro. sp.) -- accepted
  Cyrtandra X opaeulae H. St. John & Storey (pro. sp.) -- accepted -- opaeula cyrtandra
  Cyrtandra X pubens H. St. John (pro. sp.) -- accepted
  Cyrtandra X ramosissima Rock (pro. sp.) -- accepted
  Cyrtandra X rockii H. St. John & Storey (pro. sp.) -- accepted -- Rock's cyrtandra
  Cyrtandra X scabrella C.B. Clarke (pro. sp.) -- accepted
  Cyrtandra X subintegra H. St. John (pro. sp.) -- accepted
  Cyrtandra X turbiniformis H. St. John & Storey (pro. sp.) -- accepted
  Cyrtandra X umbraculiflora Rock (pro. sp.) -- accepted
  Cyrtandra X villicalyx H. St. John & Storey (pro. sp.) -- accepted
  Cyrtandra X waihoiensis H. St. John -- accepted -- sharp-tooth cyrtandra
  Dasistoma Raf. -- accepted
  Dasistoma calycosa Mack. & Bush -- not accepted
  Dasistoma dispersa Small -- not accepted
  Dasistoma flava (L.) Alph. Wood -- not accepted
  Dasistoma grandiflora (Benth.) Alph. Wood -- not accepted
  Dasistoma laevigata (Raf.) Chapm. -- not accepted
  Dasistoma levigata (Raf.) Chapm. -- not accepted
  Dasistoma macrophylla (Nutt.) Raf. -- accepted -- mullein foxglove, mullein seymeria
  Dasistoma patula Chapm. -- not accepted
  Dasistoma pectinata (Nutt.) Benth. -- not accepted
  Dasistoma pedicularia (L.) Benth. -- not accepted
  Dasistoma serrata (Torr. ex Benth.) Small -- not accepted
  Dasistoma virginica (L.) Britton -- not accepted
  Dendrosicus Raf. -- not accepted
  Dianthera americana L. -- not accepted
  Dianthera americana var. subcoriacea (Fernald) Shinners -- not accepted
  Dianthera androsaemifolia (Nees) Griseb. -- not accepted
  Dianthera angusta (Chapm.) Small -- not accepted
  Dianthera comata L. -- not accepted
  Dianthera crassifolia Chapm. -- not accepted
  Dianthera humilis (Michx.) Engelm. & A. Gray -- not accepted
  Dianthera lanceolata (Chapm.) Small -- not accepted
  Dianthera ovata Walter -- not accepted
  Dianthera ovata var. angusta Chapm. -- not accepted
  Dianthera ovata var. lanceolata Chapm. -- not accepted
  Dianthera parviflora (Buckley) A. Gray -- not accepted
  Dianthera parvifolia (Torr.) A. Gray -- not accepted
  Dianthera pectoralis (Jacq.) Murray -- not accepted
  Dianthera secunda (Vahl) Griesb. -- not accepted
  Diapedium assurgens (L.) Kuntze -- not accepted
  Diapedium brachiatum (Pursh) Kuntze -- not accepted
  Diapedium krugii (Urb.) Britton -- not accepted
  Diapedium resupinatum (Vahl) Kuntze -- not accepted
  Diapedium torreyi (A. Gray) A. Heller -- not accepted
  Dicerandra Benth. -- accepted -- balm
  Dicerandra christmanii Huck & Judd -- not accepted -- Garrett's mint, Lake Wales balm
  Dicerandra cornutissima Huck -- not accepted -- longspurred mint, longspur balm
  Dicerandra densiflora Benth. -- accepted -- Florida balm
  Dicerandra frutescens Shinners -- accepted -- scrub mint, scrub balm
  Dicerandra frutescens ssp. frutescens Shinners -- accepted -- scrub balm
  Dicerandra frutescens ssp. modesta Huck -- accepted
  Dicerandra immaculata Lakela -- not accepted -- Lakela's mint, spotless balm
  Dicerandra immaculata var. immaculata Lakela -- not accepted
  Dicerandra immaculata var. savannarum Huck -- not accepted
  Dicerandra linearifolia (Elliott) Benth. -- accepted -- coastalplain balm, coastal plain balm
  Dicerandra linearifolia var. linearifolia (Elliott) Benth. -- accepted -- coastalplain balm, coastal plain balm
  Dicerandra linearifolia var. robustior Huck -- accepted -- coastalplain balm, coastal plain balm
  Dicerandra modesta (Huck) Huck -- not accepted
  Dicerandra odoratissima R.M. Harper -- accepted -- rose balm
  Dicerandra radfordiana Huck -- accepted -- Radford's balm
  Dicerandra thinicola H.A. Mill. -- not accepted
  Dicerandra X thinicola H.A. Mill. (pro. sp.) -- not accepted
  Dicliptera Juss. -- accepted -- foldwing
  Dicliptera assurgens (L.) Juss. -- not accepted
  Dicliptera assurgens var. vahliana (Nees) M. Gómez -- not accepted
  Dicliptera brachiata (Pursh) Spreng. -- accepted -- branched foldwing
  Dicliptera brachiata var. attenuata A. Gray -- not accepted
  Dicliptera brachiata var. glandulosa (Scheele) Fernald -- not accepted
  Dicliptera brachiata var. ruthii Fernald -- not accepted
  Dicliptera chinensis (L.) Juss. -- accepted -- Chinese foldwing
  Dicliptera glandulosa Scheele -- not accepted
  Dicliptera halei Riddell -- not accepted
  Dicliptera krugii Urb. -- accepted -- Krug's foldwing
  Dicliptera martinicensis (Jacq.) Juss. -- accepted -- Martinique foldwing
  Dicliptera pseudoverticillaris A. Gray -- not accepted
  Dicliptera resupinata (Vahl) Juss. -- accepted -- Arizona foldwing
  Dicliptera sexangularis (L.) Juss. -- accepted -- sixangle foldwing
  Dicliptera torreyi A. Gray -- not accepted
  Dicliptera vahliana Nees -- not accepted
  Dicliptera viridiflora (Nees) R.W. Long -- not accepted
  Dicranostegia (A. Gray) Pennell -- accepted
  Dicranostegia orcuttiana (A. Gray) Pennell -- accepted -- Orcutt's bird's-beak
  Digitalis L. -- accepted -- foxglove
  Digitalis ambigua Murray -- not accepted
  Digitalis ferruginea L. -- accepted -- rusty foxglove
  Digitalis grandiflora Mill. -- accepted -- yellow foxglove
  Digitalis lanata Ehrh. -- accepted -- Grecian foxglove
  Digitalis lutea L. -- accepted -- straw foxglove
  Digitalis mariana Boiss. -- accepted
  Digitalis mariana ssp. heywoodii (P. Silva & M. Silva) Hinz -- accepted
  Digitalis orientalis Mill. -- not accepted
  Digitalis purpurea L. -- accepted -- purple foxglove
  Digitalis purpurea ssp. amandiana (Samp.) Hinz -- accepted
  Digitalis purpurea ssp. heywoodii P. Silva & M. Silva -- not accepted
  Digitalis purpurea ssp. purpurea L. -- accepted -- purple foxglove
  Digitalis purpurea var. alba hort. -- not accepted -- purple foxglove
  Digitalis purpurea var. amandiana (Samp.) Cout. -- not accepted
  Digitalis purpurea var. purpurea L. -- not accepted -- purple foxglove
  Digitalis purpurea var. tomentosa (Hoffmanns. & Link) Webb -- not accepted
  Diplacus Nutt. -- accepted -- bush monkeyflower
  Diplacus arachnoideus Greene -- not accepted
  Diplacus aridus Abrams -- accepted -- San Diego bush monkeyflower, low bush monkeyflower
  Diplacus aurantiacus (Curtis) Jeps. -- accepted -- orange bush monkeyflower
  Diplacus aurantiacus ssp. aurantiacus (Curtis) Jeps. -- accepted -- orange bush monkeyflower
  Diplacus aurantiacus ssp. australis (McMinn) R.M. Beeks -- accepted -- orange bush monkeyflower
  Diplacus australis McMinn -- not accepted
  Diplacus calycinus Eastw. -- accepted -- Kaweah River bush monkeyflower
  Diplacus cardinalis (Douglas ex Benth.) Groenland -- not accepted
  Diplacus clevelandii (Brandegee) Greene -- accepted -- Cleveland's bush monkeyflower
  Diplacus fasciculatus (Pennell) McMinn -- accepted -- Santa Lucia Mountain bush monkeyflower
  Diplacus glutinosus (J.C. Wendl.) Nutt. -- not accepted
  Diplacus glutinosus var. aurantiacus (Curtis) Lindl. -- not accepted
  Diplacus glutinosus var. grandiflorus Lindl. & J. Paxton -- not accepted
  Diplacus glutinosus var. puniceus (Nutt.) Benth. -- not accepted
  Diplacus grandiflorus Greene -- not accepted -- largeflower bush monkeyflower
  Diplacus grandiflorus (Lindl. & J. Paxton) Groenland -- accepted -- largeflower bush monkeyflower
  Diplacus latifolius Nutt. -- not accepted
  Diplacus leptanthus Nutt. -- not accepted
  Diplacus linearis (Benth.) Greene -- accepted -- chaparral bush monkeyflower
  Diplacus lompocensis McMinn -- accepted -- Lompoc Mesa bush monkeyflower
  Diplacus longiflorus Nutt. -- accepted -- southern bush monkeyflower
  Diplacus longiflorus var. calycinus (Eastw.) Jeps. -- not accepted
  Diplacus longiflorus var. linearis (Benth.) McMinn -- not accepted
  Diplacus longiflorus var. rutilus (A.L. Grant) McMinn -- not accepted
  Diplacus parviflorus Greene -- accepted -- island bush monkeyflower
  Diplacus puniceus Nutt. -- accepted -- red bush monkeyflower
  Diplacus rutilus (A.L. Grant) McMinn -- accepted -- Santa Susana bush monkeyflower
  Dipteracanthus drummondianus Nees -- not accepted
  Dipteracanthus linearis Torr. & A. Gray -- not accepted
  Dipteracanthus micranthus Engelm. & A. Gray -- not accepted
  Dipteracanthus nudiflorus Engelm. & A. Gray -- not accepted
  Dipteracanthus strepens (L.) Nees -- not accepted
  Distictella Kuntze -- accepted
  Distictella broadwayana Urb. -- not accepted
  Distictella magnoliifolia (Kunth) Sandwith -- accepted
  Distictella racemosa (Bureau & K. Schum.) Urb. -- not accepted
  Distictis Mart. ex Meisn. -- accepted
  Distictis buccinatoria (DC.) A.H. Gentry -- accepted -- blood-trumpet
  Distictis lactiflora (Vahl) DC. -- accepted -- liana fragante
  Distictis racemosa Bureau & K. Schum. -- not accepted
  Distictis robinsoni J.R. Johnst. -- not accepted
  Dolichandrone (Fenzl) Seem. -- accepted
  Dolichandrone spathacea (L. f.) K. Schum. -- accepted
  Dopatrium Buch.-Ham. ex Benth. -- accepted
  Dopatrium junceum (Roxb.) Buch.-Ham. ex Benth. -- accepted -- horsefly's eye
  Doxantha Miers -- not accepted
  Doxantha unguis-cati (L.) Miers -- not accepted
  Doxantha unguiscati (L.) Miers -- not accepted
  Dracocephalum L. -- accepted -- dragonhead
  Dracocephalum correllii Lundell -- not accepted
  Dracocephalum denticulatum Aiton -- not accepted
  Dracocephalum formosius (Lunell) Rydb. -- not accepted
  Dracocephalum intermedium Nutt. -- not accepted
  Dracocephalum leptophyllum (Small) Small -- not accepted
  Dracocephalum moldavica L. -- accepted -- Moldavian dragonhead
  Dracocephalum nuttallii Britton -- not accepted
  Dracocephalum parviflorum Nutt. -- accepted -- American dragonhead
  Dracocephalum peltatum L. -- not accepted
  Dracocephalum purpureum (Walter) E.M. McClint. ex Gleason -- not accepted
  Dracocephalum thymiflorum L. -- accepted -- thyme-leaf dragonhead, thymeleaf dragonhead
  Dracocephalum veroniciforme (Small) Small -- not accepted
  Dracocephalum virginianum L. -- not accepted
  Drejera juncea Torr. -- not accepted
  Drejera parviflora Buckley -- not accepted
  Drejera puberula Torr. -- not accepted
  Drejera thurberi Torr. -- not accepted
  Drejera wrightii Torr. -- not accepted
  Drejerella Lindau -- not accepted
  Drejerella mirabiloides (Lam.) Lindau -- not accepted
  Drejerella tobagensis Urb. -- not accepted
  Duchartrea sintenisii (Urb.) Britton -- not accepted
  Duranta L. -- accepted
  Duranta erecta L. -- accepted -- golden dewdrops
  Duranta erecta var. alba (Mast.) Caro -- not accepted
  Duranta fletcherana Moldenke -- not accepted
  Duranta fletcheriana Moldenke -- not accepted
  Duranta repens L. -- not accepted
  Duranta repens var. alba (Mast.) L.H. Bailey -- not accepted
  Duranta repens var. microphylla (Desf.) Moldenke -- not accepted
  Dyschoriste Nees -- accepted -- snakeherb
  Dyschoriste angusta (A. Gray) Small -- accepted -- pineland snakeherb
  Dyschoriste crenulata Kobuski -- accepted -- wavyleaf snakeherb
  Dyschoriste decumbens (A. Gray) Kuntze -- not accepted -- spreading snakeherb
  Dyschoriste humistrata (Michx.) Kuntze -- accepted -- swamp snakeherb
  Dyschoriste linearis (Torr. & A. Gray) Kuntze -- accepted -- narrowleaf dyschoriste, polkadots
  Dyschoriste linearis var. linearis (Torr. & A. Gray) Kuntze -- accepted -- polkadots
  Dyschoriste linearis var. sanpatriciensis Henrickson -- accepted
  Dyschoriste oblongifolia (Michx.) Kuntze -- accepted -- oblongleaf snakeherb
  Dyschoriste oblongifolia var. angusta (A. Gray) R.W. Long -- not accepted
  Dyschoriste schiedeana (Nees) Kuntze -- accepted -- Schied's snakeherb
  Dyschoriste schiedeana var. cinerascens Henrickson & Hilsenb. -- accepted
  Dyschoriste schiedeana var. decumbens (A. Gray) Henrickson -- accepted -- spreading snakeherb
  Elephantella attollens (A. Gray) A. Heller -- not accepted
  Elephantella groenlandica (Retz.) Rydb. -- not accepted
  Elsholtzia Willd. -- accepted
  Elsholtzia ciliata (Thunb.) Hyl. -- accepted -- crested latesummer mint
  Elsholtzia cristata Willd. -- not accepted
  Elytraria Michx. -- accepted -- scalystem
  Elytraria bromoides Oerst. -- accepted -- wheatspike scalystem
  Elytraria caroliniensis (J.F. Gmel.) Pers. -- accepted -- Carolina scalystem
  Elytraria caroliniensis var. angustifolia (Fernald) S.F. Blake -- accepted -- Carolina scalystem
  Elytraria caroliniensis var. caroliniensis (J.F. Gmel.) Pers. -- accepted -- Carolina scalystem
  Elytraria imbricata (Vahl) Pers. -- accepted -- purple scalystem
  Elytraria tridentata Vahl -- not accepted
  Elytraria virgata Michx. -- not accepted
  Elytraria virgata var. angustifolia Fernald -- not accepted
  Emorya Torr. -- accepted
  Emorya suaveolens Torr. -- accepted -- emorybush
  Enallagma latifolia (Mill.) Small -- not accepted
  Epifagus Nutt. -- accepted -- beechdrops
  Epifagus virginiana (L.) W.P.C. Barton -- accepted -- beechdrops
  Episcia Mart. -- accepted
  Episcia cupreata (Hook.) Hanst. -- accepted -- flame violet
  Episcia reptans Mart. -- accepted
  Epixiphium (Engelm. ex A. Gray) Munz -- accepted
  Epixiphium wislizeni (Engelm. ex A. Gray) Munz -- accepted -- balloonbush
  Eranthemum L. -- accepted
  Eranthemum nervosum (Vahl) R. Br. ex Roem. & Schult. -- not accepted
  Eranthemum pulchellum Andrews -- accepted -- blue-sage
  Eremophila R. Br. -- accepted
  Eremophila subfloccosa Benth. -- accepted -- fuchsia bush
  Erinus L. -- accepted
  Erinus alpinus L. -- accepted -- liver balsam, alpine balsam
  Erinus verticillatus Mill. -- not accepted
  Erythranthe cardinalis (Douglas ex Benth.) Spach -- not accepted
  Erythrochlamys Gürke -- not accepted
  Erythrochlamys spectabilis Gürke -- not accepted
  Eunanus angustatus (A. Gray) Greene -- not accepted
  Eunanus angustifolius Greene -- not accepted
  Eunanus austiniae Greene -- not accepted
  Eunanus bicolor A. Gray -- not accepted
  Eunanus bigelovii A. Gray -- not accepted
  Eunanus bolanderi (A. Gray) Greene -- not accepted
  Eunanus brevipes (Benth.) Greene -- not accepted
  Eunanus breweri Greene -- not accepted
  Eunanus clivicola (Greenm.) A. Heller -- not accepted
  Eunanus congdonii (B.L. Rob.) Greene -- not accepted
  Eunanus coulteri Harv. & A. Gray ex Benth. -- not accepted
  Eunanus coulteri var. angustatus A. Gray -- not accepted
  Eunanus cusickii Greene -- not accepted
  Eunanus douglasii Benth. -- not accepted
  Eunanus douglasii var. parviflorus Greene -- not accepted
  Eunanus fremontii Benth. -- not accepted
  Eunanus kelloggii Curran ex Greene -- not accepted
  Eunanus kelloggii var. parviflorus (Greene) Jeps. -- not accepted
  Eunanus layneae Greene -- not accepted
  Eunanus leptaleus (A. Gray) Greene -- not accepted
  Eunanus mephiticus (Greene) Greene -- not accepted
  Eunanus mohavensis (Lemmon) Greene -- not accepted
  Eunanus nanus (Hook. & Arn.) Holz. -- not accepted
  Eunanus pictus Curran ex Greene -- not accepted
  Eunanus pulchellus Drew ex Greene -- not accepted
  Eunanus rattanii (A. Gray) Greene -- not accepted
  Eunanus subsecundus (A. Gray) Greene -- not accepted
  Eunanus subuniflorus (Hook. & Arn.) Greene -- not accepted
  Eunanus tolmiei Benth. -- not accepted
  Eunanus torreyi (A. Gray) Greene -- not accepted
  Eunanus tricolor (Hartw. ex Lindl.) Greene -- not accepted
  Euphrasia L. -- accepted -- eyebright
  Euphrasia americana auct. Wetts. -- not accepted
  Euphrasia arctica ssp. borealis (F. Towns.) Yeo -- not accepted
  Euphrasia arctica var. disjuncta (Fernald & Wiegand) Cronquist -- not accepted
  Euphrasia arctica var. dolosa (B. Boivin) B. Boivin -- not accepted
  Euphrasia arctica var. mollis (Ledeb.) S.L. Welsh -- not accepted
  Euphrasia borealis (F. Towns.) Wettst. -- accepted
  Euphrasia bottnica Kihlm. -- accepted
  Euphrasia brevipila Burnat & Gremli ex Gremli -- not accepted
  Euphrasia canadensis auct. non F. Towns. -- not accepted
  Euphrasia canadensis F. Towns. -- not accepted
  Euphrasia condensata Jord. -- not accepted
  Euphrasia curta (Fr.) Wettst. -- accepted
  Euphrasia disjuncta Fernald & Wiegand -- accepted -- polar eyebright
  Euphrasia disjuncta var. dolosa B. Boivin -- not accepted
  Euphrasia frigida Pugsley -- accepted -- coldweather eyebright
  Euphrasia frigida var. obtusata (Jřrg.) Callen -- not accepted
  Euphrasia frigida var. submollis (Jřrg.) Callen -- not accepted
  Euphrasia hudsoniana Fernald & Wiegand -- accepted -- Hudson Bay eyebright
  Euphrasia hudsoniana var. contracta P.D. Sell & Yeo -- accepted -- Hudson Bay eyebright
  Euphrasia hudsoniana var. hudsoniana Fernald & Wiegand -- accepted -- Hudson Bay eyebright
  Euphrasia hudsoniana var. ramosior P.D. Sell & Yeo -- accepted -- Hudson Bay eyebright
  Euphrasia micrantha Rchb. -- accepted -- northern eyebright
  Euphrasia mollis (Ledeb.) Wettst. -- accepted -- subalpine eyebright
  Euphrasia mollis var. laurentiana B. Boivin -- not accepted
  Euphrasia nemorosa (Pers.) Wallr. -- accepted -- common eyebright
  Euphrasia oakesii Wettst. -- accepted -- Oakes' eyebright
  Euphrasia officinalis auct. non L. -- not accepted
  Euphrasia ostenfeldii (Pugsley) Yeo -- accepted -- Ostenfeld's eyebright
  Euphrasia pectinata auct. non Ten. -- not accepted
  Euphrasia pennellii Callen -- not accepted
  Euphrasia purpurea Reeks -- not accepted
  Euphrasia randii B.L. Rob. -- accepted -- small eyebright
  Euphrasia randii var. farlowii B.L. Rob. -- not accepted
  Euphrasia randii var. reeksii Fernald -- not accepted
  Euphrasia rigidula Jord. -- not accepted
  Euphrasia rostkoviana Hayne -- not accepted -- eyebright
  Euphrasia salisburgensis Funck -- accepted -- Salisburg eyebright
  Euphrasia salisburgensis var. hibernica Pugsley -- accepted -- Salisburg eyebright
  Euphrasia stricta D. Wolff ex J.F. Lehm. -- accepted -- drug eyebright
  Euphrasia subarctica Raup -- accepted -- arctic eyebright
  Euphrasia subarctica auct. non Raup -- not accepted
  Euphrasia suborbicularis P.D. Sell & Yeo -- accepted -- roundleaf eyebright
  Euphrasia tatarica auct. non Fisch. ex Spreng. -- not accepted -- European eyebright
  Euphrasia tetraquetra (Brébiss.) Arrond. -- accepted -- maritime eyebright
  Euphrasia vinacea P.D. Sell & Yeo -- accepted -- glacier eyebright
  Euphrasia williamsii B.L. Rob. -- not accepted
  Euphrasia williamsii var. vestita Fernald & Wiegand -- not accepted
  Euphrasia X aequalis Callen -- accepted -- eyebright
  Euphrasia X aspera Callen -- not accepted
  Euphrasia X vestita Callen -- not accepted -- eyebright
  Euphrasia X villosa Callen -- not accepted -- villous eyebright
  Faradaya F. Muell. -- accepted
  Faradaya amicorum (Seem.) Seem. -- accepted
  Faradaya powellii Seem. ex Powell -- not accepted
  Flemingia grandiflora Roxb. ex Rottler -- not accepted
  Fontanesia Labill. -- accepted
  Fontanesia fortunei Carričre -- not accepted
  Fontanesia phillyreoides Labill. -- accepted -- Syrian-privet
  Fontanesia phillyreoides ssp. fortunei (Carričre) Yalt. -- accepted
  Forestiera Poir. -- accepted -- swamp privet, swampprivet
  Forestiera acuminata (Michx.) Poir. -- accepted -- swamp privet, Texas forestiera, eastern swampprivet
  Forestiera acuminata var. parviflora A. Gray -- not accepted
  Forestiera acuminata var. vestita Palmer -- not accepted
  Forestiera angustifolia Torr. -- accepted -- Texas forestiera, narrowleaf forestiera, Texas swampprivet
  Forestiera autumnalis (Michx.) Poir. -- not accepted
  Forestiera eggersiana Krug & Urb. -- accepted -- inkbush
  Forestiera globularis Small -- not accepted
  Forestiera godfreyi L.C. Anderson -- accepted -- Godfrey's swampprivet
  Forestiera ligustrina (Michx.) Poir. -- accepted -- privet, upland swampprivet
  Forestiera neomexicana A. Gray -- not accepted
  Forestiera neomexicana var. arizonica A. Gray -- not accepted
  Forestiera phillyreoides (Benth.) Torr. -- not accepted -- desert-olive forestiera
  Forestiera pinetorum Small -- not accepted
  Forestiera porulosa (Michx.) Poir. -- not accepted
  Forestiera puberula Eastw. -- not accepted
  Forestiera pubescens Nutt. -- accepted -- downy forestiera, desert olive, elbowbush, stretchberry
  Forestiera pubescens ssp. neomexicana (A. Gray) E.A. Murray -- not accepted
  Forestiera pubescens var. glabrifolia Shinners -- accepted -- stretchberry
  Forestiera pubescens var. neomexicana (A. Gray) E.A. Murray -- not accepted
  Forestiera pubescens var. pubescens Nutt. -- accepted -- stretchberry, New Mexico olive, New Mexico forestiera
  Forestiera reticulata Torr. -- accepted -- netleaf forestiera, netleaf swampprivet
  Forestiera rhamnifolia Griseb. -- accepted -- caca ravet
  Forestiera segregata (Jacq.) Krug & Urb. -- accepted -- Florida privet, Florida swampprivet
  Forestiera segregata var. pinetorum (Small) M.C. Johnst. -- accepted -- Florida swampprivet
  Forestiera segregata var. segregata (Jacq.) Krug & Urb. -- accepted -- Florida swampprivet
  Forestiera shrevei Standl. -- accepted -- desert-olive, desert olive
  Forestiera sphaerocarpa Torr. -- not accepted
  Forestiera texana Cory -- not accepted
  Forsythia Vahl -- accepted
  Forsythia europaea Degen & Bald. -- accepted
  Forsythia ovata Nakai -- accepted -- early forsythia
  Forsythia suspensa (Thunb.) Vahl -- accepted -- weeping forsythia
  Forsythia viridissima Lindl. -- accepted -- greenstem forsythia
  Forsythia X intermedia Zabel -- accepted -- showy forsythia
  Fraxinus L. -- accepted -- ash
  Fraxinus americana L. -- accepted -- white ash
  Fraxinus americana ssp. texensis (A. Gray) G.N. Mill. -- not accepted
  Fraxinus americana var. biltmoreana (Beadle) J. Wright ex Fernald -- not accepted
  Fraxinus americana var. crassifolia Sarg. -- not accepted
  Fraxinus americana var. curtissii (Vasey) Small -- not accepted
  Fraxinus americana var. juglandifolia (Lam.) Rehder -- not accepted
  Fraxinus americana var. microcarpa A. Gray -- not accepted
  Fraxinus americana var. texensis A. Gray -- not accepted
  Fraxinus anomala Torr. ex S. Watson -- accepted -- singleleaf ash
  Fraxinus anomala var. anomala Torr. ex S. Watson -- accepted -- singleleaf ash
  Fraxinus anomala var. lowellii (Sarg.) Little -- accepted -- Lowell ash, singleleaf ash
  Fraxinus berlandierana DC. -- not accepted
  Fraxinus berlandieriana DC. -- accepted -- Mexican ash
  Fraxinus biltmoreana Beadle -- not accepted
  Fraxinus campestris Britton -- not accepted
  Fraxinus caroliniana Mill. -- accepted -- Carolina ash
  Fraxinus caroliniana var. cubensis (Griseb.) Lingelsh. -- not accepted
  Fraxinus caroliniana var. oblanceolata (M.A. Curtis) Fernald & B.G. Schub. -- not accepted
  Fraxinus chinensis Roxb. -- accepted -- Chinese ash
  Fraxinus cuspidata Torr. -- accepted -- fragrant ash
  Fraxinus cuspidata var. macropetala (Eastw.) Rehder -- not accepted -- large-petaled ash
  Fraxinus darlingtonii Britton -- not accepted
  Fraxinus dipetala Hook. & Arn. -- accepted -- two-petal ash, California ash
  Fraxinus dipetala var. trifoliolata Torr. -- not accepted
  Fraxinus excelsior L. -- accepted -- European ash
  Fraxinus gooddingii Little -- accepted -- Goodding's ash
  Fraxinus greggii A. Gray -- accepted -- Gregg's ash
  Fraxinus jonesii Lingelsh. -- not accepted
  Fraxinus lanceolata Borkh. -- not accepted
  Fraxinus latifolia Benth. -- accepted -- Oregon ash
  Fraxinus lowellii Sarg. -- not accepted
  Fraxinus mandshurica Rupr. -- accepted -- Manchurian ash
  Fraxinus mariesii Hook. f. -- not accepted -- Maries' ash
  Fraxinus michauxii Britton -- not accepted
  Fraxinus nigra Marsh. -- accepted -- black ash
  Fraxinus oregona Nutt. -- not accepted
  Fraxinus ornus L. -- accepted -- flowering ash
  Fraxinus papillosa Lingelsh. -- accepted -- Chihuahuan ash
  Fraxinus pauciflora Nutt. -- not accepted
  Fraxinus pennsylvanica Marsh. -- accepted -- green ash
  Fraxinus pennsylvanica ssp. oregona (Nutt.) G.N. Mill. -- not accepted
  Fraxinus pennsylvanica ssp. velutina (Torr.) G.N. Mill. -- not accepted
  Fraxinus pennsylvanica var. austinii Fernald -- not accepted
  Fraxinus pennsylvanica var. integerrima (Vahl) Fernald -- not accepted
  Fraxinus pennsylvanica var. lanceolata (Borkh.) Sarg. -- not accepted
  Fraxinus pennsylvanica var. pennsylvanica Marsh. -- not accepted -- green ash
  Fraxinus pennsylvanica var. subintegerrima (Vahl) Fernald -- not accepted
  Fraxinus profunda (Bush) Bush -- accepted -- pumpkin ash
  Fraxinus quadrangulata Michx. -- accepted -- blue ash
  Fraxinus smallii Britton -- not accepted
  Fraxinus texensis (A. Gray) Sarg. -- accepted -- Texas ash
  Fraxinus tomentosa Michx. f. -- not accepted
  Fraxinus trifoliata (Torr.) F.H. Lewis & Epling -- not accepted
  Fraxinus trifoliolata (Torr.) F.H. Lewis & Epling -- not accepted
  Fraxinus uhdei (Wenz.) Lingelsh. -- accepted -- Mexican ash, tropical ash, shamel ash
  Fraxinus velutina Torr. -- accepted -- velvet ash
  Fraxinus velutina var. coriacea (S. Watson) Rehder -- not accepted
  Fraxinus velutina var. glabra Rehder -- not accepted
  Fraxinus velutina var. toumeyi (Britton) Rehder -- not accepted
  Galeopsis L. -- accepted -- hempnettle
  Galeopsis angustifolia Ehrh. ex Hoffm. -- accepted -- narrowleaf hempnettle
  Galeopsis bifida Boenn. -- accepted -- split-lip hemp-nettle, splitlip hempnettle
  Galeopsis ladanum L. -- accepted -- red hempnettle
  Galeopsis ladanum var. angustifolia (Ehrh. ex Hoffm.) Wallr. -- not accepted
  Galeopsis ladanum var. ladanum L. -- accepted -- red hempnettle
  Galeopsis ladanum var. latifolia (Hoffm.) Wallr. -- accepted -- red hempnettle
  Galeopsis pubescens Besser -- accepted -- hairy hempnettle
  Galeopsis segetum Neck. -- accepted -- hempnettle
  Galeopsis speciosa Mill. -- accepted -- Edmonton hempnettle
  Galeopsis tetrahit L. -- accepted -- bristlestem hempnettle, brittle-stem hemp-nettle, brittlestem hempnettle
  Galeopsis tetrahit var. arvensis Schltdl. -- accepted -- brittlestem hempnettle
  Galeopsis tetrahit var. bifida (Boenn.) Lej. & Courtois -- not accepted
  Galeopsis tetrahit var. tetrahit L. -- accepted -- brittlestem hempnettle
  Galeopsis versicolor W.M. Curtis -- not accepted
  Galeopsis villosa Huds. -- not accepted
  Galvezia Dombey ex Juss. -- accepted
  Galvezia speciosa (Nutt.) A. Gray -- not accepted -- island snapdragon
  Gambelia Nutt. -- accepted -- greenbright
  Gambelia speciosa Nutt. -- accepted -- showy greenbright
  Gatesia laetevirens (Buckley) A. Gray -- not accepted
  Gerardia Benth. -- not accepted
  Gerardia acuta (Pennell) Pennell -- not accepted
  Gerardia aphylla Nutt. -- not accepted
  Gerardia aphylla var. grandiflora Benth. -- not accepted
  Gerardia aspera Douglas ex Benth. -- not accepted
  Gerardia auriculata Michx. -- not accepted
  Gerardia barbata (Torr. & A. Gray) S.F. Blake -- not accepted
  Gerardia besseyana Britton -- not accepted
  Gerardia caddoensis (Pennell) Pennell -- not accepted
  Gerardia calycina (Pennell) Pennell -- not accepted
  Gerardia calycosa (Mack. & Bush) Fernald -- not accepted
  Gerardia decemloba Greene -- not accepted
  Gerardia densiflora Benth. -- not accepted
  Gerardia dispersa (Small) K. Schum. -- not accepted
  Gerardia divaricata Chapm. -- not accepted
  Gerardia dulcis (Cav.) Nees -- not accepted
  Gerardia dulcis var. floridana (A. Gray) S.F. Blake -- not accepted
  Gerardia edwardsiana (Pennell) Pennell -- not accepted
  Gerardia edwardsiana ssp. glabra (Pennell) Pennell -- not accepted
  Gerardia edwardsiana ssp. typica Pennell -- not accepted
  Gerardia fasciculata Elliott -- not accepted
  Gerardia fasciculata ssp. peninsularis (Pennell) Pennell -- not accepted
  Gerardia filicaulis (Benth.) Chapm. -- not accepted
  Gerardia filifolia Nutt. -- not accepted
  Gerardia filifolia var. gatesii Benth. -- not accepted
  Gerardia flava L. -- not accepted
  Gerardia flava var. calycosa (Mack. & Bush) Steyerm. -- not accepted
  Gerardia flava var. macrantha (Pennell) Fernald -- not accepted
  Gerardia flava var. reticulata (Raf.) Cory -- not accepted
  Gerardia floridana (A. Gray) Small -- not accepted
  Gerardia gatesii (Benth.) Pennell -- not accepted
  Gerardia gattingeri Small -- not accepted
  Gerardia georgiana C.L. Boynt. -- not accepted
  Gerardia grandiflora Benth. -- not accepted
  Gerardia grandiflora var. cinerea (Pennell) Cory -- not accepted
  Gerardia grandiflora var. pulchra (Pennell) Fernald -- not accepted
  Gerardia grandiflora var. serrata (Torr. ex Benth.) B.L. Rob. -- not accepted
  Gerardia heterophylla Nutt. -- not accepted
  Gerardia homalantha (Pennell) Pennell -- not accepted
  Gerardia keyensis (Pennell) Pennell -- not accepted
  Gerardia laevigata Raf. -- not accepted
  Gerardia laxa (Pennell) Pennell -- not accepted
  Gerardia leucanthera Raf. -- not accepted
  Gerardia levigata Raf. -- not accepted
  Gerardia linifolia Nutt. -- not accepted
  Gerardia longifolia Nutt. -- not accepted
  Gerardia maritima Raf. -- not accepted
  Gerardia maritima ssp. grandiflora (Benth.) Pennell -- not accepted
  Gerardia maritima var. grandiflora Benth. -- not accepted
  Gerardia microphylla (A. Gray) Small -- not accepted
  Gerardia neoscotica Greene -- not accepted
  Gerardia obtusifolia (Raf.) Pennell -- not accepted
  Gerardia parvifolia Chapm. -- not accepted
  Gerardia patula (Chapm.) A. Gray -- not accepted
  Gerardia paupercula (A. Gray) Britton -- not accepted
  Gerardia paupercula ssp. borealis (Pennell) Pennell -- not accepted
  Gerardia paupercula var. borealis (Pennell) Deam -- not accepted
  Gerardia paupercula var. typica Pennell -- not accepted
  Gerardia pectinata (Nutt.) Benth. -- not accepted
  Gerardia pedicularia L. -- not accepted
  Gerardia pedicularia var. ambigens Fernald -- not accepted
  Gerardia pedicularia var. austromontana (Pennell) Fernald -- not accepted
  Gerardia pedicularia var. intercedens (Pennell) Fernald -- not accepted
  Gerardia pedicularia var. pectinata Nutt. -- not accepted
  Gerardia plukenetii Elliott -- not accepted
  Gerardia plukenetii var. microphylla A. Gray -- not accepted
  Gerardia polyphylla Small -- not accepted
  Gerardia portoricensis Britton & P. Wilson -- not accepted
  Gerardia pseudaphylla (Pennell) Pennell -- not accepted
  Gerardia pulchella Pennell -- not accepted
  Gerardia pulchella var. delicatula (Pennell) Pennell -- not accepted
  Gerardia pulcherrima Pennell -- not accepted
  Gerardia purpurea L. -- not accepted
  Gerardia purpurea ssp. parvula Pennell -- not accepted
  Gerardia purpurea var. carteri (Pennell) Pennell -- not accepted
  Gerardia purpurea var. grandiflora Benth. -- not accepted
  Gerardia purpurea var. neoscotica (Greene) Gleason -- not accepted
  Gerardia purpurea var. parviflora Benth. -- not accepted
  Gerardia purpurea var. paupercula A. Gray -- not accepted
  Gerardia purpurea var. racemulosa (Pennell) Gleason -- not accepted
  Gerardia racemulosa Pennell -- not accepted
  Gerardia setacea J.F. Gmel. -- not accepted
  Gerardia setacea var. parvifolia Benth. -- not accepted
  Gerardia skinneriana Alph. Wood -- not accepted
  Gerardia spiciflora Engelm. -- not accepted
  Gerardia stenophylla (Pennell) Pennell -- not accepted
  Gerardia strictifolia Benth. -- not accepted
  Gerardia tenella (Pennell) Pennell -- not accepted
  Gerardia tenuifolia Vahl -- not accepted
  Gerardia tenuifolia ssp. leucanthera (Raf.) Pennell -- not accepted
  Gerardia tenuifolia ssp. macrophylla (Benth.) Pennell -- not accepted
  Gerardia tenuifolia ssp. parviflora (Nutt.) Pennell -- not accepted
  Gerardia tenuifolia ssp. polyphylla (Small) Pennell -- not accepted
  Gerardia tenuifolia var. humilis Benth. -- not accepted
  Gerardia tenuifolia var. leucanthera (Raf.) Shinners -- not accepted
  Gerardia tenuifolia var. macrophylla Benth. -- not accepted
  Gerardia tenuifolia var. parviflora Nutt. -- not accepted
  Gerardia tenuifolia var. polyphylla (Small) Shinners -- not accepted
  Gerardia tenuifolia var. typica Pennell -- not accepted
  Gerardia tuberosa L. -- not accepted
  Gerardia virginica (L.) Britton, Sterns & Poggenb. -- not accepted
  Gerardia viridis Small -- not accepted
  Gesneria Plum. ex L. -- accepted
  Gesneria citrina Urb. -- accepted -- yerba Puerto Rico de cueva
  Gesneria cuneifolia (DC.) Fritsch -- accepted -- yerba parrera
  Gesneria pauciflora Urb. -- accepted -- yerba maricao de cueva
  Gesneria pedunculosa (DC.) Fritsch -- accepted -- arbol de Navidad
  Gesneria reticulata (Griseb.) Urb. -- accepted -- yerba neto hoja de cueva
  Gesneria sintenisii Urb. -- not accepted
  Gesneria viridiflora (Decne.) Kuntze -- accepted -- grassflower
  Gesneria viridiflora ssp. sintenisii (Urb.) L.E. Skog -- accepted -- grassflower
  Gesneria viridiflora ssp. viridiflora (Decne.) Kuntze -- accepted
  Gesneria viridiflora var. viridiflora (Decne.) Kuntze -- not accepted
  Gesneriaceae -- accepted -- gesnerias
  Ghinia Schreb. -- not accepted
  Ghinia boxiana Moldenke -- not accepted
  Ghinia spinosa (Sw.) Britton & P. Wilson -- not accepted
  Glandularia J.F. Gmel. -- accepted -- mock vervain
  Glandularia bipinnatifida (Nutt.) Nutt. -- accepted -- Dakota mock vervain
  Glandularia bipinnatifida var. bipinnatifida (Nutt.) Nutt. -- accepted -- Dakota verbena, Dakota mock vervain
  Glandularia bipinnatifida var. brevispicata Umber -- not accepted -- Dakota mock vervain
  Glandularia bipinnatifida var. ciliata (Benth.) B.L. Turner -- accepted -- Davis Mountain mock vervain
  Glandularia canadensis (L.) Nutt. -- accepted -- rose verbena, rose mock vervain
  Glandularia chamaedryfolia Juss. -- not accepted
  Glandularia chiricahensis Umber -- accepted -- Chiricahua mock vervain, Chiricahua Mountain mock vervain
  Glandularia delticola (Small) Umber -- accepted -- moradia
  Glandularia drummondii (Lindl.) Small -- not accepted
  Glandularia elegans (Kunth) Umber -- accepted -- mountain mock vervain
  Glandularia elegans var. asperata (L.M. Perry) Umber -- accepted -- mountain mock vervain
  Glandularia elegans var. elegans (Kunth) Umber -- accepted -- mountain mock vervain, fringed verbena
  Glandularia gooddingii (Briq.) Solbrig -- accepted -- Goodding's verbena, desert vervain, southwestern mock vervain
  Glandularia hispida Ruiz & Pav. -- accepted -- hispid mock vervain
  Glandularia incisa (Hook.) Tronc. -- accepted -- crisped mock vervain
  Glandularia lambertii (Sims) Small -- not accepted
  Glandularia maritima (Small) Small -- accepted -- coastal mock vervain
  Glandularia peruviana (L.) Small -- accepted -- Peruvian mock vervain
  Glandularia polyantha Umber -- accepted -- Rio Grande mock vervain
  Glandularia pulchella (Sweet) Tronc. -- accepted -- South American mock vervain
  Glandularia pumila (Rydb.) Umber -- accepted -- pink verbena, pink mock vervain
  Glandularia quadrangulata (A. Heller) Umber -- accepted -- beaked mock vervain
  Glandularia quadrangulata f. albida (Moldenke) B.L. Turner -- accepted -- Chihuahuan mock vervain
  Glandularia quandrangulata (A. Heller) Umber -- not accepted
  Glandularia racemosa (Eggert) Umber -- accepted -- pale mock vervain
  Glandularia tampensis (Nash) Small -- accepted -- Tampa mock vervain
  Glandularia tenera (Spreng.) Cabrera -- accepted -- Latin American mock vervain
  Glandularia tenuisecta (Briq.) Small -- not accepted
  Glandularia tumidula (L.M. Perry) Umber -- accepted -- plains mock vervain
  Glandularia verecunda Umber -- not accepted -- Chihuahuan mock vervain
  Glandularia wrightii (A. Gray) Umber -- not accepted -- Wright's verbena, Davis Mountain mock vervain
  Glandularia X hybrida (Groenland & Rümpler) G.L. Nesom & Pruski -- accepted
  Glechoma L. -- accepted
  Glechoma hederacea L. -- accepted -- creeping charlie, gill-over-the-ground, haymaids, groundivy, ground ivy
  Glechoma hederacea var. hederacea L. -- not accepted -- groundivy
  Glechoma hederacea var. micrantha Moric. -- not accepted -- groundivy
  Glechoma hederacea var. parviflora (Benth.) House -- not accepted
  Glecoma L. -- not accepted
  Glecoma hederacea L. -- not accepted
  Globifera umbrosa J.F. Gmel. -- not accepted
  Glossostigma Wight & Arn. -- accepted
  Glossostigma cleistanthum W.R. Barker -- accepted -- mudmats
  Glossostigma diandrum (L.) Kunze -- accepted -- mudmats
  Glossostylis aspera Cham. & Schltdl. -- not accepted
  Gloxinia L'Hér. -- accepted
  Gloxinia perennis (L.) Fritsch -- accepted -- Canterbury bells
  Gmelina L. -- accepted
  Gmelina arborea Roxb. -- accepted -- gumhar
  Gmelina asiatica L. -- accepted -- Asian bushbeech
  Gmelina philippensis Cham. -- accepted -- wild sage
  Goniostachyum citrosum Small -- not accepted
  Graptophyllum Nees -- accepted
  Graptophyllum pictum (L.) Griff. -- accepted -- caricature-plant
  Gratiola L. -- accepted -- hedge hyssop, hedgehyssop
  Gratiola aurea Pursh -- accepted -- golden hedge-hyssop, golden hedgehyssop
  Gratiola aurea var. obtusa Pennell -- not accepted
  Gratiola brevifolia Raf. -- accepted -- sticky hedgehyssop
  Gratiola dubia L. -- not accepted
  Gratiola ebracteata Benth. ex A. DC. -- accepted -- bractless hedgehyssop
  Gratiola flava Leavenworth -- accepted -- yellow hedgehyssop
  Gratiola floridana Nutt. -- accepted -- Florida hedgehyssop
  Gratiola heterosepala H. Mason & Bacig. -- accepted -- Boggs Lake hedge-hyssop
  Gratiola hispida (Benth. ex Lindl.) Pollard -- accepted -- rough hedgehyssop
  Gratiola lutea Raf. -- not accepted
  Gratiola neglecta Torr. -- accepted -- clammy hedgehyssop, clammy hedge-hyssop, drug hedgehyssop, neglected hedgehyssop, hedge hyssop
  Gratiola neglecta var. glaberrima (Fernald) Fernald -- not accepted -- gratiole négligée variété du Saint-Laurent
  Gratiola officinalis L. -- accepted -- hedgehyssop
  Gratiola pilosa Michx. -- accepted -- shaggy hedgehyssop
  Gratiola pilosa var. epilis Pennell -- not accepted
  Gratiola ramosa Walter -- accepted -- branched hedgehyssop
  Gratiola repens Sw. -- not accepted
  Gratiola sphaerocarpa Elliott -- not accepted
  Gratiola subulata Baldwin ex Benth. -- not accepted
  Gratiola virginiana L. -- accepted -- roundfruit hedgehyssop, Virginia hedgehyssop
  Gratiola virginiana var. aestuariorum Pennell -- accepted -- roundfruit hedgehyssop
  Gratiola virginiana var. virginiana L. -- accepted -- roundfruit hedgehyssop
  Gratiola viscidula Pennell -- accepted -- Short's hedgehyssop
  Gratiola viscidula ssp. shortii Durand ex Pennell -- not accepted
  Gratiola viscidula var. shortii (Durand ex Pennell) Gleason -- not accepted
  Gratiola viscosa Schwein. -- not accepted
  Haenianthus Griseb. -- accepted
  Haenianthus obovatus Krug & Urb. -- not accepted
  Haenianthus salicifolius Griseb. -- accepted -- palo de hueso
  Haenianthus salicifolius var. obovatus (Krug & Urb.) Knobl. -- accepted -- palo de hueso
  Haenianthus salicifolius var. salicifolius Griseb. -- accepted -- palo de hueso
  Handroanthus Mattos -- accepted
  Handroanthus capitatus (Bureau ex. K. Schum.) Mattos -- accepted -- arawnig
  Handroanthus chrysanthus (Jacq.) S.O. Grose -- accepted -- roble amarillo
  Handroanthus serratifolius (Vahl) S.O. Grose -- accepted -- yellow poui
  Haplostachys (A. Gray) Hillebr. -- accepted
  Haplostachys bryanii Sherff -- accepted -- Molokai islandmint
  Haplostachys bryanii var. microdonta Sherff -- not accepted
  Haplostachys bryanii var. robusta Sherff -- not accepted
  Haplostachys haplostachya (A. Gray) H. St. John -- accepted -- honohono
  Haplostachys haplostachya var. angustifolia (Sherff) H. St. John -- not accepted
  Haplostachys haplostachya var. leptostachya (Hillebr.) H. St. John -- not accepted
  Haplostachys linearifolia (Drake) Sherff -- accepted -- woodland islandmint
  Haplostachys linearifolia var. rosmarinifolia (Hillebr.) Sherff -- not accepted
  Haplostachys munroi C.N. Forbes -- accepted -- Lanai islandmint
  Haplostachys truncata (A. Gray) Hillebr. -- accepted -- Maui islandmint
  Harpagophytum DC. ex Meisn. -- accepted
  Harpagophytum procumbens (Burch.) DC. ex Meisn. -- accepted -- devil's-claw
  Hebe Comm. ex Juss. -- accepted
  Hebe speciosa (R. Cunn. ex A. Cunn.) Andersen -- accepted -- New Zealand hebe
  Hebe venustula (Colenso) Cockayne -- accepted
  Hebe X franciscana (Eastw.) Souster -- accepted -- Francisco hebe
  Hedeoma Pers. -- accepted -- falsepennyroyal, pennyroyal, false pennyroyal
  Hedeoma acinoides Scheele -- accepted -- slender hedeome, slender false pennyroyal
  Hedeoma angulata Tharp -- not accepted
  Hedeoma apiculata W.S. Stewart -- accepted -- falsepennyroyal, McKittrick's false pennyroyal
  Hedeoma apiculatum W.S. Stewart -- not accepted -- McKittrick pennyroyal
  Hedeoma arkansana Nutt. -- not accepted
  Hedeoma blepharodonta Greene -- not accepted
  Hedeoma campora Rydb. -- not accepted
  Hedeoma ciliata (Benth.) Benth. ex A. DC. -- not accepted
  Hedeoma ciliata Nutt. -- not accepted
  Hedeoma convisae A. Nelson -- not accepted
  Hedeoma costata Hemsl. -- accepted -- false pennyroyal, falsepennyroyal, ribbed false pennyroyal
  Hedeoma costata var. costata Hemsl. -- accepted -- falsepennyroyal, ribbed false pennyroyal
  Hedeoma costata var. pulchella (Greene) Irving -- accepted -- ribbed false pennyroyal, false pennyroyal, falsepennyroyal
  Hedeoma costatum Hemsl. -- not accepted
  Hedeoma costatum var. costatum Hemsl. -- not accepted
  Hedeoma costatum var. puchellum (Greene) Irving -- not accepted
  Hedeoma dentata Torr. -- accepted -- dentate falsepennyroyal, dentate false pennyroyal
  Hedeoma dentatum Torr. -- not accepted
  Hedeoma diffusa Greene -- accepted -- spreading false pennyroyal
  Hedeoma diffusum Greene -- not accepted -- Flagstaff pennyroyal
  Hedeoma drummondii Benth. -- accepted -- Drummond's pennyroyal, Drummond's false pennyroyal
  Hedeoma drummondii var. crenulata Irving -- not accepted
  Hedeoma drummondii var. reverchonii A. Gray -- not accepted
  Hedeoma glabra Nutt. -- not accepted
  Hedeoma glabrescens (A. Gray) Briq. -- not accepted
  Hedeoma graveolens Chapm. ex A. Gray -- not accepted -- mock pennyroyal
  Hedeoma hispida Pursh -- accepted -- rough pennyroyal, false pennyroyal, falsepennyroyal, rough falsepennyroyal, rough false pennyroyal
  Hedeoma hispidum Pursh -- not accepted
  Hedeoma hyssopifolia A. Gray -- accepted -- mock pennyroyal, falsepennyroyal, aromatic false pennyroyal
  Hedeoma hyssopifolium A. Gray -- not accepted
  Hedeoma incana Torr. -- not accepted
  Hedeoma lata Small -- not accepted
  Hedeoma longiflora Rydb. -- not accepted
  Hedeoma molle Torr. -- not accepted
  Hedeoma mollis Torr. -- accepted -- falsepennyroyal, softhair false pennyroyal
  Hedeoma nana (Torr.) Briq. -- accepted -- false pennyroyal, dwarf pennyroyal, dwarf false pennyroyal
  Hedeoma nana ssp. californica W.S. Stewart -- accepted -- California falsepennyroyal, California false pennyroyal
  Hedeoma nana ssp. macrocalyx W.S. Stewart -- accepted -- false pennyroyal, dwarf false pennyroyal
  Hedeoma nana ssp. nana (Torr.) Briq. -- accepted -- false pennyroyal, falsepennyroyal, dwarf false pennyroyal
  Hedeoma nana ssp. typica W.S. Stewart -- not accepted
  Hedeoma nanum (Torr.) Briq. -- not accepted
  Hedeoma oblongifolia (A. Gray) A. Heller -- accepted -- falsepennyroyal, false pennyroyal, oblongleaf false pennyroyal
  Hedeoma oblongifolium (A. Gray) A. Heller -- not accepted
  Hedeoma ovata A. Nelson -- not accepted
  Hedeoma pilosa R.S. Irving -- accepted -- falsepennyroyal, old blue false pennyroyal
  Hedeoma pilosum Irving -- not accepted -- old blue mock pennyroyal
  Hedeoma piperita var. oblongifolia A. Gray -- not accepted
  Hedeoma plicata Torr. -- accepted -- falsepennyroyal, veiny false pennyroyal
  Hedeoma plicatum Torr. -- not accepted
  Hedeoma pulchella Greene -- not accepted
  Hedeoma pulcherrima Wooton & Standl. -- accepted -- White Mountain false pennyroyal
  Hedeoma pulcherrimum Wooton & Standl. -- not accepted
  Hedeoma pulegioides (L.) Pers. -- accepted -- American false pennyroyal
  Hedeoma reverchonii (A. Gray) A. Gray -- accepted -- Reverchon's falsepennyroyal, Reverchon's false pennyroyal
  Hedeoma reverchonii var. reverchonii (A. Gray) A. Gray -- accepted -- Reverchon's falsepennyroyal, Reverchon's false pennyroyal
  Hedeoma reverchonii var. serpyllifolia (Small) Irving -- accepted -- Reverchon's falsepennyroyal, Reverchon's false pennyroyal
  Hedeoma reverchonii var. serpyllifolium (Small) Irving -- not accepted
  Hedeoma sancta Small -- not accepted
  Hedeoma serpyllifolia Small -- not accepted
  Hedeoma serpylloides Torr. -- not accepted
  Hedeoma tenella Hemsl. -- not accepted
  Hedeoma texana Cory -- not accepted
  Hedeoma thymoides A. Gray -- not accepted
  Hedeoma thymoides var. oblongifolia (A. Gray) A. Gray -- not accepted
  Hedeoma todsenii R.S. Irving -- accepted -- Todsen's pennyroyal, Todsen's false pennyroyal
  Hemianthus Nutt. -- not accepted
  Hemianthus callitrichoides Griseb. -- not accepted
  Hemianthus glomeratus (Chapm.) Pennell -- not accepted
  Hemianthus micranthemoides Nutt. -- not accepted
  Hemichaena Benth. -- accepted
  Hemichaena fruticosa Benth. -- accepted
  Hemigraphis Nees -- accepted
  Hemigraphis alternata (Burm. f.) T. Anderson -- accepted -- redivy
  Hemigraphis reptans (G. Forst.) T. Anderson ex Hemsl. -- accepted -- redflame
  Henrya Nees ex Benth. -- accepted
  Henrya brevifolia Happ -- not accepted
  Henrya insularis Nees ex Benth. -- accepted -- island-renegade, island renegade
  Herpestis rotundifolia C.F. Gaertn. -- not accepted
  Hippuris L. -- accepted -- mare's-tail
  Hippuris lanceolata Retz. -- accepted
  Hippuris montana Ledeb. ex Rchb. -- accepted -- mountain mare's-tail
  Hippuris tetraphylla L. f. -- accepted -- fourleaf mare's-tail
  Hippuris vulgaris L. -- accepted -- common mare's-tail, common mare's tail
  Holmgrenanthe Elisens -- accepted -- rocklady
  Holmgrenanthe petrophila (Coville & C.V. Morton) Elisens -- accepted -- rock lady
  Holmskioldia Retz. -- accepted
  Holmskioldia sanguinea Retz. -- accepted -- Chinese hatplant
  Holographis Nees -- accepted
  Holographis virgata (Harv. ex Benth. & Hook. f.) T.F. Daniel -- accepted -- white devilbush
  Hottonia indica L. -- not accepted
  Howelliella Rothm. -- accepted
  Howelliella ovata (Eastw.) Rothm. -- accepted -- ovateleaf snapdragon
  Hydranthelium rotundifolium (Michx.) Pennell -- not accepted
  Hydrotrida caroliniana (Walter) Small -- not accepted
  Hygrophila R. Br. -- accepted -- swampweed
  Hygrophila angustifolia R. Br. -- not accepted
  Hygrophila auriculata (Schumach.) Heine -- accepted
  Hygrophila brasiliensis (Spreng.) Lindau -- not accepted -- yerba de hicotea
  Hygrophila corymbosa (Blume) Lindau -- accepted -- starhorn
  Hygrophila costata Nees & T. Nees -- accepted -- yerba de hicotea
  Hygrophila lacustris (Schltdl. & Cham.) Nees -- accepted -- gulf swampweed
  Hygrophila polysperma (Roxb.) T. Anderson -- accepted -- East Indian hygrophila, Miramar weed, Indian swampweed
  Hygrophila portoricensis Nees -- not accepted
  Hygrophila salicifolia (Vahl) Nees -- not accepted
  Hygrophila triflora (Roxb.) Fosberg & Sachet -- accepted
  Hypoestes Sol. ex R. Br. -- accepted
  Hypoestes phyllostachya Baker -- accepted -- polkadot-plant
  Hypogon verticillata (Baldw.) House -- not accepted
  Hypogon verticillata Raf. -- not accepted
  Hyptis Jacq. -- accepted -- bushmint
  Hyptis alata (Raf.) Shinners -- accepted -- clustered bushmint
  Hyptis alata var. stenophylla Shinners -- not accepted
  Hyptis americana (Aubl.) Urb. -- not accepted -- American bushmint
  Hyptis americana (Poit.) Briq. -- accepted -- American bushmint
  Hyptis atrorubens Poit. -- accepted -- marubio oscuro
  Hyptis capitata Jacq. -- accepted -- false ironwort
  Hyptis emoryi Torr. -- accepted -- desert lavender
  Hyptis escobilla Urb. -- accepted -- bayamon
  Hyptis lantanifolia Poit. -- accepted -- island bushmint
  Hyptis mutabilis (Rich.) Briq. -- accepted -- tropical bushmint
  Hyptis mutabilis var. spicata (Poit.) Briq. -- not accepted
  Hyptis pectinata (L.) Poit. -- accepted -- comb hyptis, fausse menthe, mint weed, mumutun lahe, purple top, timothi ni vavalangi, comb bushmint
  Hyptis radiata Willd. -- not accepted
  Hyptis scoparia Poit. -- not accepted
  Hyptis spicigera Lam. -- accepted -- marubio
  Hyptis suaveolens (L.) Poit. -- accepted -- mumutun, wild spikenard, pignut
  Hyptis verticillata Jacq. -- accepted -- John Charles
  Hyssopus L. -- accepted
  Hyssopus officinalis L. -- accepted -- hyssop
  Ibicella Van Eselt. -- accepted -- yellow unicorn-plant
  Ibicella lutea (Lindl.) Van Eselt. -- accepted -- yellow unicorn-plant
  Ilysanthes Raf. -- not accepted
  Ilysanthes anagallidea (Michx.) B.L. Rob. -- not accepted
  Ilysanthes attenuata (Spreng.) Small -- not accepted
  Ilysanthes dubia (L.) Barnhart -- not accepted
  Ilysanthes grandiflora (Nutt.) Benth. -- not accepted
  Ilysanthes inequalis (Walter) Pennell -- not accepted
  Ilysanthes monticola (Nutt.) Raf. -- not accepted
  Ilysanthes saxicola (M.A. Curtis) Chapm. -- not accepted
  Incarvillea Juss. -- accepted
  Incarvillea delavayi Bureau & Franch. -- accepted
  Incarvillea olgae Regel -- accepted
  Isanthus Michx. -- not accepted -- fluxweed
  Isanthus brachiatus (L.) Britton, Sterns & Poggenb. -- not accepted -- false pennyroyal, fluxweed
  Isanthus brachiatus var. linearis Fassett -- not accepted
  Jacaranda Juss. -- accepted -- jacaranda
  Jacaranda acutifolia auct. non Humb. & Bonpl. -- not accepted
  Jacaranda mimosifolia D. Don -- accepted -- black poui
  Jacobinia candicans (Nees) Benth. & Hook. f. -- not accepted
  Jacobinia carnea (Lindl.) G. Nicholson -- not accepted
  Jacobinia ovata A. Gray -- not accepted
  Jasminum L. -- accepted -- jasmine
  Jasminum amplexicaule Buch.-Ham. ex G. Don -- not accepted
  Jasminum azoricum auct. non L. -- not accepted
  Jasminum dichotomum Vahl -- accepted -- Gold Coast jasmine
  Jasminum elongatum (P.J. Bergius) Willd. -- accepted -- earleaf jasmine
  Jasminum fluminense Vell. -- accepted -- Brazilian jasmine, jazmin de trapo
  Jasminum grandiflorum L. -- accepted
  Jasminum laurifolium Roxb. -- accepted
  Jasminum marianum DC. -- accepted
  Jasminum mesnyi Hance -- accepted -- Japanese jasmine
  Jasminum multiflorum (Burm. f.) Andrews -- accepted -- star jasmine
  Jasminum nitidum Skan -- accepted -- angelwing jasmine
  Jasminum nudiflorum Lindl. -- accepted -- winter jasmine
  Jasminum officinale L. -- accepted -- poet's jasmine
  Jasminum officinale var. grandiflorum (L.) L.H. Bailey -- not accepted
  Jasminum primulinum Hemsl. -- not accepted
  Jasminum pubescens (Retz.) Willd. -- not accepted
  Jasminum sambac (L.) Aiton -- accepted -- pikake, Arabian jasmine
  Jasminum undulatum Ker Gawl. -- not accepted
  Justica paniculata Burm. f. -- not accepted
  Justicia L. -- accepted -- water-willow
  Justicia adhatoda L. -- accepted -- Malabar nut
  Justicia americana (L.) Vahl -- accepted -- spike justica, common water-willow, carmantine d'Amérique, American water-willow
  Justicia americana var. subcoriacea Fernald -- not accepted
  Justicia androsaemifolia (Nees) Lindau -- accepted
  Justicia angusta (Chapm.) Small -- accepted -- pineland water-willow
  Justicia assurgens L. -- not accepted
  Justicia betonica L. -- accepted -- squirrel's tail
  Justicia borinquensis Britton -- not accepted -- Monte Cerrote water-willow
  Justicia brachiata Pursh -- not accepted
  Justicia brandegeeana Wassh. & L.B. Sm. -- accepted -- shrimpplant
  Justicia brunelloides Lam. -- not accepted
  Justicia californica (Benth.) D.N. Gibson -- accepted -- beloperone
  Justicia candicans (Nees) L.D. Benson -- accepted -- jacobina, Arizona water-willow
  Justicia candicans var. subglabra (S. Watson) L.D. Benson -- not accepted
  Justicia carnea Lindl. -- accepted -- Brazilian-plume
  Justicia carthagenensis Jacq. -- accepted -- woodland water-willow
  Justicia carthaginensis Jacq. -- not accepted
  Justicia comata (L.) Lam. -- accepted -- marsh water-willow
  Justicia cooleyi Monach. & Leonard -- accepted -- Cooley's water-willow
  Justicia crassifolia (Chapm.) Chapm. ex Small -- accepted -- thick-leaved water-willow, thickleaf water-willow
  Justicia culebritae Urb. -- accepted -- Culebrita Island water-willow
  Justicia echioides L. -- not accepted
  Justicia gangetica L. -- not accepted
  Justicia humilis Michx. -- not accepted
  Justicia imbricata Vahl -- not accepted
  Justicia laetevirens Buckley -- not accepted
  Justicia lanceolata (Chapm.) Small -- not accepted
  Justicia longii Hilsenb. -- accepted -- longflower tube tongue
  Justicia martinicensis Jacq. -- not accepted
  Justicia martinsoniana R.A. Howard -- accepted -- Puerto Rico water-willow
  Justicia mirabiloides Lam. -- accepted -- West Indian water-willow
  Justicia mortuifluminis Fernald -- not accepted
  Justicia nitida Jacq. -- not accepted
  Justicia ovata (Walter) Lindau -- accepted -- looseflower waterwillow, looseflower water-willow
  Justicia ovata var. angusta (Chapm.) R.W. Long -- not accepted
  Justicia ovata var. lanceolata (Chapm.) R.W. Long -- accepted -- loose justica, looseflower water-willow
  Justicia ovata var. ovata (Walter) Lindau -- accepted -- looseflower water-willow
  Justicia pectoralis Jacq. -- accepted -- freshcut
  Justicia periplocifolia auct. non Jacq. -- not accepted -- tropical waterwillow
  Justicia pilosella (Nees) Hilsenb. -- accepted -- Gregg's tube tongue
  Justicia quadrifida Vahl -- not accepted
  Justicia resupinata Vahl -- not accepted
  Justicia runyonii Small -- accepted -- Runyon's waterwillow, Runyon's water-willow
  Justicia secunda Vahl -- accepted
  Justicia sessilis Jacq. -- not accepted
  Justicia sonorae Wassh. -- accepted -- Sonoran water-willow
  Justicia sphaerosperma Vahl. -- accepted -- tropical waterwillow
  Justicia spicata Ruiz & Pav. -- not accepted
  Justicia spicigera Schltdl. -- accepted -- mohintli
  Justicia spinosa Jacq. -- not accepted
  Justicia tobagensis (Urb.) Wassh. -- accepted
  Justicia turneri Hilsenb. -- accepted -- Turner's water-willow
  Justicia umbratilis Fernald -- not accepted
  Justicia veracruzana T.F. Daniel -- accepted
  Justicia verticillaris (Nees) Urb. -- not accepted
  Justicia warnockii B.L. Turner -- accepted -- Warnock's waterwillow, Warnock's water-willow
  Justicia wrightii A. Gray -- accepted -- Wright's water-willow
  Keckiella Straw -- accepted
  Keckiella antirrhinoides (Benth.) Straw -- accepted -- snapdragon penstemon, chaparral bush-beardtongue
  Keckiella antirrhinoides ssp. antirrhinoides (Benth.) Straw -- accepted -- snapdragon penstemon
  Keckiella antirrhinoides ssp. microphylla (A. Gray) Straw -- accepted -- snapdragon penstemon, bush penstemon
  Keckiella antirrhinoides var. antirrhinoides (Benth.) Straw -- not accepted
  Keckiella antirrhinoides var. microphylla (A. Gray) N.H. Holmgren -- not accepted
  Keckiella breviflora (Lindl.) Straw -- accepted -- gaping beardtongue, bush beardtongue
  Keckiella breviflora ssp. breviflora (Lindl.) Straw -- accepted -- bush beardtongue
  Keckiella breviflora ssp. glabrisepala (D.D. Keck) Straw -- accepted -- bush beardtongue
  Keckiella breviflora var. breviflora (Lindl.) Straw -- not accepted
  Keckiella breviflora var. glabrisepala (D.D. Keck) N.H. Holmgren -- not accepted
  Keckiella cordifolia (Benth.) Straw -- accepted -- heartleaf keckiella
  Keckiella corymbosa (Benth.) Straw -- accepted -- redwood keckiella
  Keckiella lemmonii (A. Gray) Straw -- accepted -- Lemmon's keckiella, bush beardtongue
  Keckiella rothrockii (A. Gray) Straw -- accepted -- Rothrock's penstemon, Rothrock's keckiella
  Keckiella rothrockii ssp. jacintensis (Abrams) Straw -- accepted -- Rothrock's keckiella
  Keckiella rothrockii ssp. rothrockii (A. Gray) Straw -- accepted -- Rothrock's keckiella, Rothrock's penstemon
  Keckiella rothrockii var. jacintensis (Abrams) N.H. Holmgren -- not accepted
  Keckiella rothrockii var. rothrockii (A. Gray) Straw -- not accepted
  Keckiella ternata (Torr. ex A. Gray) Straw -- accepted -- scarlet keckiella
  Keckiella ternata ssp. septentrionalis (Munz & I.M. Johnst.) Straw -- accepted -- scarlet keckiella
  Keckiella ternata ssp. ternata (Torr. ex A. Gray) Straw -- accepted -- scarlet keckiella
  Keckiella ternata var. septentrionalis (Munz & I.M. Johnst.) N.H. Holmgren -- not accepted
  Keckiella ternata var. ternata (Torr. ex A. Gray) Straw -- not accepted
  Kickxia Dumort. -- accepted -- cancerwort
  Kickxia elatine (L.) Dumort. -- accepted -- sharpleaf cancerwort, cancerwort, fluvellin, roundleaf fluvellin, sharppoint fluvellin
  Kickxia spuria (L.) Dumort. -- accepted -- roundleaf cancerwort
  Kigelia DC. -- accepted -- sausage tree
  Kigelia africana (Lam.) Benth. -- accepted -- sausage tree
  Kigelia pinnata (Jacq.) DC. -- not accepted
  Koellia albescens (Torr. & A. Gray) Kuntze -- not accepted
  Koellia aristata (Michx.) Kuntze -- not accepted
  Koellia beadlei Small -- not accepted
  Koellia clinopodioides (Torr. & A. Gray) Kuntze -- not accepted
  Koellia curvipes Greene -- not accepted
  Koellia dubia (A. Gray) Small -- not accepted
  Koellia flexuosa auct. non (Walter) MacMill. -- not accepted
  Koellia hugeri Small -- not accepted
  Koellia hyssopifolia (Benth.) Britton -- not accepted
  Koellia incana (L.) Kuntze -- not accepted
  Koellia leptodon (A. Gray) Small -- not accepted
  Koellia montana (Michx.) Kuntze -- not accepted
  Koellia multiflora Small -- not accepted
  Koellia mutica (Michx.) Kuntze -- not accepted
  Koellia nuda (Nutt.) Kuntze -- not accepted
  Koellia pauciflora Small -- not accepted
  Koellia pilosa (Nutt.) Britton -- not accepted
  Koellia pycnanthemoides (Leavenw.) Kuntze -- not accepted
  Koellia verticillata (Michx.) Kuntze -- not accepted
  Koellia virginiana (L.) MacMill. -- not accepted
  Kohleria Regel -- accepted
  Kohleria eriantha (Benth.) Hanst. -- not accepted
  Kopsiopsis Beck -- accepted
  Kopsiopsis hookeri (Walp.) Govaerts -- accepted -- Vancouver groundcone
  Kopsiopsis strobilacea (A. Gray) Beck -- accepted -- California groundcone
  Lagotis Gaertn. -- accepted
  Lagotis glauca Gaertn. -- accepted -- weaselsnout
  Lagotis glauca ssp. glauca Gaertn. -- accepted -- weaselsnout
  Lagotis glauca ssp. lanceolata (Hultén) D.F. Murray & Elven -- accepted -- little weaselsnout
  Lagotis glauca ssp. minor (Willd.) Hultén -- not accepted
  Lagotis glauca var. glauca Gaertn. -- not accepted
  Lagotis glauca var. stelleri (Cham. & Schltdl.) Trautv. -- not accepted
  Lagotis minor (Willd.) Standl. -- not accepted -- little weaselsnout
  Lagotis stelleri (Cham. & Schltdl.) Raup -- not accepted
  Lallemantia Fisch. & C.A. Mey. -- accepted
  Lallemantia peltata (L.) Fisch. & C.A. Mey. -- accepted -- lion's heart
  Lamiaceae -- accepted -- mints, menthes
  Lamiales -- accepted
  Lamiastrum Heist. ex Fabr. -- not accepted
  Lamiastrum galeobdolon (L.) Ehrend. & Polatschek -- not accepted -- yellow archangel
  Lamium L. -- accepted -- deadnettle
  Lamium album L. -- accepted -- white deadnettle
  Lamium album var. maculatum L. -- not accepted
  Lamium amplexicaule L. -- accepted -- common henbit, henbit, giraffehead, henbit deadnettle
  Lamium amplexicaule var. album Pickens & M.C. Pickens -- not accepted
  Lamium confertum Fr. -- accepted -- garden henbit
  Lamium dissectum With. -- not accepted
  Lamium galeobdolon (L.) L. -- accepted -- yellow archangel
  Lamium hybridum auct. non Vill. -- not accepted -- hybrid deadnettle
  Lamium maculatum L. -- accepted -- spotted henbit
  Lamium moluccellaefolium Fr. -- not accepted
  Lamium moluccellifolium Fr. -- not accepted
  Lamium purpureum L. -- accepted -- red deadnettle, purple deadnettle
  Lamium purpureum var. incisum (Willd.) Pers. -- accepted -- hybrid deadnettle, red deadnettle, purple deadnettle
  Lamium purpureum var. purpureum L. -- accepted -- purple deadnettle
  Lantana L. -- accepted
  Lantana achyranthifolia Desf. -- accepted -- brushland shrub-verbena, brushland shrubverbena
  Lantana aculeata L. -- not accepted
  Lantana alba Mill. -- not accepted
  Lantana arida Britton -- not accepted
  Lantana bahamensis auct. non Britton -- not accepted
  Lantana bahamensis var. floridana Moldenke -- not accepted
  Lantana camara L. -- accepted -- largeleaf lantana
  Lantana camara var. aculeata (L.) Moldenke -- not accepted
  Lantana camara var. flava (Medik.) Moldenke -- not accepted
  Lantana camara var. hybrida (Neubert) Moldenke -- not accepted
  Lantana camara var. mista (L.) L.H. Bailey -- not accepted
  Lantana camara var. mutabilis (Hook.) L.H. Bailey -- not accepted
  Lantana camara var. nivea (Vent.) L.H. Bailey -- not accepted
  Lantana camara var. sanguinea (Medik.) L.H. Bailey -- not accepted
  Lantana canescens Kunth -- accepted -- hammock shrubverbena
  Lantana depressa Small -- accepted -- depressed shrubverbena
  Lantana depressa var. depressa Small -- accepted -- depressed shrubverbena
  Lantana depressa var. floridana (Moldenke) R.W. Sanders -- accepted -- Florida shrubverbena
  Lantana depressa var. sanibelensis R.W. Sanders -- accepted -- Sanibel shrubverbena
  Lantana exarata Urb. & Ekman -- accepted -- Caribbean shrubverbena
  Lantana frutilla Moldenke -- not accepted
  Lantana fucata Lindl. -- accepted
  Lantana fucata var. antillana Moldenke -- not accepted
  Lantana glandulosissima Hayek -- not accepted
  Lantana hirta auct. non Graham -- not accepted
  Lantana hispida auct. non Kunth -- not accepted
  Lantana horrida sensu Moldenke, non Kunth -- not accepted
  Lantana horrida Kunth -- accepted
  Lantana horrida var. latibracteata Moldenke -- not accepted
  Lantana insularis Moldenke -- accepted -- island lantana
  Lantana involucrata L. -- accepted -- buttonsage
  Lantana involucrata var. involucrata L. -- accepted -- buttonsage
  Lantana involucrata var. odorata (L.) Moldenke -- accepted -- fragrant buttonsage
  Lantana macropoda Torr. -- not accepted
  Lantana microcephala A. Rich. -- not accepted
  Lantana montevidensis (Spreng.) Briq. -- accepted -- trailing shrubverbena
  Lantana notha Moldenke -- not accepted
  Lantana ovatifolia auct. non Britton. -- not accepted
  Lantana ovatifolia var. reclinata R.W. Long -- not accepted
  Lantana reticulata Pers. -- accepted -- netted shrubverbena
  Lantana scorta Moldenke -- not accepted
  Lantana sellowiana Link & Otto -- not accepted
  Lantana strigocamara R.W. Sanders -- not accepted
  Lantana strigosa (Griseb.) Urb. -- accepted -- rough shrubverbena
  Lantana tiliifolia auct. non Cham. -- not accepted
  Lantana trifolia L. -- accepted -- threeleaf shrubverbena
  Lantana urticifolia Mill. -- not accepted -- nettleleaf shrubverbena
  Lantana urticifolia ssp. moldenkei R.W. Sanders -- not accepted -- nettleleaf shrubverbena
  Lantana urticifolia ssp. urticifolia Mill. -- not accepted -- nettleleaf shrubverbena
  Lantana urticoides Hayek -- not accepted -- western lantana, West Indian shrubverbena
  Lantana urticoides var. hispidula Moldenke -- not accepted
  Lantana velutina M. Martens & Galeotti -- accepted -- velvet shrubverbena
  Lavandula L. -- accepted -- lavender
  Lavandula angustifolia Mill. -- accepted -- English lavender
  Lavandula latifolia Medik. -- accepted -- broadleaved lavender
  Lavandula officinalis Chaix -- not accepted
  Lavandula spica L. -- not accepted
  Lavandula stoechas L. -- accepted -- French lavender
  Lavandula vera DC. -- not accepted
  Lavandula X intermedia Emeric ex Loisel. -- accepted -- lavandin
  Lecticula resupinata (B.D. Greene ex Bigelow) Barnhart -- not accepted
  Leiostemon ambiguus (Torr.) Greene -- not accepted
  Lendneria Minod -- not accepted
  Lendneria verticillata (Mill.) Britton -- not accepted
  Lentibulariaceae -- accepted -- bladderworts
  Leonotis (Pers.) R. Br. -- accepted -- lion's ear
  Leonotis leonurus (L.) R. Br. -- accepted -- lion's ear
  Leonotis nepetifolia (L.) R. Br. -- accepted -- Christmas candlestick
  Leonurus L. -- accepted -- motherwort
  Leonurus artemisia auct. non Lour. -- not accepted
  Leonurus cardiaca L. -- accepted -- motherwort, common motherwort
  Leonurus cardiaca ssp. cardiaca L. -- accepted -- common motherwort
  Leonurus cardiaca ssp. villosus (Desf. ex Spreng.) Hyl. -- not accepted -- common motherwort
  Leonurus cardiaca var. villosus (Desf. ex Spreng.) Benth. -- not accepted
  Leonurus japonicus Houtt. -- accepted -- honeyweed
  Leonurus marrubiastrum L. -- not accepted -- lion's tail
  Leonurus sibiricus L. -- accepted -- honeyweed
  Lepechinia Willd. -- accepted -- pitchersage
  Lepechinia calycina (Benth.) Epling -- accepted -- woodbalm
  Lepechinia cardiophylla Epling -- accepted -- heart-leaved pitcher-sage, Santa Ana pitchersage
  Lepechinia fragrans (Greene) Epling -- accepted -- island pitchersage
  Lepechinia ganderi Epling -- accepted -- San Diego pitchersage, Gander's pitcher-sage
  Lepechinia hastata (A. Gray) Epling -- accepted -- pakaha
  Lepechinia rossii S. Boyd & Mistrata -- accepted
  Lepidagathis alopecuroidea (Vahl) R. Br. ex Griseb. -- accepted -- pata de gallina
  Lepidagathis alopecuroides (Vahl) R. Br. ex Griseb. -- not accepted
  Leptamnium virginianum (L.) Raf. -- not accepted
  Leptandra virginica (L.) Nutt. -- not accepted
  Leucas R. Br. -- accepted
  Leucas martinicensis (Jacq.) W.T. Aiton -- accepted -- whitewort
  Leucophyllum Humb. & Bonpl. -- accepted -- barometerbush
  Leucophyllum candidum I.M. Johnst. -- accepted -- Brewster County barometerbush
  Leucophyllum frutescens (Berland.) I.M. Johnst. -- accepted -- Texas barometer bush, cenizo
  Leucophyllum minus A. Gray -- accepted -- big bend cenizo, Big Bend barometerbush
  Leucophyllum violaceum Pennell -- not accepted
  Leucophyllum zygophyllum I.M. Johnst. -- accepted -- cimmeron
  Leucospora Nutt. -- accepted
  Leucospora multifida (Michx.) Nutt. -- accepted -- narrowleaf paleseed
  Ligustrum L. -- accepted -- privet
  Ligustrum acuminatum Koehne -- not accepted
  Ligustrum amurense Carričre -- accepted -- Amur privet
  Ligustrum ibota Siebold -- accepted
  Ligustrum japonica Thunb. -- not accepted -- Japanese privet
  Ligustrum japonicum Thunb. -- accepted -- Japanese privet
  Ligustrum lucidum W.T. Aiton -- accepted -- tree privet, glossy privet
  Ligustrum microcarpum Kaneh. & Sasaki -- not accepted
  Ligustrum obtusifolium Siebold & Zucc. -- accepted -- border privet
  Ligustrum ovalifolium Hassk. -- accepted -- California privet
  Ligustrum quihoui Carričre -- accepted -- waxyleaf privet
  Ligustrum robustum (Roxb.) Blume -- accepted -- wild privet
  Ligustrum sempervirens (Franch.) Lingelsh. -- accepted -- privet
  Ligustrum sinense Lour. -- accepted -- common Chinese privet, Chinese privet
  Ligustrum tschonoskii Decne. -- accepted -- Tschonosky privet
  Ligustrum villosum May -- not accepted
  Ligustrum vulgare L. -- accepted -- wild privet, European privet
  Limnophila R. Br. -- accepted -- marshweed
  Limnophila aromatica (Lam.) Merr. -- accepted -- limnophila
  Limnophila fragrans Seem. -- accepted -- limnophila
  Limnophila indica (L.) Druce -- accepted -- Indian marshweed
  Limnophila sessiliflora (Vahl) Blume -- accepted -- ambulia, Asian marshweed
  Limnophila X ludoviciana Thieret -- accepted -- marshweed
  Limosella L. -- accepted -- mudwort
  Limosella acaulis Sessé & Moc. -- accepted -- Owyhee mudwort
  Limosella aquatica L. -- accepted -- water mudwort, awlleaf mudwort, awl-leaf mudwort, northern mudwort
  Limosella aquatica var. tenuifolia Hoffm. -- not accepted
  Limosella australis R. Br. -- accepted -- Welsh mudwort
  Limosella pubiflora Pennell -- accepted -- Chiricahua Mountain mudwort, Chiricahua mudwort
  Limosella subulata E. Ives -- not accepted
  Linaria Mill. -- accepted -- toadflax
  Linaria aeruginea (Gouan) Cav. -- accepted -- roadside toadflax
  Linaria angustissima Borbás -- accepted -- Italian toadflax
  Linaria bipartita (Vent.) Willd. -- accepted -- clovenlip toadflax
  Linaria canadensis (L.) Dum. Cours. -- not accepted -- Canada toadflax
  Linaria canadensis var. texana (Scheele) Pennell -- not accepted
  Linaria cymbalaria (L.) Mill. -- not accepted
  Linaria dalmatica (L.) Mill. -- accepted -- Dalmatian toadflax, Dalmation toadflax
  Linaria dalmatica ssp. dalmatica (L.) Mill. -- accepted -- Dalmatian toadflax, Dalmation toadflax
  Linaria dalmatica ssp. macedonica (Griseb.) D.A. Sutton -- accepted -- Dalmatian toadflax, Dalmation toadflax
  Linaria dalmatica var. macedonica (Griseb.) Vandas -- not accepted
  Linaria elatine (L.) Mill. -- not accepted
  Linaria floridana Chapm. -- not accepted
  Linaria genistifolia (L.) Mill. -- accepted -- broomleaf toadflax
  Linaria genistifolia ssp. dalmatica (L.) Maire & Petitm. -- not accepted -- Dalmatian toadflax
  Linaria genistifolia ssp. genistifolia (L.) Mill. -- accepted -- broomleaf toadflax
  Linaria genistifolia var. genistifolia (L.) Mill. -- not accepted
  Linaria granidflora Desf. -- accepted
  Linaria incarnata (Vent.) Spreng. -- accepted -- crimson toadflax
  Linaria italica Trevir. -- not accepted
  Linaria jattae Palanza -- not accepted
  Linaria linaria (L.) H. Karst. -- not accepted
  Linaria macedonica Griseb. -- not accepted
  Linaria maroccana Hook. f. -- accepted -- Moroccan toadflax
  Linaria pinifolia (Poir.) Thell. -- accepted -- pineneedle toadflax
  Linaria purpurea (L.) Mill. -- accepted -- purple toadflax
  Linaria repens (L.) Mill. -- accepted -- striped toadflax
  Linaria reticulata (Sm.) Desf. -- accepted -- purplenet toadflax
  Linaria spartea (L.) Chaz. -- accepted -- ballast toadflax
  Linaria supina (L.) Chaz. -- accepted -- lesser butter and eggs
  Linaria supina ssp. supina (L.) Chaz. -- accepted -- lesser butter and eggs
  Linaria texana Scheele -- not accepted
  Linaria vulgaris Mill. -- accepted -- butter and eggs, greater butter-and-eggs, yellow toadflax, flaxweed, Jacob's ladder, ramsted, wild snapdragon
  Linaria X hybrida Schur -- accepted
  Linaria X sepium J.G. Allm. -- accepted -- toadflax
  Lindernia All. -- accepted -- false pimpernel
  Lindernia anagallidea (Michx.) Pennell -- not accepted
  Lindernia antipoda (L.) Alston -- accepted -- sparrow false pimpernel
  Lindernia brucei Howard -- accepted
  Lindernia ciliata (Colsmann) Pennell -- accepted -- fringed false pimpernel
  Lindernia crustacea (L.) F. Muell. -- accepted -- Malaysian false pimpernel
  Lindernia crustacea var. smithii O. Deg., I. Deg. & G.C. Ruhle -- not accepted
  Lindernia diffusa (L.) Wettst. -- accepted -- spreading false pimpernel
  Lindernia dubia (L.) Pennell -- accepted -- moistbank pimpernel, yellow-seed false pimpernel, shortstalk lindernia, yellowseed false pimpernel
  Lindernia dubia var. anagallidea (Michx.) Cooperr. -- not accepted -- yellow-seed false pimpernel, false pimpernel, yellowseed false pimpernel
  Lindernia dubia var. dubia (L.) Pennell -- not accepted -- yellowseed false pimpernel, yellow-seed false pimpernel
  Lindernia dubia var. inundata (Pennell) Pennell -- not accepted -- false pimpernel, lindernie litigieuse variété estuarienne, yellowseed false pimpernel
  Lindernia dubia var. major (Pursh) Pennell -- not accepted
  Lindernia dubia var. riparia (Raf.) Fernald -- not accepted
  Lindernia dubia var. typica Pennell -- not accepted
  Lindernia grandiflora Nutt. -- accepted -- savannah false pimpernel
  Lindernia monticola Nutt. -- accepted -- piedmont false pimpernel
  Lindernia procumbens auct. non (Knock.) Borb. -- not accepted
  Lindernia procumbens (Krock.) Philcox -- accepted -- prostrate false pimpernel
  Lindernia pyxidaria auct. non L. -- not accepted
  Lindernia saxicola M.A. Curtis -- not accepted
  Lindernia verticillata (Mill.) Britton -- not accepted
  Linderniaceae -- accepted
  Linociera Sw. ex Schreb. -- not accepted
  Linociera axilliflora Griseb. -- not accepted
  Linociera caribaea (Jacq.) Knobl. -- not accepted
  Linociera domingensis (Lam.) Knobl. -- not accepted
  Linociera holdridgei Camp & Monach. -- not accepted
  Linociera holdridgii Camp & Monach. -- not accepted
  Linociera ligustrina Sw. -- not accepted
  Linociera lingustrina (Sw.) Sw. -- not accepted
  Lippia L. -- accepted
  Lippia alba (Mill.) N.E. Br. ex Britton & P. Wilson -- accepted -- white lippia, bushy lippia
  Lippia canescens Kunth -- not accepted
  Lippia citriodora Kunth -- not accepted
  Lippia citrodora Kunth -- not accepted
  Lippia cuneifolia (Torr.) Steud. -- not accepted
  Lippia dulcis Trevir. -- not accepted
  Lippia geminata Kunth -- not accepted
  Lippia graveolens Kunth -- accepted -- scented lippia, scented matgrass, Mexican oregano
  Lippia helleri Britton -- not accepted
  Lippia incisa (Small) Tidestr. -- not accepted
  Lippia lanceolata Michx. -- not accepted
  Lippia lanceolata var. recognita Fernald & Griscom -- not accepted
  Lippia ligustrina (Lag.) Britton -- not accepted
  Lippia lycioides (Cham.) Steud. -- not accepted
  Lippia micromera Schauer -- accepted -- Spanish thyme
  Lippia micromera var. helleri (Britton) Moldenke -- accepted -- Spanish thyme
  Lippia montevidensis Spreng. -- not accepted
  Lippia nodiflora (L.) Michx. -- not accepted
  Lippia nodiflora var. canescens (Kunth) Kuntze -- not accepted
  Lippia nodiflora var. reptans (Kunth) Kuntze -- not accepted
  Lippia nodiflora var. rosea (D. Don) Munz -- not accepted
  Lippia reptans Kunth -- not accepted
  Lippia stoechadifolia (L.) Kunth -- not accepted -- southern frogfruit, southern fogfruit
  Lippia strigulosa M. Martens & Galeotti -- not accepted
  Lippia triphylla (L'Hér.) Kuntze -- not accepted
  Lippia wrightii A. Gray -- not accepted
  Littorella P.J. Bergius -- accepted
  Littorella americana Fernald -- not accepted
  Littorella uniflora Asch. -- accepted -- American shoreweed
  Littorella uniflora var. americana (Fernald) Gleason -- not accepted
  Lophospermum D. Don -- accepted
  Lophospermum erubescens D. Don -- accepted -- Mexican twist
  Lycopus L. -- accepted -- water horehound, waterhorehound
  Lycopus americanus Muhl. ex W.P.C. Bartram -- accepted -- waterhorehound, cut-leaf water-horehound, American bugleweed, water horehound, American waterhorehound, American water horehound
  Lycopus americanus var. laurentianus (Roll.-Germ.) B. Boivin -- not accepted -- lycope d'Amérique variété du Saint-Laurent
  Lycopus americanus var. longii Benner -- not accepted
  Lycopus americanus var. scabrifolius Fernald -- not accepted
  Lycopus amplectens Raf. -- accepted -- clasping water horehound
  Lycopus amplectens var. pubens (Britton) Fernald -- not accepted
  Lycopus angustifolius Elliott -- accepted
  Lycopus asper Greene -- accepted -- rough water-horehound, rough bugleweed
  Lycopus cokeri H.E. Ahles ex Sorrie -- accepted -- Carolina water horehound
  Lycopus diantherus Buch.-Ham. ex Roxb. -- not accepted
  Lycopus europaeus L. -- accepted -- gypsywort
  Lycopus europaeus ssp. mollis (Kern.) Rothm. ex Skalický -- not accepted
  Lycopus europaeus var. mollis (Kern.) Briq. -- not accepted
  Lycopus laurentianus Roll.-Germ. -- accepted -- St. Lawrence waterhorehound
  Lycopus lucidus auct. non Turcz. ex Benth. -- not accepted
  Lycopus lucidus ssp. americanus (A. Gray) Hultén -- not accepted
  Lycopus lucidus var. americanus A. Gray -- not accepted
  Lycopus pubens Britton -- not accepted
  Lycopus rubellus Moench -- accepted -- taperleaf bugleweed, taperleaf water horehound
  Lycopus rubellus var. angustifolius (Elliott) H.E. Ahles -- not accepted
  Lycopus rubellus var. arkansanus (Fresen.) Benner -- not accepted
  Lycopus rubellus var. lanceolatus Benner -- not accepted
  Lycopus sessilifolius A. Gray -- not accepted
  Lycopus sinuatus Elliott -- not accepted
  Lycopus uniflorus Michx. -- accepted -- oneflower bugleweed, bugleweed, northern water-horehound, northern bugleweed
  Lycopus uniflorus var. ovatus Fernald & H. St. John -- accepted -- northern bugleweed
  Lycopus uniflorus var. uniflorus Michx. -- accepted -- northern bugleweed
  Lycopus velutinus Rydb. -- not accepted
  Lycopus virginicus L. -- accepted -- lycope de Virginie, Virginia bugleweed, Virginia water horehound
  Lycopus virginicus var. pauciflorus Benth. -- not accepted
  Lycopus X sherardii Steele (pro. sp.) -- accepted -- Sherard's waterhorehound
  Lysimachia monnieri L. -- not accepted
  Mabrya Elisens -- accepted
  Mabrya acerifolia (Pennell) Elisens -- accepted -- brittlestem
  Macbridea Elliott -- accepted
  Macbridea alba Chapm. -- accepted -- white birds-in-a-nest
  Macbridea caroliniana (Walter) S.F. Blake -- accepted -- Carolina birds-in-a-nest
  Macbridea pulchra Elliott -- not accepted
  Macfadyena A. DC. -- accepted
  Macfadyena uncata (Andrews) Sprague & Sandwith -- accepted
  Macfadyena unguis-cati (L.) A.H. Gentry -- not accepted -- claw vine, catclaw vine
  Macranthera Nutt. ex Benth. -- accepted
  Macranthera flammea (W. Bartram) Pennell -- accepted -- flameflower
  Macuillamia obovata Raf. -- not accepted
  Macuillamia repens (Sw.) Pennell -- not accepted
  Macuillamia rotundifolia (Michx.) Raf. -- not accepted
  Majorana hortensis Moench -- not accepted
  Majorana majorana (L.) H. Karst. -- not accepted
  Majorana onites (L.) Benth. -- not accepted
  Mansoa DC. -- accepted -- garlicvine
  Mansoa alliacea (Lam.) A.H. Gentry -- accepted -- garlicvine
  Mansoa hymenacea (DC.) A.H. Gentry -- not accepted -- membranous garlicvine
  Mappia origanoides (L.) House -- not accepted
  Markhamia Seem. ex Baill. -- accepted
  Markhamia hildebrantii (Baker) Sprague -- not accepted
  Markhamia lutea (Benth.) K. Schum. -- accepted -- siala
  Marrubium L. -- accepted -- horehound
  Marrubium candidissimum L. -- not accepted
  Marrubium incanum Desr. -- accepted -- horehound
  Marrubium peregrinum L. -- accepted -- horehound
  Marrubium vulgare L. -- accepted -- white horehound, horehound
  Marsypianthes Mart. ex Benth. -- accepted
  Marsypianthes chamaedrys (Vahl) Kuntze -- accepted -- ortela
  Martinella Baill. -- accepted
  Martinella obovata (Kunth) Bureau & K. Schum. -- accepted
  Martynia L. -- accepted
  Martynia althaeifolia Benth. -- not accepted
  Martynia annua L. -- accepted -- una de gato
  Martynia arenaria Engelm. -- not accepted
  Martynia fragrans Lindl. -- not accepted
  Martynia louisiana Mill. -- not accepted
  Martynia louisianica Mill. -- not accepted
  Martynia lutea Lindl. -- not accepted
  Martynia parviflora Wooton -- not accepted
  Martynia proboscidea Gloxin -- not accepted
  Martyniaceae -- accepted
  Maurandella (A. Gray) Rothm. -- accepted
  Maurandella antirrhiniflora (Humb. & Bonpl. ex Willd.) Rothm. -- accepted -- roving sailor, climbing snapdragon
  Maurandella petrophila (Coville & C.V. Morton) Rothm. -- not accepted
  Maurandya Ortega -- accepted
  Maurandya acerifolia Pennell -- not accepted
  Maurandya antirrhiniflora Humb. & Bonpl. ex Willd. -- not accepted
  Maurandya barclaiana Lindl. -- accepted -- Mexican viper
  Maurandya petrophila Coville & C.V. Morton -- not accepted
  Maurandya wislizeni Engelm. ex A. Gray -- not accepted
  Maurandya wislizenii Engelm. ex A. Gray -- not accepted
  Mayepea axilliflora (Griseb.) Krug & Urb. -- not accepted
  Mayepea caribaea (Jacq.) Kuntze -- not accepted
  Mayepea domingensis (Lam.) Krug & Urb. -- not accepted
  Mazus Lour. -- accepted
  Mazus japonicus (Thunb.) Kuntze -- not accepted
  Mazus miquelii Makino -- accepted -- Miquel's mazus
  Mazus pumilus (Burm. f.) Steenis -- accepted -- Japanese mazus
  Mazus reptans N.E. Br. -- not accepted
  Mecardonia Ruiz & Pav. -- accepted
  Mecardonia acuminata (Walter) Small -- accepted -- axilflower
  Mecardonia acuminata var. acuminata (Walter) Small -- accepted -- axilflower
  Mecardonia acuminata var. microphylla (Raf.) Pennell -- accepted -- axilflower
  Mecardonia acuminata var. peninsularis Pennell -- accepted -- axilflower
  Mecardonia dianthera (Sw.) Pennell -- not accepted
  Mecardonia peduncularis (Benth.) Small -- not accepted
  Mecardonia procumbens (Mill.) Small -- accepted -- baby jump-up, baby jumpup
  Mecardonia tenuis Small -- not accepted
  Mecardonia vandellioides auct. non (Kunth) Pennell -- not accepted
  Meehania Britton -- accepted
  Meehania cordata (Nutt.) Britton -- accepted -- Meehan's mint
  Megaskepasma Lindau -- accepted -- Brazilian red-cloak
  Megaskepasma erythrochlamys Lindau -- accepted -- Brazilian red-cloak
  Melampyrum L. -- accepted -- cowwheat
  Melampyrum latifolium (W.P.C. Barton) Muhl. ex Britton & A. Br. -- not accepted
  Melampyrum lineare Desr. -- accepted -- narrowleaf cowwheat
  Melampyrum lineare var. americanum (Michx.) Beauverd -- not accepted
  Melampyrum lineare var. latifolium W.P.C. Barton -- accepted -- narrowleaf cowwheat
  Melampyrum lineare var. lineare Desr. -- accepted -- narrowleaf cowwheat
  Melampyrum lineare var. pectinatum (Pennell) Fernald -- accepted -- narrowleaf cowwheat
  Melasma melampyroides (Rich.) Pennell -- not accepted
  Melissa L. -- accepted -- balm
  Melissa officinalis L. -- accepted -- common balm
  Melissa pulegioides (L.) L. -- not accepted
  Menodora Bonpl. -- accepted -- twinberry
  Menodora decemfida (Gillies ex Hook. & Arn.) A. Gray -- accepted -- tenfinger menodora
  Menodora decemfida var. longifolia Steyerm. -- not accepted -- tenfinger menodora
  Menodora heterophylla Moric. ex DC. -- accepted -- low menodora
  Menodora longiflora A. Gray -- accepted -- showy menodora
  Menodora scabra A. Gray -- accepted -- rough menodora
  Menodora scabra var. glabrescens A. Gray -- not accepted
  Menodora scabra var. laevis (Wooton & Standl.) Steyerm. -- not accepted
  Menodora scabra var. longituba Steyerm. -- not accepted
  Menodora scabra var. ramosissima Steyerm. -- not accepted
  Menodora scabra var. scabra A. Gray -- not accepted -- rough menodora
  Menodora scoparia Engelm. ex A. Gray -- not accepted
  Menodora spinescens A. Gray -- accepted -- spiny menodora
  Menodora spinescens var. mohavensis Steyerm. -- not accepted
  Mentha L. -- accepted -- mint
  Mentha alopecuroides Hull -- not accepted
  Mentha aquatica L. -- accepted -- water mint
  Mentha aquatica var. crispa (L.) Benth. -- not accepted
  Mentha arvensis L. -- accepted -- field mint, wild mint
  Mentha arvensis ssp. borealis (Michx.) Roy L. Taylor & MacBryde -- not accepted
  Mentha arvensis ssp. haplocalyx Briq. -- not accepted
  Mentha arvensis var. canadensis (L.) Kuntze -- not accepted
  Mentha arvensis var. glabrata (Benth.) Fernald -- not accepted
  Mentha arvensis var. lanata Piper -- not accepted
  Mentha arvensis var. sativa auct. non Benth. -- not accepted
  Mentha arvensis var. villosa (Benth.) S.R. Stewart -- not accepted
  Mentha canadensis L. -- not accepted -- Canadian mint
  Mentha cardiaca J. Gerard ex Baker -- not accepted
  Mentha citrata Ehrh. -- not accepted
  Mentha cordifolia Lej. & Courtois auct. -- not accepted
  Mentha crispa L. -- not accepted
  Mentha dumetorum Schult. -- not accepted
  Mentha gentilis auct. non L. -- not accepted
  Mentha gentilis L. -- not accepted
  Mentha glabrior (Hook.) Rydb. -- not accepted
  Mentha longifolia auct. non (L.) Huds. -- not accepted
  Mentha longifolia var. mollissima (Borkh.) Rouy -- not accepted
  Mentha longifolia var. undulata (Willd.) Fiori -- not accepted
  Mentha nemorosa Willd. -- not accepted
  Mentha penardii (Briq.) Rydb. -- not accepted
  Mentha piperita ssp. citrata (Ehrh.) Briq. -- not accepted
  Mentha pulegium L. -- accepted -- peppermint, pennyroyal
  Mentha requienii Benth. -- accepted -- mint
  Mentha rotundifolia auct. non (L.) Huds. -- not accepted
  Mentha sativa L. -- not accepted
  Mentha spicata L. -- accepted -- bush mint, spearmint
  Mentha spicata var. longifolia L. -- not accepted
  Mentha spicata var. spicata L. -- not accepted -- spearmint
  Mentha suaveolens Ehrh. -- accepted -- bigleaf mint, mint, apple mint
  Mentha sylvestris L. -- not accepted
  Mentha viridis L. -- not accepted
  Mentha X gentilis L. -- not accepted -- red mint
  Mentha X gentilis var. cardiaca (J. Gerard ex Baker) B. Boivin (pro nm.) -- not accepted
  Mentha X gracilis Sole (pro. sp.) -- accepted -- gingermint
  Mentha X muelleriana auct. non F.W. Schultz -- not accepted
  Mentha X piperi var. citrata (Ehrh.) B. Boivin (pro nm.) -- not accepted
  Mentha X piperita L. (pro. sp.) -- accepted -- peppermint
  Mentha X piperita var. citrata (Ehrh.) Briq. -- not accepted -- lemon mint
  Mentha X piperita var. piperita L. -- not accepted -- peppermint
  Mentha X rotundifolia (L.) Huds. (pro. sp.) -- accepted -- bigleaf mint, mint
  Mentha X smithiana Graham -- accepted -- Smith's mint
  Mentha X verticillata L. -- accepted -- mint
  Mentha X verticillata var. peduncularis (Boreau) Rouy (pro nm.) -- not accepted
  Mentha X villosa Huds. (pro. sp.) -- accepted -- hairy mint
  Mentha X villosa var. alopecuroides (Hull) Briq. (pro nm.) -- not accepted
  Meyenia erecta Benth. -- not accepted
  Micheliella Briq. -- not accepted
  Micheliella anisata (Sims) Briq. -- not accepted
  Micheliella verticillata (Baldw.) Briq. -- not accepted
  Micranthemum Michx. -- accepted -- mudflower
  Micranthemum glomeratum (Chapm.) Shinners -- accepted -- manatee mudflower
  Micranthemum micranthemoides (Nutt.) Wettst. -- accepted -- Nuttall's mudflower, Nuttall's micranthemum
  Micranthemum umbrosum (J.F. Gmel.) S.F. Blake -- accepted -- shade mudflower
  Micromeria Benth. -- accepted
  Micromeria brownei (Sw.) Benth. -- not accepted -- Browne's savory
  Micromeria brownei var. pilosiuscula A. Gray -- not accepted -- Browne's savory
  Micromeria chamissonis (Benth.) Greene -- not accepted
  Micromeria pilosiuscula (A. Gray) Small -- not accepted
  Mimetanthe Greene -- not accepted
  Mimetanthe pilosa (Benth.) Greene -- not accepted -- false monkeyflower, false monkey-flower
  Mimulus L. -- accepted -- monkey-flower, monkeyflower
  Mimulus acutidens Greene -- accepted -- Kings River monkeyflower
  Mimulus alatus Aiton -- accepted -- sharpwing monkeyflower
  Mimulus alpinus (A. Gray) Piper -- not accepted
  Mimulus alsinoides Douglas ex Benth. -- accepted -- wingstem monkeyflower
  Mimulus ampliatus A.L. Grant -- not accepted
  Mimulus androsaceus Curran ex Greene -- accepted -- rockjasmine monkeyflower
  Mimulus angustatus (A. Gray) A. Gray -- accepted -- purplelip pansy monkeyflower
  Mimulus angustifolius (Greene) A.L. Grant -- accepted -- Mount Rose monkeyflower, Mt. Rose monkeyflower
  Mimulus arenarius A.L. Grant -- accepted -- sandloving monkeyflower
  Mimulus aridus (Abrams) A.L. Grant -- not accepted
  Mimulus arvensis Greene -- not accepted
  Mimulus atropurpureus Kellogg -- not accepted
  Mimulus aurantiacus Curtis -- not accepted
  Mimulus aurantiacus ssp. australis (McMinn) Munz -- not accepted
  Mimulus aurantiacus ssp. lompocensis (McMinn) Munz -- not accepted
  Mimulus aurantiacus var. aurantiacus Curtis -- not accepted
  Mimulus austiniae (Greene) A.L. Grant -- not accepted
  Mimulus bakeri Gand. -- not accepted
  Mimulus barbatus Greene -- accepted -- bearded monkeyflower
  Mimulus bicolor Hartw. ex Benth. -- accepted -- yellow and white monkeyflower
  Mimulus bifidus Pennell -- not accepted
  Mimulus bifidus ssp. fasciculatus Pennell -- not accepted
  Mimulus bigelovii (A. Gray) A. Gray -- accepted -- yellow-throat monkey-flower, Bigelow's monkeyflower
  Mimulus bigelovii var. bigelovii (A. Gray) A. Gray -- accepted -- Bigelow's monkeyflower
  Mimulus bigelovii var. cuspidatus A.L. Grant -- not accepted
  Mimulus bigelovii var. ovatus A. Gray -- not accepted
  Mimulus bigelovii var. panamintensis Munz -- accepted -- Panamint monkeyflower
  Mimulus biolettii Eastw. -- accepted -- Hetch Hetchy monkeyflower
  Mimulus bolanderi A. Gray -- accepted -- Bolander's monkeyflower
  Mimulus bolanderi var. brachydontus A.L. Grant -- not accepted
  Mimulus brachiatus Pennell -- accepted -- serpentine monkeyflower
  Mimulus brachystylis Edwin -- not accepted
  Mimulus brandegeei Pennell -- accepted -- Santa Cruz Island monkeyflower
  Mimulus breviflorus Piper -- accepted -- shortflower monkeyflower
  Mimulus brevipes A. Gray -- not accepted -- widethroat yellow monkeyflower
  Mimulus brevipes Benth. -- accepted -- widethroat yellow monkeyflower
  Mimulus breweri (Greene) Coville -- accepted -- Brewer's monkeyflower
  Mimulus caespitosus (Greene) Greene -- not accepted
  Mimulus caespitosus var. implexus (Greene) M. Peck -- not accepted
  Mimulus cardinalis auct. non Eastw. -- not accepted -- crimson monkeyflower
  Mimulus cardinalis Douglas ex Benth. -- accepted -- scarlet monkeyflower, scarlet monkey-flower, crimson monkeyflower
  Mimulus cardinalis var. exsul Greene -- not accepted
  Mimulus cardinalis var. griseus Greene -- not accepted
  Mimulus cardinalis var. rigens Greene -- not accepted
  Mimulus cardinalis var. verbenaceus (Greene) Kearney & Peebles -- not accepted
  Mimulus clarkii Kellogg ex Curran -- not accepted
  Mimulus cleistogamus J.T. Howell -- accepted -- selfing monkeyflower
  Mimulus clementinus Greene -- not accepted
  Mimulus clevelandii Brandegee -- not accepted
  Mimulus clivicola Greenm. -- accepted -- North Idaho monkeyflower, Bank monkey-flower
  Mimulus coccineus Congdon -- accepted -- Sierra monkeyflower, red monkeyflower
  Mimulus congdonii B.L. Rob. -- accepted -- Congdon's monkeyflower
  Mimulus constrictus (A.L. Grant) Pennell -- not accepted
  Mimulus corallinus Greene -- not accepted
  Mimulus cordatus Greene -- not accepted
  Mimulus cupreus hort. ex Dombrain -- accepted
  Mimulus cupriphilus M. Macnair -- accepted -- McNulty Mine monkeyflower
  Mimulus cusickii (Greene) Rattan -- accepted -- Cusick's monkeyflower
  Mimulus cuspidata Greene -- not accepted
  Mimulus decorus (A.L. Grant) Suksd. -- not accepted
  Mimulus decurtatus A.L. Grant -- not accepted
  Mimulus deflexus S. Watson -- not accepted
  Mimulus deltoideus Gand. -- not accepted
  Mimulus densus A.L. Grant -- accepted -- yellowandpurple monkeyflower, yellow and purple monkeyflower
  Mimulus dentatus Nutt. ex Benth. -- accepted -- coastal monkeyflower
  Mimulus dentatus var. gracilis A. Gray -- not accepted
  Mimulus dentilobus B.L. Rob. & Fernald -- accepted -- sharpwing monkeyflower, tooth-petal monkey-flower, toothpetal monkeyflower
  Mimulus diffusus A.L. Grant -- accepted -- Palomar monkeyflower
  Mimulus discolor A.L. Grant -- not accepted
  Mimulus douglasii (Benth.) A. Gray -- accepted -- brownies
  Mimulus dudleyi A.L. Grant -- accepted -- Dudley's monkeyflower
  Mimulus eastwoodiae Rydb. -- accepted -- Eastwood's monkey-flower, crimson monkeyflower, Eastwood's monkeyflower
  Mimulus eisenii Kellogg -- not accepted
  Mimulus equinus Greene -- not accepted
  Mimulus evanescens Meinke -- accepted -- disappearing monkeyflower
  Mimulus exiguus A. Gray -- accepted -- San Bernardino Mountain monkey-flower
  Mimulus filicaulis S. Watson -- accepted -- slenderstem monkeyflower, Hetch Hetchy monkey-flower
  Mimulus flemingii Munz -- not accepted
  Mimulus floribundus Lindl. -- accepted -- floriferous monkeyflower, purplestem monkeyflower, manyflowered monkeyflower
  Mimulus floribundus ssp. moorei Iltis -- not accepted
  Mimulus floribundus var. floribundus Lindl. -- not accepted
  Mimulus floribundus var. geniculatus (Greene) A.L. Grant -- not accepted
  Mimulus floribundus var. membranaceus (A. Nelson) A.L. Grant -- not accepted
  Mimulus floribundus var. subulatus A.L. Grant -- not accepted
  Mimulus fremontii (Benth.) A. Gray -- accepted -- Fremont's monkeyflower
  Mimulus fremontii var. viscidus (Congdon) Jeps. -- not accepted
  Mimulus gemmiparus W.A. Weber -- accepted -- Rocky Mountain monkeyflower, Weber monkey-flower
  Mimulus geniculatus Greene -- not accepted
  Mimulus geyeri Torr. -- not accepted
  Mimulus glabratus Kunth -- accepted -- roundleaf monkey-flower, mimule glabre, round-leaf monkey-flower, smooth monkeyflower, roundleaf monkeyflower
  Mimulus glabratus ssp. fremontii (Benth.) Pennell -- not accepted
  Mimulus glabratus ssp. michiganensis Pennell -- not accepted -- Michigan monkey flower
  Mimulus glabratus ssp. typicus Pennell -- not accepted
  Mimulus glabratus ssp. utahensis Pennell -- not accepted
  Mimulus glabratus var. ascendens A. Gray -- not accepted
  Mimulus glabratus var. fremontii (Benth.) A.L. Grant -- not accepted
  Mimulus glabratus var. glabratus Kunth -- accepted -- round-leaf monkey-flower, roundleaf monkeyflower
  Mimulus glabratus var. jamesii (Torr. & A. Gray ex Benth.) A. Gray -- accepted -- James' monkeyflower
  Mimulus glabratus var. michiganensis (Pennell) Fassett -- not accepted -- Michigan monkey-flower, Michigan monkeyflower
  Mimulus glabratus var. oklahomensis Fassett -- accepted -- Oklahoma monkeyflower
  Mimulus glareosus Greene -- not accepted
  Mimulus glaucescens Greene -- accepted -- shieldbract monkeyflower
  Mimulus glutinosus J.C. Wendl. -- not accepted
  Mimulus glutinosus var. brachypus A. Gray -- not accepted
  Mimulus glutinosus var. linearis (Benth.) A. Gray -- not accepted
  Mimulus glutinosus var. puniceus (Nutt.) A. Gray -- not accepted
  Mimulus gracilipes B.L. Rob. -- accepted -- slenderstalk monkeyflower
  Mimulus grandiflorus Howell -- not accepted
  Mimulus grandis (Greene) A. Heller -- not accepted
  Mimulus grantianus Eastw. -- not accepted
  Mimulus gratioloides Rydb. -- not accepted
  Mimulus grayi A.L. Grant -- accepted -- Mariposa monkeyflower
  Mimulus guttatus DC. -- accepted -- common monkeyflower, seep monkeyflower
  Mimulus guttatus ssp. arenicola Pennell -- not accepted
  Mimulus guttatus ssp. arvensis (Greene) Munz -- not accepted
  Mimulus guttatus ssp. haidensis Calder & Roy L. Taylor -- not accepted
  Mimulus guttatus ssp. litoralis Pennell -- not accepted
  Mimulus guttatus ssp. micranthus (A. Heller) Munz -- not accepted
  Mimulus guttatus ssp. scouleri (Hook.) Pennell -- not accepted
  Mimulus guttatus var. arvensis (Greene) A.L. Grant -- not accepted
  Mimulus guttatus var. decorus A.L. Grant -- not accepted
  Mimulus guttatus var. depauperatus (A. Gray) A.L. Grant -- not accepted
  Mimulus guttatus var. glaucescens (Greene) Jeps. -- not accepted
  Mimulus guttatus var. gracilis (A. Gray) G.R. Campb. -- not accepted
  Mimulus guttatus var. grandis Greene -- not accepted
  Mimulus guttatus var. guttatus DC. -- not accepted
  Mimulus guttatus var. hallii (Greene) A.L. Grant -- not accepted
  Mimulus guttatus var. insignis Greene -- not accepted
  Mimulus guttatus var. laxus (Pennell) M. Peck -- not accepted
  Mimulus guttatus var. lyratus (Benth.) Pennell -- not accepted
  Mimulus guttatus var. microphyllus (Benth.) Pennell -- not accepted
  Mimulus guttatus var. nasutus (Greene) Jeps. -- not accepted
  Mimulus guttatus var. puberulus (Greene) A.L. Grant -- not accepted
  Mimulus hallii Greene -- not accepted
  Mimulus hirsutus Howell -- not accepted
  Mimulus hymenophyllus Meinke -- accepted -- thinsepal monkeyflower
  Mimulus implexus Greene -- not accepted
  Mimulus implicatus Greene -- not accepted
  Mimulus inamoenus Greene -- not accepted
  Mimulus inconspicuus A. Gray -- accepted -- smallflower monkeyflower
  Mimulus inconspicuus var. acutidens (Greene) A. Gray -- not accepted
  Mimulus inconspicuus var. latidens A. Gray -- not accepted
  Mimulus inflatulus Suksd. -- not accepted
  Mimulus inodorus Greene -- not accepted
  Mimulus jamesii Torr. & A. Gray ex Benth. -- not accepted
  Mimulus jamesii var. fremontii Benth. -- not accepted
  Mimulus jamesii var. texensis A. Gray -- not accepted
  Mimulus jepsonii A.L. Grant -- accepted -- Jepson's monkeyflower
  Mimulus johnstonii A.L. Grant -- accepted -- Johnston's monkeyflower
  Mimulus jungermannioides Suksd. -- accepted -- liverwort monkeyflower
  Mimulus kelloggii (Curran ex Greene) Curran ex A. Gray -- accepted -- Kellogg's monkeyflower
  Mimulus laciniatus A. Gray -- accepted -- cutleaf monkeyflower
  Mimulus langsdorffii Donn ex Greene -- not accepted
  Mimulus langsdorffii var. argutus Greene -- not accepted
  Mimulus langsdorffii var. arvensis (Greene) Jeps. -- not accepted
  Mimulus langsdorffii var. californicus Jeps. -- not accepted
  Mimulus langsdorffii var. grandis (Greene) Greene -- not accepted
  Mimulus langsdorffii var. guttatus (DC.) Jeps. -- not accepted
  Mimulus langsdorffii var. insignis (Greene) Greene -- not accepted
  Mimulus langsdorffii var. microphyllus (Benth.) A. Nelson & J.F. Macbr. -- not accepted
  Mimulus langsdorffii var. minimus J.K. Henry -- not accepted
  Mimulus langsdorffii var. minor (A. Nelson) Cockerell -- not accepted
  Mimulus langsdorffii var. nasutus (Greene) Jeps. -- not accepted
  Mimulus langsdorffii var. platyphyllus Greene -- not accepted
  Mimulus langsdorffii var. tilingii (Regel) Greene -- not accepted
  Mimulus langsdorfi Donn ex Greene -- not accepted
  Mimulus langsdorfii Donn ex Greene -- not accepted
  Mimulus langsdorfii var. argutus Greene -- not accepted
  Mimulus langsdorfii var. arvensis (Greene) Jeps. -- not accepted
  Mimulus langsdorfii var. californicus Jeps. -- not accepted
  Mimulus langsdorfii var. grandis (Greene) Greene -- not accepted
  Mimulus langsdorfii var. guttatus (DC.) Jeps. -- not accepted
  Mimulus langsdorfii var. insignis (Greene) Greene -- not accepted
  Mimulus langsdorfii var. microphyllus (Benth.) A. Nelson & J.F. Macbr. -- not accepted
  Mimulus langsdorfii var. minimus J.K. Henry -- not accepted
  Mimulus langsdorfii var. minor (A. Nelson) Cockerell -- not accepted
  Mimulus langsdorfii var. nasutus (Greene) Jeps. -- not accepted
  Mimulus langsdorfii var. platyphyllus Greene -- not accepted
  Mimulus langsdorfii var. tilingii (Regel) Greene -- not accepted
  Mimulus latidens (A. Gray) Greene -- accepted -- broadtooth monkeyflower
  Mimulus latifolius A. Gray -- accepted -- broadleaf monkeyflower
  Mimulus laxus Pennell -- not accepted
  Mimulus layneae (Greene) Jeps. -- accepted -- Layne's monkeyflower
  Mimulus leibergii A.L. Grant -- not accepted
  Mimulus leptaleus A. Gray -- accepted -- least monkeyflower, slender monkeyflower
  Mimulus leptanthus (Nutt.) A.L. Grant -- not accepted
  Mimulus lewisii Pursh -- accepted -- Lewis' monkeyflower, purple monkeyflower
  Mimulus linearifolius (A.L. Grant) Pennell -- not accepted
  Mimulus linearis Benth. -- not accepted
  Mimulus linearis auct. non Benth. -- not accepted
  Mimulus longiflorus (Nutt.) A.L. Grant -- not accepted
  Mimulus longiflorus ssp. calycinus (Eastw.) Munz -- not accepted
  Mimulus longiflorus var. calycinus (Eastw.) A.L. Grant -- not accepted
  Mimulus longiflorus var. linearis (Benth.) A.L. Grant -- not accepted
  Mimulus longiflorus var. longiflorus (Nutt.) A.L. Grant -- not accepted
  Mimulus longiflorus var. rutilus A.L. Grant -- not accepted
  Mimulus longulus Greene -- not accepted
  Mimulus lucens Greene -- not accepted
  Mimulus luteus L. -- accepted -- blood-drop emlets, yellow monkey-flower, monkey musk
  Mimulus luteus var. alpinus A. Gray -- not accepted
  Mimulus luteus var. cupreus (hort. ex Dombrain) Hook. -- not accepted
  Mimulus luteus var. depauperatus A. Gray -- not accepted
  Mimulus luteus var. gracilis A. Gray -- not accepted
  Mimulus lyratus Benth. -- not accepted
  Mimulus macranthus Pennell -- not accepted
  Mimulus maguirei Pennell -- not accepted
  Mimulus marmoratus Greene -- not accepted
  Mimulus membranaceus A. Nelson -- not accepted
  Mimulus mephiticus Greene -- accepted -- foul-odor monkeyflower, foul odor monkeyflower
  Mimulus micranthus A. Heller -- not accepted
  Mimulus microcarpus Pennell -- not accepted
  Mimulus microphyllus Benth. -- not accepted
  Mimulus microphyton Pennell -- not accepted
  Mimulus minor A. Nelson -- not accepted
  Mimulus minthodes Greene -- not accepted
  Mimulus minusculus Greene -- not accepted
  Mimulus minutissimus Eastw. -- not accepted
  Mimulus modestus Eastw. -- not accepted
  Mimulus mohavensis Lemmon -- accepted -- Mojave monkey-flower
  Mimulus moniliformis Greene -- not accepted
  Mimulus montioides A. Gray -- accepted -- mountain monkeyflower, mointain monkeyflower
  Mimulus moschatus Douglas ex Lindl. -- accepted -- musk monkeyflower, muskflower
  Mimulus moschatus var. longiflorus A. Gray -- accepted -- muskflower
  Mimulus moschatus var. moniliformis (Greene) Munz -- accepted -- muskflower
  Mimulus moschatus var. moschatus Douglas ex Lindl. -- accepted -- muskflower
  Mimulus moschatus var. pallidiflorus Suksd. -- not accepted
  Mimulus moschatus var. sessilifolius A. Gray -- accepted -- muskflower
  Mimulus multiflorus Pennell -- not accepted
  Mimulus nanus Hook. & Arn. -- accepted -- dwarf purple monkeyflower
  Mimulus nanus ssp. cascadensis Ezell ined. -- not accepted -- dwarf purple monkeyflower
  Mimulus nanus ssp. nanus Hook. & Arn. -- accepted -- dwarf purple monkeyflower
  Mimulus nanus var. bicolor (A. Gray) A. Gray -- not accepted
  Mimulus nanus var. subuniflorus Hook. & Arn. -- not accepted
  Mimulus nasutus Greene -- not accepted
  Mimulus nasutus var. micranthus (A. Heller) A.L. Grant -- not accepted
  Mimulus nevadensis Gand. -- not accepted
  Mimulus norrisii Heckard & Shevock -- accepted -- Kaweah monkeyflower
  Mimulus nudatus Curran ex Greene -- accepted -- bare monkeyflower
  Mimulus ovatus (A. Gray) N.H. Holmgren -- accepted -- Carson monkeyflower, eggleaf monkeyflower
  Mimulus pallidus Salisb. -- not accepted
  Mimulus palmeri A. Gray -- accepted -- Palmer's monkeyflower
  Mimulus palmeri var. androsaceus (Curran ex Greene) A. Gray -- not accepted
  Mimulus paniculatus Greene -- not accepted
  Mimulus pardalis Pennell -- not accepted
  Mimulus parishii Gand. -- not accepted -- Parish's monkeyflower
  Mimulus parishii Greene -- accepted -- Parish's monkeyflower
  Mimulus parryi A. Gray -- accepted -- annual redspot monkey-flower, redspot monkeyflower, annual redspot monkeyflower
  Mimulus parviflorus (Greene) A.L. Grant -- not accepted
  Mimulus parvulus Wooton & Standl. -- not accepted
  Mimulus patulus Pennell -- not accepted -- stalk-leaved monkey-flower
  Mimulus peduncularis Douglas ex Benth. -- not accepted
  Mimulus peduncularis sensu A. Gray -- not accepted
  Mimulus petiolaris Greene -- not accepted
  Mimulus pictus (Curran ex Greene) A. Gray -- accepted -- calico monkeyflower
  Mimulus pilosellus Greene -- not accepted
  Mimulus pilosus (Benth.) S. Watson -- accepted -- false monkeyflower
  Mimulus platycalyx Pennell -- accepted -- widecalyx monkeyflower
  Mimulus platylaemus Pennell -- accepted -- widethroat pink monkeyflower
  Mimulus prattenii Durand -- not accepted
  Mimulus primuloides Benth. -- accepted -- yellow creeping monkey-flower, primrose monkeyflower
  Mimulus primuloides ssp. linearifolius (A.L. Grant) Munz -- not accepted
  Mimulus primuloides ssp. primuloides Benth. -- not accepted -- monkeyflower
  Mimulus primuloides var. linearifolius A.L. Grant -- accepted -- primrose monkeyflower
  Mimulus primuloides var. minimus M. Peck -- not accepted
  Mimulus primuloides var. pilosellus (Greene) Smiley -- not accepted
  Mimulus primuloides var. primuloides Benth. -- accepted -- primrose monkey-flower, primrose monkeyflower
  Mimulus prionophyllus Greene -- not accepted
  Mimulus procerus Greene -- not accepted
  Mimulus puberulus Greene -- not accepted
  Mimulus pubescens Benth. -- not accepted
  Mimulus pulchellus (Drew ex Greene) A.L. Grant -- accepted -- yellowlip pansy monkeyflower
  Mimulus pulsiferae A. Gray -- accepted -- candelabrum monkeyflower
  Mimulus puncticalyx Gand. -- not accepted
  Mimulus puniceus (Nutt.) Steud. -- not accepted
  Mimulus purpureus A.L. Grant -- accepted -- little purple monkeyflower
  Mimulus purpureus var. pauxillus A.L. Grant -- accepted -- little purple monkeyflower
  Mimulus purpureus var. purpureus A.L. Grant -- accepted -- little purple monkeyflower, purple monkey-flower
  Mimulus pygmaeus A.L. Grant -- accepted -- Egg Lake monkey-flower
  Mimulus rattanii A. Gray -- accepted -- Rattan's monkeyflower
  Mimulus rattanii ssp. decurtatus (A.L. Grant) Pennell -- not accepted
  Mimulus rattanii var. decurtatus (A.L. Grant) Pennell -- accepted -- Rattan's monkeyflower
  Mimulus rattanii var. rattanii A. Gray -- accepted -- Rattan's monkeyflower
  Mimulus reifschneiderae Edwin -- not accepted
  Mimulus reniformis Engelm. ex Benth. -- not accepted
  Mimulus ringens L. -- accepted -- Allegheny monkey-flower, Allegheny monkeyflower
  Mimulus ringens var. colpophilus Fernald -- accepted -- Allegheny monkeyflower, square-stemmed monkey-flower
  Mimulus ringens var. congesta Farw. -- not accepted
  Mimulus ringens var. minthodes (Greene) A.L. Grant -- not accepted
  Mimulus ringens var. ringens L. -- accepted -- Allegheny monkeyflower, Allegheny monkey-flower
  Mimulus rivularis Nutt. -- not accepted
  Mimulus rubellus A. Gray -- accepted -- redstem monkey-flower, red monkeyflower, little redstem monkeyflower
  Mimulus rubellus var. breweri (Greene) Jeps. -- not accepted
  Mimulus rubellus var. latiflorus S. Watson -- not accepted
  Mimulus rupicola Coville & A.L. Grant -- accepted -- Death Valley monkeyflower
  Mimulus scouleri Hook. -- not accepted
  Mimulus scouleri var. caespitosus Greene -- not accepted
  Mimulus serotinus Suksd. -- not accepted
  Mimulus shevockii Heckard & Bacig. -- accepted -- Kelso Creek monkey-flower
  Mimulus spissus A.L. Grant -- accepted -- compact monkey-flower, compact monkeyflower
  Mimulus spissus var. lincolnensis Edwin -- not accepted
  Mimulus stamineus A.L. Grant -- not accepted
  Mimulus subreniformis Greene -- not accepted
  Mimulus subsecundus A. Gray -- accepted -- onesided monkeyflower
  Mimulus subsecundus var. constrictus A.L. Grant -- not accepted
  Mimulus subsecundus var. viscidus (Congdon) A.L. Grant -- not accepted
  Mimulus subulatus (A.L. Grant) Pennell -- not accepted
  Mimulus subuniflorus (Hook. & Arn.) Jeps. -- not accepted
  Mimulus suksdorfii A. Gray -- accepted -- miniature monkey-flower, Suksdorf's monkeyflower
  Mimulus tenellus Nutt. ex A. Gray -- not accepted
  Mimulus thermalis A. Nelson -- not accepted
  Mimulus tilingii Regel -- accepted -- subalpine monkey-flower, subalpine monkeyflower, Tiling's monkeyflower
  Mimulus tilingii var. caespitosus (Greene) A.L. Grant -- accepted -- subalpine monkeyflower
  Mimulus tilingii var. corallinus (Greene) A.L. Grant -- not accepted
  Mimulus tilingii var. tilingii Regel -- accepted -- Tiling's monkeyflower
  Mimulus tillingii Regel -- not accepted
  Mimulus tolmiei (Benth.) Rydb. -- not accepted
  Mimulus torreyi A. Gray -- accepted -- Torrey's monkeyflower
  Mimulus traskiae A.L. Grant -- accepted -- Santa Catalina monkey-flower
  Mimulus tricolor Hartw. ex Lindl. -- accepted -- tricolor monkeyflower
  Mimulus tricolor var. angustatus (A. Gray) A. Gray -- not accepted
  Mimulus trisulcatus Pennell -- not accepted
  Mimulus unimaculatus Pennell -- not accepted
  Mimulus verbenaceus Greene -- not accepted -- crimson monkey-flower, crimson monkeyflower
  Mimulus veronicifolius Greene -- not accepted
  Mimulus viscidus Congdon -- accepted -- sticky monkeyflower
  Mimulus viscidus ssp. constrictus (A.L. Grant) Munz -- accepted -- sticky monkeyflower
  Mimulus viscidus ssp. viscidus Congdon -- accepted -- sticky monkeyflower
  Mimulus viscosus Moench -- not accepted
  Mimulus washingtonensis Gand. -- accepted -- Washington monkeyflower
  Mimulus washoensis Edwin -- not accepted
  Mimulus whipplei A.L. Grant -- accepted -- Whipple's monkey-flower
  Mimulus whitneyi A. Gray -- accepted -- harlequin monkeyflower
  Mimulus wolfii Eastw. -- not accepted
  Mimulus X bartonianus Rivoire -- accepted -- monkeyflower
  Misopates Raf. -- accepted
  Misopates orontium (L.) Raf. -- accepted -- linearleaf snapdragon
  Mohavea A. Gray -- accepted
  Mohavea breviflora Coville -- accepted -- golden desert-snapdragon, golden desert snapdragon
  Mohavea confertiflora (Benth.) A. Heller -- accepted -- ghostflower, ghost flower
  Moldavica moldavica (L.) Britton -- not accepted
  Moldavica parviflora (Nutt.) Britton -- not accepted
  Moldavica thymiflora (L.) Rydb. -- not accepted
  Moluccella L. -- accepted
  Moluccella laevis L. -- accepted -- shellflower
  Monarda L. -- accepted -- beebalm
  Monarda allophylla Michx. -- not accepted
  Monarda aristata Nutt. -- not accepted
  Monarda austromontana Epling -- not accepted
  Monarda bradburiana L.C. Beck -- accepted -- wildbergamot beebalm, eastern beebalm
  Monarda citriodora Cerv. ex Lag. -- accepted -- lemon mint, lemon beebalm
  Monarda citriodora ssp. austromontana (Epling) Scora -- not accepted -- oregano, lemon beebalm
  Monarda citriodora ssp. citriodora Cerv. ex Lag. -- not accepted -- lemon beebalm
  Monarda citriodora ssp. citriodora var. attenuata Scora -- not accepted -- lemon beebalm
  Monarda citriodora ssp. citriodora var. citriodora Cerv. ex Lag. -- not accepted -- lemon beebalm
  Monarda citriodora ssp. citriodora var. parva Scora -- not accepted -- lemon beebalm
  Monarda citriodora var. attenuata Scora -- not accepted
  Monarda citriodora var. austromontana (Epling) B.L. Turner -- accepted -- lemon beebalm
  Monarda citriodora var. citriodora Cerv. ex Lag. -- accepted -- lemon beebalm
  Monarda citriodora var. parva Scora -- accepted -- lemon beebalm
  Monarda clinopodia L. -- accepted -- white bergamot
  Monarda clinopodioides A. Gray -- accepted -- basil beebalm
  Monarda didyma L. -- accepted -- Oswego tea, monarde écarlate, scarlet beebalm
  Monarda dispersa Small -- not accepted
  Monarda dressleri Scora -- accepted -- Dressler's beebalm
  Monarda fistulosa Sims -- not accepted -- wildbergamot beebalm
  Monarda fistulosa L. -- accepted -- wildbergamot horsemint, Oswego-tea, mintleaf beebalm, wildbergamot beebalm, wild bergamot
  Monarda fistulosa ssp. brevis (Fosberg & Artz) Scora -- not accepted -- wild bergamot
  Monarda fistulosa ssp. fistulosa L. -- not accepted -- Oswego-tea, wild bergamot beebalm, wild bergamot
  Monarda fistulosa ssp. fistulosa var. fistulosa L. -- not accepted -- wild bergamot, Oswego-tea, wildbergamot beebalm
  Monarda fistulosa ssp. fistulosa var. longepetiolata B. Boivin -- not accepted -- wildbergamot beebalm
  Monarda fistulosa ssp. fistulosa var. maheuxii B. Boivin -- not accepted -- mintleaf beebalm
  Monarda fistulosa ssp. fistulosa var. menthifolia (Graham) Fernald -- not accepted -- wild bergamot, Oswego-tea, mintleaf beebalm
  Monarda fistulosa ssp. fistulosa var. mollis (L.) Benth. -- not accepted -- wild bergamot, Oswego-tea
  Monarda fistulosa ssp. fistulosa var. rubra A. Gray -- not accepted -- wild bergamot
  Monarda fistulosa ssp. fistulosa var. stipitatoglandulosa (Waterf.) Scora -- not accepted -- wild bergamot
  Monarda fistulosa var. brevis Fosberg & Artz -- accepted
  Monarda fistulosa var. clinopodia (L.) Cooperr. -- not accepted
  Monarda fistulosa var. fistulosa L. -- accepted -- wild bergamot
  Monarda fistulosa var. longepetiolata B. Boivin -- accepted
  Monarda fistulosa var. mahuexii B. Boivin -- accepted
  Monarda fistulosa var. menthifolia (Graham) Fernald -- accepted -- mintleaf bergamot, wild bergamot
  Monarda fistulosa var. mollis (L.) Benth. -- accepted -- wild bergamot
  Monarda fistulosa var. rubra A. Gray -- accepted -- wild bergamot
  Monarda fistulosa var. stipitatoglandulosa (Waterf.) Scora -- not accepted -- wild bergamot
  Monarda fruticulosa Epling -- accepted -- spotted beebalm
  Monarda humilis (Torr.) Prather & J.A. Keith -- accepted
  Monarda lasiodonta (A. Gray) Small -- not accepted
  Monarda lindheimeri Engelm. & A. Gray ex A. Gray -- accepted -- Lindheimer's beebalm
  Monarda maritima (Cory) Correll -- accepted
  Monarda media Willd. -- accepted -- purple bergamot
  Monarda menthifolia Graham -- not accepted
  Monarda mollis L. -- not accepted
  Monarda pectinata Nutt. -- accepted -- horse mint, plains beebalm, spotted beebalm, miners lettuce, pony beebalm
  Monarda punctata L. -- accepted -- spotted beebalm
  Monarda punctata ssp. arkansana E.M. McClint. & Epling -- not accepted
  Monarda punctata ssp. coryi E.M. McClint. & Epling -- not accepted
  Monarda punctata ssp. fruticulosa (Epling) Scora -- not accepted -- spotted beebalm
  Monarda punctata ssp. immaculata Pennell -- not accepted -- spotted beebalm
  Monarda punctata ssp. intermedia E.M. McClint. & Epling -- not accepted
  Monarda punctata ssp. maritima (Cory) Scora -- not accepted -- seaside beebalm
  Monarda punctata ssp. occidentalis Epling -- not accepted
  Monarda punctata ssp. punctata L. -- not accepted -- spotted beebalm
  Monarda punctata ssp. punctata var. arkansana (E.M. McClint. & Epling) Shinners -- not accepted -- spotted beebalm
  Monarda punctata ssp. punctata var. correllii B.L. Turner -- not accepted
  Monarda punctata ssp. punctata var. coryi (E.M. McClint. & Epling) Shinners -- not accepted -- spotted beebalm, Cory's beebalm
  Monarda punctata ssp. punctata var. intermedia (E.M. McClint. & Epling) Waterf. -- not accepted -- spotted beebalm, intermediate beebalm
  Monarda punctata ssp. punctata var. lasiodonta A. Gray -- not accepted -- spotted beebalm
  Monarda punctata ssp. punctata var. occidentalis (Epling) E.J. Palmer & Steyerm. -- not accepted -- spotted beebalm, western beebalm
  Monarda punctata ssp. punctata var. punctata L. -- not accepted -- spotted beebalm
  Monarda punctata ssp. punctata var. stanfieldii (Small) Cory -- not accepted -- Stanfield's beebalm
  Monarda punctata ssp. punctata var. villicaulis (Pennell) E.J. Palmer & Steyerm. -- not accepted -- spotted beebalm
  Monarda punctata ssp. punctata var. viridissima (Correll) Scora -- not accepted -- spotted beebalm
  Monarda punctata ssp. villicaulis Pennell -- not accepted
  Monarda punctata var. arkansana (E.M. McClint. & Epling) Shinners -- accepted -- spotted beebalm
  Monarda punctata var. correllii B.L. Turner -- accepted -- spotted beebalm
  Monarda punctata var. coryi (E.M. McClint. & Epling) Shinners -- accepted -- spotted beebalm
  Monarda punctata var. fruticulosa (Epling) Scora -- not accepted
  Monarda punctata var. immaculata (Pennell) Scora -- accepted
  Monarda punctata var. intermedia (E.M. McClint. & Epling) Waterf. -- accepted -- spotted beebalm
  Monarda punctata var. lasiodonta A. Gray -- accepted -- spotted beebalm
  Monarda punctata var. leucantha Nash -- not accepted
  Monarda punctata var. maritima Cory -- not accepted
  Monarda punctata var. occidentalis (Epling) E.J. Palmer & Steyerm. -- accepted -- spotted beebalm
  Monarda punctata var. punctata L. -- accepted -- spotted beebalm
  Monarda punctata var. stanfieldii (Small) Cory -- not accepted
  Monarda punctata var. villicaulis (Pennell) E.J. Palmer & Steyerm. -- accepted -- spotted beebalm
  Monarda rigida Raf. -- not accepted
  Monarda russeliana Nutt. ex Sims -- accepted -- Russell's henbit, redpurple beebalm
  Monarda scabra L.C. Beck -- not accepted
  Monarda stanfieldii Small -- accepted -- Stanfield's beebalm
  Monarda stipitatoglandulosa Waterf. -- accepted -- wild bergamot
  Monarda tenuiaristata (A. Gray) Small -- not accepted
  Monarda villosa M. Martens -- not accepted
  Monarda virgata Raf. -- not accepted
  Monarda viridissima Correll -- accepted -- green beebalm
  Monarda X medioides Duncan -- accepted -- beebalm
  Monardella Benth. -- accepted
  Monardella antonina Hardham -- accepted -- San Antonio Hills monardella
  Monardella antonina ssp. antonina Hardham -- accepted -- San Antonio Hills monardella
  Monardella antonina ssp. benitensis (Hardham) Jokerst -- accepted -- San Benito monardella
  Monardella arizonica Epling -- accepted -- Arizona mint, Arizona monardella
  Monardella australis Abrams -- accepted -- southern monardella
  Monardella beneolens Shevock, Ertter & Jokerst -- accepted -- sweet-smelling monardella
  Monardella benitensis Hardham -- not accepted
  Monardella breweri A. Gray -- accepted -- Brewer's monardella
  Monardella candicans Benth. -- accepted -- Sierra monardella
  Monardella cinerea Abrams -- accepted -- gray monardella
  Monardella crispa Elmer -- accepted -- crisped monardella, crisp monardella
  Monardella discolor Greene -- not accepted
  Monardella douglasii Benth. -- accepted -- Douglas' monardella
  Monardella douglasii ssp. douglasii Benth. -- accepted -- Douglas' monardella
  Monardella douglasii ssp. venosa (Torr.) Jokerst -- accepted -- veiny monardella
  Monardella douglasii var. douglasii Benth. -- not accepted -- Douglas' mountainbalm
  Monardella douglasii var. venosa (Torr.) Jeps. -- not accepted -- veiny monardella
  Monardella exilis (A. Gray) Greene -- accepted -- desert monardella
  Monardella follettii (Jeps.) Jokerst -- accepted -- Follett's monardella
  Monardella frutescens (Hoover) Jokerst -- accepted -- San Luis Obispo monardella
  Monardella glauca Greene -- accepted -- blue monardella, gray monardella, pale monardella
  Monardella hypoleuca A. Gray -- accepted -- thickleaf monardella
  Monardella hypoleuca ssp. hypoleuca A. Gray -- accepted -- thickleaf monardella
  Monardella hypoleuca ssp. lanata (Abrams) Munz -- accepted -- felt leaf rock-mint, feltleaf monardella
  Monardella lanata Abrams -- not accepted
  Monardella lanceolata A. Gray -- accepted -- mustang mountainbalm, mustang mint, mustang monardella
  Monardella lanceolata var. glandulifera I.M. Johnst. -- accepted -- mustang monardella
  Monardella lanceolata var. lanceolata A. Gray -- accepted -- mustang monardella, mustang mint
  Monardella lanceolata var. microcephala A. Gray -- accepted -- mustang monardella
  Monardella leucocephala A. Gray -- accepted -- Merced monardella
  Monardella linoides A. Gray -- accepted -- flax-leaf mountainbalm, narrowleaf monardella, flaxleaf monardella
  Monardella linoides ssp. linoides A. Gray -- accepted -- flax-leaf mountainbalm, flaxleaf mountainbalm, flaxleaf monardella
  Monardella linoides ssp. oblonga (Greene) Abrams -- accepted -- flaxleaf monardella, flax-like monardella
  Monardella linoides ssp. stricta (Parish) Epling -- accepted -- flaxleaf mountainbalm, flaxleaf monardella
  Monardella linoides ssp. viminea (Greene) Abrams -- accepted -- willowy monardella
  Monardella macrantha A. Gray -- accepted -- red monardella
  Monardella macrantha ssp. hallii (Abrams) Abrams -- accepted -- Hall's monardella
  Monardella macrantha ssp. macrantha A. Gray -- accepted -- red monardella
  Monardella macrantha ssp. nana (A. Gray) Epling -- not accepted
  Monardella macrantha var. arida H.M. Hall -- not accepted
  Monardella macrantha var. hallii Abrams -- not accepted
  Monardella macrantha var. tenuiflora S. Watson ex A. Gray -- not accepted
  Monardella nana A. Gray -- accepted -- yellow monardella
  Monardella nana ssp. arida (H.M. Hall) Abrams -- accepted -- yellow monardella
  Monardella nana ssp. leptosiphon (Torr.) Abrams -- accepted -- San Felipe monardella
  Monardella nana ssp. nana A. Gray -- accepted -- yellow monardella
  Monardella nana ssp. tenuiflora (S. Watson ex A. Gray) Abrams -- accepted -- yellow monardella
  Monardella neglecta Greene -- not accepted
  Monardella odoratissima Benth. -- accepted -- Pacific monardella, mountain monardella
  Monardella odoratissima ssp. australis (Abrams) Epling -- not accepted
  Monardella odoratissima ssp. discolor (Greene) Epling -- accepted -- mountain monardella
  Monardella odoratissima ssp. euodoratissima Epling -- not accepted
  Monardella odoratissima ssp. glauca (Greene) Epling -- not accepted
  Monardella odoratissima ssp. odoratissima Benth. -- accepted -- alpine mountainbalm, mountain monardella
  Monardella odoratissima ssp. pallida (A. Heller) Epling -- accepted -- alpine mountainbalm, mountain monardella
  Monardella odoratissima ssp. parvifolia (Greene) Epling -- not accepted
  Monardella odoratissima ssp. pinetorum (A. Heller) Epling -- not accepted
  Monardella odoratissima var. discolor (Greene) H. St. John -- not accepted
  Monardella odoratissima var. follettii Jeps. -- not accepted
  Monardella odoratissima var. glauca (Greene) H. St. John -- not accepted
  Monardella odoratissima var. neglecta Cronquist -- not accepted
  Monardella odoratissima var. ovata (Greene) Jeps. -- not accepted
  Monardella odoratissima var. parvifolia (Greene) Jeps. -- not accepted
  Monardella palmeri A. Gray -- accepted -- Palmer's monardella
  Monardella pringlei A. Gray -- accepted -- Pringle's monardella, Pringle monardella
  Monardella purpurea Howell -- accepted -- serpentine monardella
  Monardella robisonii Epling ex Munz -- accepted -- Robison's monardella
  Monardella saxicola I.M. Johnst. -- not accepted
  Monardella sheltonii (Torr.) Howell -- accepted -- Shelton's monardella
  Monardella siskiyouensis Hardham -- accepted -- Siskiyou monardella
  Monardella stebbinsii Hardham & Bartel -- accepted -- Feather River monardella
  Monardella stoneana Elvin & Sanders -- accepted
  Monardella subglabra (Hoover) Hardham -- not accepted
  Monardella undulata Benth. -- accepted -- curlyleaf monardella
  Monardella undulata var. frutescens Hoover -- not accepted
  Monardella undulata var. undulata Benth. -- not accepted -- curlyleaf mountainbalm
  Monardella villosa Benth. -- accepted -- coyote mint
  Monardella villosa ssp. franciscana (Elmer) Jokerst -- accepted -- coyote mint
  Monardella villosa ssp. globosa (Greene) Jokerst -- accepted -- robust coyote mint
  Monardella villosa ssp. neglecta (Greene) Epling -- not accepted
  Monardella villosa ssp. obispoensis (Hoover) Jokerst -- accepted -- San Luis Obispo coyote mint
  Monardella villosa ssp. sheltonii (Torr.) Epling -- not accepted
  Monardella villosa ssp. subserrata (Greene) Epling -- not accepted
  Monardella villosa ssp. villosa Benth. -- accepted -- coyote mint
  Monardella villosa ssp. villosa var. franciscana (Elmer) Epling -- not accepted -- coyote mountainbalm
  Monardella villosa ssp. villosa var. obispoensis Hoover -- not accepted -- coyote mountainbalm
  Monardella villosa ssp. villosa var. villosa Benth. -- not accepted -- coyote mountainbalm
  Monardella villosa var. franciscana (Elmer) Epling -- not accepted
  Monardella villosa var. obispoensis Hoover -- not accepted
  Monardella villosa var. subglabra Hoover -- not accepted
  Monardella viridis Jeps. -- accepted -- green monardella
  Monardella viridis ssp. saxicola (I.M. Johnst.) Ewan -- accepted -- rock monardella
  Monardella viridis ssp. viridis Jeps. -- accepted -- green monardella
  Monechma pilosella Nees -- not accepted
  Mosla (Benth.) Buch.-Ham. ex Maxim. -- accepted -- mosla
  Mosla dianthera (Buch.-Ham. ex Roxb.) Maxim. -- accepted -- miniature beefsteak, miniature beefsteakplant
  Myoporum Sol. ex G. Forst. -- accepted
  Myoporum boninense Koidz. -- accepted
  Myoporum laetum G. Forst. -- accepted -- ngaio tree
  Myoporum parvifolium R. Br. -- accepted -- slender myoporum
  Myoporum sandwicense A. Gray -- accepted -- naio
  Myoporum sandwicense ssp. st.-johnii Webster -- not accepted
  Myoporum sandwicense var. degeneri Webster -- not accepted
  Myoporum sandwicense var. fauriei (Levl.) Kraenzlin -- not accepted
  Myoporum sandwicense var. lanaiense Webster -- not accepted
  Myoporum sandwicense var. sandwicense A. Gray -- not accepted
  Myoporum sandwicense var. stellatum Webster -- not accepted
  Myzorrhiza californica (Cham. & Schltdl.) Rydb. -- not accepted
  Myzorrhiza cooperi (A. Gray) Rydb. -- not accepted
  Myzorrhiza corymbosa Rydb. -- not accepted
  Myzorrhiza ludoviciana (Nutt.) Rydb. -- not accepted
  Myzorrhiza multiflora (Nutt.) Rydb. -- not accepted
  Myzorrhiza pinorum (Geyer ex Hook.) Rydb. -- not accepted
  Myzorrhiza tuberosa (A. Gray) Rydb. -- not accepted
  Nashia Millsp. -- accepted
  Nashia inaguensis Millsp. -- accepted -- el tuque
  Nelsonia R. Br. -- accepted
  Nelsonia brunelloides (Lam.) Kuntze -- not accepted
  Nelsonia canescens (Lam.) Spreng. -- accepted -- blue pussyleaf
  Nemesia Vent. -- accepted
  Nemesia strumosa Benth. -- accepted -- capejewels
  Neogaerrhinum Rothm. -- accepted
  Neogaerrhinum filipes (A. Gray) Rothm. -- accepted -- yellow twining snapdragon, yellow twining-snapdragon, Filipes' snapdragon
  Neogaerrhinum kelloggii (Greene) Thieret -- not accepted
  Neogaerrhinum strictum (Hook. & Arn.) Rothm. -- accepted -- Kellogg's snapdragon
  Nepeta L. -- accepted -- catnip
  Nepeta camphorata Boiss. & Heldr. -- accepted
  Nepeta cataria L. -- accepted -- catmint, catwort, field balm, catnip
  Nepeta grandiflora M. Bieb. -- accepted -- Caucasus catmint
  Nepeta hederacea (L.) Trevis. -- not accepted
  Nepeta mussinii Spreng. ex Henckel -- not accepted -- Persian catmint
  Nepeta racemosa Lam. -- accepted -- raceme catnip
  Nestegis Raf. -- accepted
  Nestegis sandwicensis (A. Gray) O. Deg. & I. Deg. & L.A.S. Johnson -- accepted -- Hawai'i olive
  Nicoteba betonica (L.) Lindau -- not accepted
  Nomaphila Blume -- accepted
  Nomaphila stricta (Vahl) Nees -- accepted -- stiff beargrass
  Noronhia (Stadman) Thouars -- accepted
  Noronhia emarginata (Lam.) Thouars -- accepted -- Madagascar olive
  Nothochelone (A. Gray) Straw -- accepted
  Nothochelone nemorosa (Douglas ex Lindl.) Straw -- accepted -- woodland beardtongue
  Nuttallanthus D.A. Sutton -- accepted -- toadflax
  Nuttallanthus canadensis (L.) D.A. Sutton -- accepted -- Canada toadflax, oldfield-toadflax, oldfield toadflax
  Nuttallanthus floridanus (Chapm.) D.A. Sutton -- accepted -- Apalachicola toadflax
  Nuttallanthus texanus (Scheele) D.A. Sutton -- accepted -- Texas toadflax
  Ocimum L. -- accepted -- basil
  Ocimum americanum L. -- accepted -- American basil, hoary basil
  Ocimum americanum -- not accepted
  Ocimum basilicum L. -- accepted -- sweet basil
  Ocimum campechianum Mill. -- accepted -- least basil
  Ocimum canum Sims -- not accepted -- hoary basil
  Ocimum gratissimum L. -- accepted -- African basil
  Ocimum kilimandscharicum Baker ex Gürke -- accepted -- hoary basil
  Ocimum micranthum Willd. -- not accepted
  Ocimum sanctum L. -- not accepted
  Ocimum tenuiflorum L. -- accepted -- holy basil
  Ocimum viride Willd. -- not accepted
  Odontites Ludwig -- accepted
  Odontites serotina (Lam.) Dumort. -- not accepted
  Odontites serotinus (Lam.) Dumort. -- not accepted
  Odontites vernus (Bellardi) Dumort. -- accepted -- red bartsia
  Odontites vernus ssp. serotinus (Lam.) Corb. -- not accepted -- red bartsia
  Odontites vernus ssp. vernus (Bellardi) Dumort. -- not accepted
  Odontites vulgaris Moench -- accepted
  Odontonema Nees -- accepted -- toothedthread
  Odontonema cuspidatum (Nees) Kuntze -- accepted -- mottled toothedthread
  Odontonema nitidum (Jacq.) Kuntze -- accepted -- shrubby toothedthread
  Odontonema strictum (Nees) Kuntze -- not accepted
  Odontonema tubiforme (Bertol.) Kuntze -- not accepted -- firespike
  Olea L. -- accepted -- olive
  Olea africana Mill. -- not accepted
  Olea chrysophylla Lam. -- not accepted
  Olea europaea L. -- accepted -- olive
  Olea europaea ssp. africana (Mill.) P. Green -- not accepted -- African olive
  Olea europaea ssp. cuspidata (Wall. ex G. Don) Cif. -- accepted -- African olive
  Olea europaea ssp. europaea L. -- accepted -- European olive
  Olea ferruginea Royle -- not accepted
  Olea verrucosa (Willd.) Link -- not accepted
  Oleaceae -- accepted -- olives
  Oplonia Raf. -- accepted
  Oplonia microphylla (Lam.) Stearn -- accepted -- thicketwort
  Oplonia spinosa (Jacq.) Raf. -- accepted -- pricklybush
  Origanum L. -- accepted
  Origanum heracleoticum L. -- not accepted
  Origanum majorana L. -- accepted -- sweet marjoram
  Origanum maru L. -- not accepted -- Egyptian marjoram
  Origanum onites L. -- accepted -- pot marjoram
  Origanum tyttanthum Gontsch. -- not accepted
  Origanum vulgare L. -- accepted -- oregano
  Origanum vulgare ssp. gracile (K. Koch) Ietsw. -- accepted
  Orobanchaceae -- accepted -- broomrape
  Orobanche L. -- accepted -- broomrape
  Orobanche americana L. -- not accepted
  Orobanche bulbosa (A. Gray) Beck -- accepted -- chaparral broomrape
  Orobanche californica Cham. & Schltdl. -- accepted -- California broomrape
  Orobanche californica ssp. californica Cham. & Schltdl. -- accepted -- California broomrape
  Orobanche californica ssp. condensa Heckard -- accepted -- California broomrape
  Orobanche californica ssp. feudgei (Munz) Heckard -- accepted -- California broomrape
  Orobanche californica ssp. grandis Heckard -- accepted -- California broomrape
  Orobanche californica ssp. grayana (Beck) Heckard -- accepted -- Gray's broomrape
  Orobanche californica ssp. jepsonii (Munz) Heckard -- accepted -- Jepson's broomrape
  Orobanche californica var. claremontensis Munz -- not accepted
  Orobanche californica var. corymbosa (Rydb.) Munz -- not accepted
  Orobanche californica var. grayana (Beck) Cronquist -- not accepted
  Orobanche californica var. parishii Jeps. -- not accepted
  Orobanche cernua Loefl. -- accepted -- nodding broomrape
  Orobanche cooperi (A. Gray) A. Heller -- accepted -- Cooper's broomrape, desert broomrape
  Orobanche cooperi ssp. cooperi (A. Gray) A. Heller -- accepted -- Cooper's broomrape, desert broomrape
  Orobanche cooperi ssp. latiloba (Munz) T.S. Collins ined. -- not accepted -- Cooper's broomrape, desert broomrape
  Orobanche corymbosa (Rydb.) Ferris -- accepted -- Rydberg's broomrape, flat-top broomrape
  Orobanche corymbosa ssp. corymbosa (Rydb.) Ferris -- accepted -- flattop broomrape, flat-top broomrape
  Orobanche corymbosa ssp. mutabilis Heckard -- accepted -- flat-top broomrape
  Orobanche crenata Forssk. -- accepted -- bean broomrape
  Orobanche dugesii (S. Watson) Munz -- accepted -- Duges' broomrape
  Orobanche fasciculata Nutt. -- accepted -- tufted broomrape, clustered broom-rape, purple broomrape, clustered broomrape
  Orobanche fasciculata var. franciscana Achey -- not accepted
  Orobanche fasciculata var. lutea (Parry) Achey -- not accepted
  Orobanche fasciculata var. subulata Goodman -- not accepted
  Orobanche fasciculata var. typica Achey -- not accepted
  Orobanche grayana Beck -- not accepted
  Orobanche grayana var. feudgei Munz -- not accepted
  Orobanche grayana var. jepsonii Munz -- not accepted
  Orobanche grayana var. nelsonii Munz -- not accepted
  Orobanche grayana var. violacea (Eastw.) Munz -- not accepted
  Orobanche hederae Duby -- accepted -- ivy broomrape
  Orobanche ludoviciana Nutt. -- accepted -- Louisiana broom-rape, Louisiana broomrape
  Orobanche ludoviciana ssp. ludoviciana Nutt. -- accepted -- Louisiana broom-rape, sand broomrape, Louisiana broomrape
  Orobanche ludoviciana ssp. multiflora (Nutt.) T.S. Collins ex H.L. White & W.C. Holmes -- accepted -- manyflowered broomrape, Louisiana broomrape, manyflower broomrape
  Orobanche ludoviciana var. arenosa (Suksd.) Cronquist -- not accepted
  Orobanche ludoviciana var. cooperi (A. Gray) Beck -- not accepted
  Orobanche ludoviciana var. genuina Beck -- not accepted
  Orobanche ludoviciana var. latiloba Munz -- not accepted
  Orobanche ludoviciana var. multiflora (Nutt.) Beck -- not accepted
  Orobanche ludoviciana var. valida (Jeps.) Munz -- not accepted
  Orobanche minor Sm. -- accepted -- small broomrape, hellroot
  Orobanche multicaulis Brandegee -- accepted -- spiked broomrape
  Orobanche multicaulis ssp. palmeri (Munz) Collins, ined. -- not accepted -- Palmer's broomrape
  Orobanche multicaulis var. genuina Munz -- not accepted
  Orobanche multicaulis var. multicaulis Brandegee -- accepted
  Orobanche multicaulis var. palmeri Munz -- accepted
  Orobanche multiflora Nutt. -- not accepted
  Orobanche multiflora var. arenosa (Suksd.) Munz -- not accepted
  Orobanche multiflora var. pringlei Munz -- not accepted
  Orobanche multiflora var. typica Munz -- not accepted
  Orobanche multiflora var. xanthochroa (A. Nelson & Cockerell) Munz -- not accepted
  Orobanche parishii (Jeps.) Heckard -- accepted -- Parish's broomrape
  Orobanche parishii ssp. brachyloba Heckard -- accepted -- Parish's broomrape, short-lobed broomrape
  Orobanche parishii ssp. parishii (Jeps.) Heckard -- accepted -- Parish's broomrape
  Orobanche pinorum Geyer ex Hook. -- accepted -- conifer broomrape
  Orobanche porphyrantha Beck -- not accepted
  Orobanche purpurea Jacq. -- not accepted
  Orobanche ramosa L. -- accepted -- branched broomrape, hemp broomrape
  Orobanche riparia L.T. Collins -- accepted -- river broomrape
  Orobanche sedii (Suksd.) Fernald -- not accepted
  Orobanche terrae-novae Fernald -- not accepted
  Orobanche uniflora L. -- accepted -- naked broom-rape, naked broomrape, oneflowered broomrape
  Orobanche uniflora ssp. occidentalis (Greene) Abrams ex Ferris -- not accepted
  Orobanche uniflora var. minuta (Suksd.) Beck -- not accepted
  Orobanche uniflora var. occidentalis (Greene) Roy L. Taylor & MacBryde -- not accepted
  Orobanche uniflora var. purpurea (A. Heller) Achey -- not accepted
  Orobanche uniflora var. sedii (Suksd.) Achey -- not accepted
  Orobanche uniflora var. terrae-novae (Fernald) Achey -- not accepted
  Orobanche uniflora var. typica Achey -- not accepted
  Orobanche uniflora var. uniflora L. -- not accepted
  Orobanche valida Jeps. -- accepted -- Rock Creek broomrape
  Orobanche valida ssp. howellii Heckard & L.T. Collins -- accepted -- Howell's broomrape
  Orobanche valida ssp. valida Jeps. -- accepted -- Rock Creek broomrape
  Orobanche vallicola (Jeps.) Heckard -- accepted -- hillside broomrape
  Orobanche xanthochroa A. Nelson & Cockerell -- not accepted
  Orthocarpus Nutt. -- accepted -- owl's-clover, owlclover
  Orthocarpus attenuatus A. Gray -- not accepted
  Orthocarpus barbatus J.S. Cotton -- accepted -- Grand Coulee owl's-clover
  Orthocarpus bracteosus Benth. -- accepted -- rosy owl's-clover
  Orthocarpus bracteosus var. albus D.D. Keck -- not accepted
  Orthocarpus brevistylus Hoover -- not accepted
  Orthocarpus campestris Benth. -- not accepted
  Orthocarpus campestris var. succulentus Hoover -- not accepted
  Orthocarpus castillejoides Benth. -- not accepted
  Orthocarpus castillejoides var. castillejoides Benth. -- not accepted -- johnnynip
  Orthocarpus castillejoides var. humboldtiensis D.D. Keck -- not accepted
  Orthocarpus castillejoides var. insalutatus Jeps. -- not accepted
  Orthocarpus copelandii Eastw. -- not accepted
  Orthocarpus copelandii var. cryptanthus (Piper) D.D. Keck -- not accepted
  Orthocarpus cuspidatus Greene -- accepted -- Siskiyou Mountain owlclover, toothed owl's-clover
  Orthocarpus cuspidatus ssp. copelandii (Eastw.) T.I. Chuang & Heckard -- accepted -- Copeland's owlclover, Copeland's owl's-clover
  Orthocarpus cuspidatus ssp. cryptanthus (Piper) T.I. Chuang & Heckard -- accepted -- cryptantha owl's-clover, cryptantha owlclover
  Orthocarpus cuspidatus ssp. cuspidatus Greene -- accepted -- Siskiyou Mountain owl's-clover
  Orthocarpus densiflorus Benth. -- not accepted
  Orthocarpus densiflorus var. densiflorus Benth. -- not accepted -- Sierran foothill owlclover
  Orthocarpus densiflorus var. gracilis (Benth.) D.D. Keck -- not accepted
  Orthocarpus densiflorus var. noctuinus (Eastw.) J.T. Howell -- not accepted
  Orthocarpus densiflorus var. obispoensis D.D. Keck -- not accepted
  Orthocarpus erianthus Benth. -- not accepted
  Orthocarpus erianthus var. erianthus Benth. -- not accepted -- johnnytuck
  Orthocarpus erianthus var. gratiosus Jeps. & J.P. Tracy -- not accepted
  Orthocarpus erianthus var. micranthus (Greene ex A. Heller) Jeps. -- not accepted
  Orthocarpus erianthus var. roseus A. Gray -- not accepted
  Orthocarpus exsertus A. Heller -- not accepted
  Orthocarpus faucibarbatus A. Gray -- not accepted
  Orthocarpus faucibarbatus ssp. albidus D.D. Keck -- not accepted
  Orthocarpus faucibarbatus var. albidus (D.D. Keck) J.T. Howell -- not accepted
  Orthocarpus faucibarbatus var. faucibarbatus A. Gray -- not accepted -- bearded owlclover
  Orthocarpus floribundus Benth. -- not accepted
  Orthocarpus hispidus Benth. -- not accepted
  Orthocarpus imbricatus Torr. ex S. Watson -- accepted -- mountain owl's-clover
  Orthocarpus lacerus Benth. -- not accepted
  Orthocarpus lasiorhynchus A. Gray -- not accepted
  Orthocarpus lineariilobus Benth. -- not accepted
  Orthocarpus linearilobus Benth. -- not accepted
  Orthocarpus lithospermoides Benth. -- not accepted
  Orthocarpus lithospermoides var. bicolor (A. Heller) Jeps. -- not accepted
  Orthocarpus lithospermoides var. lithospermoides Benth. -- not accepted -- creamsacs
  Orthocarpus luteus Nutt. -- accepted -- golden-tongue owl-clover, yellow owlclover, yellow owl's-clover
  Orthocarpus micranthus Greene ex A. Heller -- not accepted
  Orthocarpus pachystachyus A. Gray -- accepted -- Shasta orthocarpus, Shasta owl's-clover
  Orthocarpus pilosus S. Watson -- not accepted
  Orthocarpus purpurascens Benth. -- not accepted
  Orthocarpus purpurascens var. latifolius S. Watson -- not accepted
  Orthocarpus purpurascens var. ornatus Jeps. -- not accepted
  Orthocarpus purpurascens var. pallidus D.D. Keck -- not accepted
  Orthocarpus purpurascens var. palmeri A. Gray -- not accepted
  Orthocarpus purpurascens var. purpurascens Benth. -- not accepted -- red owlclover
  Orthocarpus purpurascens var. venustus (A. Heller) D.D. Keck -- not accepted
  Orthocarpus purpureoalbus A. Gray ex S. Watson -- accepted -- purple owlclover, purplewhite owlclover, purplewhite owl's-clover
  Orthocarpus pusillus Benth. -- not accepted
  Orthocarpus pusillus var. densiuscuus (Gand.) D.D. Keck -- not accepted
  Orthocarpus succulentus (Hoover) Hoover -- not accepted
  Orthocarpus tenuifolius (Pursh) Benth. -- accepted -- thinleaved owl's-clover
  Orthocarpus tolmiei Hook. & Arn. -- accepted -- Tolmie's owl's-clover
  Orthocarpus tolmiei ssp. holmgreniorum T.I. Chuang & Heckard -- accepted -- Noel's owl's-clover
  Orthocarpus tolmiei ssp. tolmiei Hook. & Arn. -- accepted -- Tolmie's owl's-clover
  Orthodon dianthera (Buch.-Ham. ex Roxb.) Hand.-Mazz. -- not accepted
  Orthosiphon Benth. -- accepted
  Osmanthus Lour. -- accepted -- devilwood
  Osmanthus americanus (L.) Benth. & Hook. f. ex A. Gray -- accepted -- devilwood
  Osmanthus americanus var. americanus (L.) Benth. & Hook. f. ex A. Gray -- accepted -- American devilwood, devilwood
  Osmanthus americanus var. megacarpus (Small) P.S. Greene -- accepted -- devilwood
  Osmanthus delavayi Franch. -- accepted
  Osmanthus floridanus Chapm. -- not accepted
  Osmanthus fragrans Lour. -- accepted -- sweet osmanthus
  Osmanthus heterophyllus (G. Don) P.S. Green -- accepted -- holly osmanthus
  Osmanthus ilicifolius (Hassk.) Mouill. -- not accepted
  Osmanthus megacarpus (Small) Small ex Little -- not accepted
  Osmanthus sandwicensis (A. Gray) Knobl. -- not accepted
  Osmanthus X fortunei Carričre -- accepted -- Fortune's osmanthus
  Otophylla auriculata (Michx.) Small -- not accepted
  Otophylla densiflora (Benth.) Small -- not accepted
  Pachyptera alliacea (Lam.) A.H. Gentry -- not accepted
  Pachystachys Nees -- accepted
  Pachystachys lutea Nees -- accepted -- lollipop-plant
  Pachystachys riedeliana Nees -- not accepted
  Pachystachys spicata (Ruiz & Pav.) Wassh. -- accepted -- cardinal's-guard
  Pagesia acuminata (Walter) Pennell -- not accepted
  Paragonia Bureau -- accepted
  Paragonia pyramidata (Rich.) Bureau -- accepted
  Parentucellia Viv. -- accepted -- glandweed
  Parentucellia latifolia (L.) Caruel -- accepted -- broadleaf glandweed
  Parentucellia viscosa (L.) Caruel -- accepted -- yellow glandweed
  Parmentiera DC. -- accepted
  Parmentiera aculeata (Kunth) Seem. -- accepted -- cuachilote
  Parmentiera cereifera Seem. -- accepted -- candle tree
  Parmentiera edulis DC. -- not accepted
  Pattersonia caroliniensis J.F. Gmel. -- not accepted
  Paulownia Siebold & Zucc. -- accepted
  Paulownia imperialis Siebold & Zucc. -- not accepted
  Paulownia tomentosa (Thunb.) Steud. -- accepted -- royal paulownia, princess tree
  Paulowniaceae -- accepted
  Pedaliaceae -- accepted -- pedaliums
  Pediculariopsis verticillata (L.) Á. Löve & D. Löve -- not accepted
  Pedicularis L. -- accepted -- lousewort
  Pedicularis albertae Hultén -- not accepted
  Pedicularis albolabiata (Hultén) Kozhevn. -- not accepted
  Pedicularis albomarginata M.E. Jones -- not accepted
  Pedicularis anaticeps Pennell -- not accepted
  Pedicularis angustifolia Benth. -- accepted -- Mogollon Mountain lousewort
  Pedicularis angustissima Greene -- not accepted
  Pedicularis arctica R. Br. -- not accepted
  Pedicularis atrosanguinea Pennell & J.W. Thomp. -- not accepted
  Pedicularis attenuata Benth. -- not accepted
  Pedicularis attolens A. Gray -- not accepted
  Pedicularis attollens A. Gray -- accepted -- little elephantshead
  Pedicularis attollens ssp. attollens A. Gray -- accepted -- little elephantshead
  Pedicularis attollens ssp. protogyna Pennell -- accepted -- little elephantshead
  Pedicularis aurantiaca (E.F. Sprague) Monfils & Prather -- accepted -- Indian warrior
  Pedicularis auriculata Sm. -- not accepted
  Pedicularis bracteosa Benth. -- accepted -- bracted lousewort
  Pedicularis bracteosa ssp. paysoniana (Pennell) W.A. Weber -- not accepted
  Pedicularis bracteosa var. atrosanguinea (Pennell & J.W. Thomp.) Cronquist -- accepted -- bracted lousewort
  Pedicularis bracteosa var. bracteosa Benth. -- accepted -- bracted lousewort
  Pedicularis bracteosa var. canbyi (A. Gray) Cronquist -- accepted -- Canby's lousewort
  Pedicularis bracteosa var. flavida (Pennell) Cronquist -- accepted -- towering lousewort
  Pedicularis bracteosa var. latifolia (Pennell) Cronquist -- accepted -- widepetal lousewort
  Pedicularis bracteosa var. pachyrhiza (Pennell) Cronquist -- accepted -- towering lousewort
  Pedicularis bracteosa var. paysoniana (Pennell) Cronquist -- accepted -- Payson's lousewort
  Pedicularis bracteosa var. siifolia (Rydb.) Cronquist -- accepted -- smoothflower lousewort
  Pedicularis brunnescens A. Heller -- not accepted
  Pedicularis canadensis L. -- accepted -- early lousewort, Canadian lousewort
  Pedicularis canadensis ssp. canadensis L. -- not accepted -- Canadian lousewort
  Pedicularis canadensis ssp. canadensis var. canadensis L. -- not accepted -- Canadian lousewort
  Pedicularis canadensis ssp. canadensis var. dobbsii Fernald -- not accepted -- Canadian lousewort
  Pedicularis canadensis ssp. fluviatilis (A. Heller) W.A. Weber -- not accepted -- Canadian lousewort
  Pedicularis canadensis var. dobbsii Fernald -- not accepted
  Pedicularis canbyi A. Gray -- not accepted
  Pedicularis capitata M.F. Adams -- accepted -- capitate lousewort
  Pedicularis centranthera A. Gray -- accepted -- dwarf lousewort
  Pedicularis centranthera var. exulans M. Peck -- not accepted
  Pedicularis chamissonis Steven -- accepted -- Chamisso's lousewort
  Pedicularis concinna Eastw. ex C.F. Baker -- not accepted
  Pedicularis contorta Benth. -- accepted -- coiled lousewort
  Pedicularis contorta var. contorta Benth. -- accepted -- coiled lousewort
  Pedicularis contorta var. ctenophora (Rydb.) A. Nelson & J.F. Macbr. -- accepted -- coiled lousewort
  Pedicularis contorta var. rubicunda R.N. Reese -- accepted -- coiled lousewort
  Pedicularis crenulata Benth. -- accepted -- meadow lousewort
  Pedicularis ctenophora Rydb. -- not accepted
  Pedicularis cystopteridifolia Rydb. -- accepted -- fernleaved pedicularis
  Pedicularis densiflora Benth. ex Hook. -- accepted -- Indian warrior
  Pedicularis densiflora ssp. aurantiaca E.F. Sprague -- not accepted -- Indian warrior
  Pedicularis densiflora ssp. densiflora Benth. ex Hook. -- not accepted -- Indian warrior
  Pedicularis dudleyi Elmer -- accepted -- Dudley's lousewort
  Pedicularis elata sensu Pursh -- not accepted
  Pedicularis euphrasioides Stephan ex Willd. -- not accepted
  Pedicularis flammea L. -- accepted -- redrattle
  Pedicularis flavida Pennell -- not accepted
  Pedicularis fluviatilis A. Heller -- not accepted
  Pedicularis furbishiae S. Watson -- accepted -- St. Johns River lousewort, Furbish's lousewort, Furbish lousewort
  Pedicularis gladiata Michx. -- not accepted
  Pedicularis grayi A. Nelson -- accepted -- giant lousewort
  Pedicularis groenlandica Retz. -- accepted -- bull elephant's-head, elephanthead lousewort
  Pedicularis groenlandica ssp. groenlandica Retz. -- not accepted
  Pedicularis groenlandica ssp. surrecta (Benth.) Piper -- not accepted -- Greenland lousewort
  Pedicularis groenlandica var. surrecta (Benth.) A. Gray -- not accepted
  Pedicularis hallii Rydb. -- not accepted
  Pedicularis hians Eastw. -- not accepted
  Pedicularis hirsuta L. -- accepted -- hairy lousewort
  Pedicularis howellii A. Gray -- accepted -- Howell lousewort, Howell's lousewort
  Pedicularis kanei Durand -- not accepted -- woolly lousewort
  Pedicularis kanei ssp. kanei Durland -- not accepted
  Pedicularis kanei ssp. yukonensis (A.E. Porsild) Kartesz, ined. -- not accepted
  Pedicularis labradorica Wirsing -- accepted -- Labrador lousewort
  Pedicularis labradorica var. labradorica Wirsing -- not accepted -- Labrador lousewort
  Pedicularis labradorica var. sulphurea Hultén -- not accepted -- Labrador lousewort
  Pedicularis lanata Cham. & Schltdl. -- accepted -- woolly lousewort
  Pedicularis lanata ssp. lanata Cham. & Schltdl. -- not accepted -- woolly lousewort
  Pedicularis lanata ssp. yukonensis A.E. Porsild -- not accepted
  Pedicularis lanceolata Michx. -- accepted -- swamp lousewort
  Pedicularis langsdorffii Fisch. ex Steven -- accepted -- Langsdorf's lousewort
  Pedicularis langsdorffii ssp. arctica (R. Br.) Pennell -- accepted -- arctic lousewort
  Pedicularis langsdorffii ssp. langsdorffii Fisch. ex Steven -- accepted -- Langsdorf's lousewort
  Pedicularis langsdorffii var. arctica (R. Br.) Polunin -- not accepted
  Pedicularis langsdorfii Fisch. ex Steven -- not accepted -- Langsdorf's lousewort
  Pedicularis langsdorfii ssp. arctica (R. Br.) Pennell -- not accepted -- arctic lousewort
  Pedicularis langsdorfii ssp. langsdorfii Fisch. ex Steven -- not accepted -- Langsdorf's lousewort
  Pedicularis langsdorfii var. arctica (R. Br.) Polunin -- not accepted
  Pedicularis lapponica L. -- accepted -- Lapland lousewort
  Pedicularis latifolia Pennell -- not accepted
  Pedicularis lunata Rydb. -- not accepted
  Pedicularis macrodonta Richardson -- accepted -- muskeg lousewort
  Pedicularis melampyroides Rich. -- not accepted
  Pedicularis mogollonica Greene -- not accepted
  Pedicularis montanensis Rydb. -- not accepted
  Pedicularis nelsonii R. Br. -- not accepted
  Pedicularis oederi Vahl ex Hornem. -- accepted -- Oeder's lousewort
  Pedicularis oederi var. albertae (Hultén) B. Boivin -- not accepted
  Pedicularis ornithorhyncha Benth. -- accepted -- ducksbill lousewort
  Pedicularis pachyrhiza Pennell -- not accepted
  Pedicularis pacifica (Hultén) Kozhevn. -- not accepted
  Pedicularis paddoensis Pennell -- not accepted
  Pedicularis pallida Nutt. -- not accepted
  Pedicularis palustris L. -- accepted -- European purple lousewort, swamp-lousewort
  Pedicularis palustris ssp. palustris L. -- accepted -- European purple lousewort, swamp-lousewort
  Pedicularis parryi A. Gray -- accepted -- Parry's cinchweed, Parry's lousewort
  Pedicularis parryi ssp. mogollonica (Greene) G.D. Carr -- accepted -- Mogollon lousewort
  Pedicularis parryi ssp. parryi A. Gray -- accepted -- Parry's lousewort
  Pedicularis parryi ssp. purpurea (Parry) G.D. Carr -- accepted -- Rocky Mountain lousewort
  Pedicularis parryi var. mogollonica (Greene) Dorn -- not accepted
  Pedicularis parryi var. purpurea Parry -- not accepted
  Pedicularis parviflora Sm. -- accepted -- smallflower lousewort
  Pedicularis parviflora ssp. parviflora Sm. -- not accepted -- smallflower lousewort
  Pedicularis parviflora ssp. pennellii (Hultén) Hultén -- not accepted -- Pennell's lousewort
  Pedicularis parviflora var. macrodonta (Richardson) S.L. Welsh -- not accepted
  Pedicularis paysoniana Pennell -- not accepted
  Pedicularis pedicellata Bunge -- not accepted
  Pedicularis pennellii Hultén -- accepted
  Pedicularis pennellii var. insularis (Calder & Roy L. Taylor) B. Boivin -- not accepted
  Pedicularis procera A. Gray -- not accepted -- gray lousewort, giant lousewort
  Pedicularis pulchella Pennell -- accepted -- mountain lousewort
  Pedicularis racemosa Douglas ex Benth. -- accepted -- parrot's-beak, sickletop lousewort
  Pedicularis racemosa ssp. alba Pennell -- accepted -- sickletop lousewort
  Pedicularis racemosa ssp. racemosa Douglas ex Benth. -- accepted -- sickletop lousewort
  Pedicularis racemosa var. alba (Pennell) Cronquist -- not accepted
  Pedicularis rainierensis Pennell & F.A. Warren -- accepted -- Mt. Rainier lousewort
  Pedicularis romanzovii Cham. ex Spreng. -- not accepted
  Pedicularis scopulorum (A. Gray) A. Gray -- not accepted
  Pedicularis semibarbata A. Gray -- accepted -- bearded lousewort, pinewoods lousewort
  Pedicularis semibarbata ssp. charlestonensis (Pennell & Clokey) Clokey -- not accepted
  Pedicularis semibarbata var. charlestonensis Pennell & Clokey -- accepted -- Charleston pinewood lousewort, Charleston lousewort
  Pedicularis semibarbata var. semibarbata A. Gray -- accepted -- pinewoods lousewort
  Pedicularis siifolia Rydb. -- not accepted
  Pedicularis subnuda Benth. -- not accepted
  Pedicularis sudetica Willd. -- accepted -- sudetic lousewort
  Pedicularis sudetica ssp. albolabiata Hultén -- accepted -- sudetic lousewort
  Pedicularis sudetica ssp. arctoeuropaea Hultén -- accepted -- sudetic lousewort
  Pedicularis sudetica ssp. interioides Hultén -- not accepted -- pédiculaire des sudčtes sous-espčce ŕ bractées dilatées, sudetic lousewort
  Pedicularis sudetica ssp. interior (Hultén) Hultén -- accepted -- sudetic lousewort
  Pedicularis sudetica ssp. pacifica Hultén -- accepted -- Pacific lousewort
  Pedicularis sudetica ssp. scopulorum (A. Gray) Hultén -- accepted -- sudetic lousewort
  Pedicularis sudetica var. bicolor Walp. -- not accepted
  Pedicularis sudetica var. gymnocephala Trautv. -- not accepted
  Pedicularis sudetica var. pacifica (Hultén) S.L. Welsh -- not accepted
  Pedicularis sudetica var. scopulorum A. Gray -- not accepted
  Pedicularis sylvatica L. -- accepted -- small lousewort, lousewort
  Pedicularis thompsonii Pennell -- not accepted
  Pedicularis versicolor Wahlenb. -- not accepted
  Pedicularis verticillata L. -- accepted -- whorled lousewort
  Pedicularis virginica Poir. -- not accepted
  Pedicularis willdenowii Vved. -- not accepted
  Penstemon Schmidel -- accepted -- penstémons, beardtongue
  Penstemon abietinus Pennell -- accepted -- firleaf beardtongue
  Penstemon absarokensis Evert -- accepted -- Absaroka Range beardtongue, Absaroka beardtongue
  Penstemon acaulis L.O. Williams -- accepted -- stemless beardtongue
  Penstemon acaulis var. yampaensis (Penland) Neese -- not accepted
  Penstemon acuminatus Douglas ex Lindl. -- accepted -- sharpleaf penstemon, sand-dune beardtongue
  Penstemon acuminatus var. acuminatus Douglas ex Lindl. -- accepted -- sharpleaf penstemon
  Penstemon acuminatus var. latebracteatus N.H. Holmgren -- accepted -- sharpleaf penstemon
  Penstemon aggregatus Pennell -- not accepted
  Penstemon alamosensis Pennell & G.T. Nisbet -- accepted -- Los Alamos beardtongue, Alamo beardtongue
  Penstemon albertinus Greene -- accepted -- Alberta beardtongue
  Penstemon albidus Nutt. -- accepted -- white penstemon
  Penstemon albifluvis England -- not accepted
  Penstemon albomarginatus M.E. Jones -- accepted -- whitemargin beardtongue, white margin penstemon, whitemargin penstemon, white-margined penstemon
  Penstemon alluviorum Pennell -- not accepted -- lowland beardtongue
  Penstemon alpinus Torr. -- not accepted
  Penstemon alpinus ssp. brandegeei (Porter) Penland -- not accepted
  Penstemon alpinus ssp. magnus (Pennell) Penland -- not accepted
  Penstemon alpinus var. alpinus Torr. -- not accepted
  Penstemon ambiguus Torr. -- accepted -- gilia penstemon, bush penstemon, gilia beardtongue
  Penstemon ambiguus ssp. laevissimus D.D. Keck -- not accepted
  Penstemon ambiguus var. ambiguus Torr. -- accepted -- gilia penstemon, gilia beardtongue
  Penstemon ambiguus var. laevissimus (D.D. Keck) N.H. Holmgren -- accepted -- pink plains beardtongue, gilia penstemon, pink plains penstemon
  Penstemon ammophilus N.H. Holmgren & L.M. Shultz -- accepted -- sandloving penstemon
  Penstemon anguineus Eastw. -- accepted -- Siskiyou beardtongue
  Penstemon angustifolius Nutt. ex Pursh -- accepted -- broadbeard beardtongue, broad-beard beardtongue, narrowleaf penstemon
  Penstemon angustifolius ssp. caudatus (A. Heller) D.D. Keck -- not accepted
  Penstemon angustifolius ssp. venosus D.D. Keck -- not accepted
  Penstemon angustifolius var. angustifolius Nutt. ex Pursh -- accepted -- broadbeard beardtongue, broad-beard beardtongue
  Penstemon angustifolius var. caudatus (A. Heller) Rydb. -- accepted -- broadbeard beardtongue
  Penstemon angustifolius var. dulcis Neese -- accepted -- broadbeard beardtongue
  Penstemon angustifolius var. venosus (D.D. Keck) N.H. Holmgren -- accepted -- broadbeard beardtongue, broadbeard penstemon
  Penstemon angustifolius var. vernalensis N.H. Holmgren -- accepted -- broadbeard beardtongue
  Penstemon antirrhinoides Benth. -- not accepted
  Penstemon antirrhinoides ssp. microphyllus (A. Gray) D.D. Keck -- not accepted
  Penstemon arenarius Greene -- accepted -- sanddune penstemon, Nevada sanddune beardtongue
  Penstemon arenicola A. Nelson -- accepted -- sand penstemon
  Penstemon aridus Rydb. -- accepted -- stiffleaf penstemon
  Penstemon arkansanus Pennell -- accepted -- Arkansas beardtongue
  Penstemon arkansanus var. pubescens Pennell -- not accepted
  Penstemon assurgens D.D. Keck -- not accepted
  Penstemon attenuatus Douglas ex Lindl. -- accepted -- sulphur penstemon
  Penstemon attenuatus ssp. militaris (Greene) D.D. Keck -- not accepted
  Penstemon attenuatus ssp. palustris (Pennell) D.D. Keck -- not accepted
  Penstemon attenuatus ssp. pseudoprocerus (Rydb.) D.D. Keck -- not accepted
  Penstemon attenuatus var. attenuatus Douglas ex Lindl. -- accepted -- sulphur penstemon
  Penstemon attenuatus var. militaris (Greene) Cronquist -- accepted -- South Idaho penstemon
  Penstemon attenuatus var. palustris (Pennell) Cronquist -- accepted -- sulphur beardtongue
  Penstemon attenuatus var. pseudoprocerus (Rydb.) Cronquist -- accepted -- small penstemon
  Penstemon atwoodii S.L. Welsh -- accepted -- Kaiparowits beardtongue
  Penstemon auriberbis Pennell -- accepted -- Colorado beardtongue
  Penstemon australis Small -- accepted -- Eustis Lake beardtongue
  Penstemon australis ssp. australis Small -- not accepted -- Eustis Lake beardtongue
  Penstemon australis ssp. laxiflorus (Pennell) R.W. Benn. -- not accepted -- Eustis Lake beardtongue
  Penstemon australis var. ameles Crosswh. -- not accepted
  Penstemon azureus Benth. -- accepted -- azure penstemon
  Penstemon azureus ssp. angustissimus (A. Gray) D.D. Keck -- not accepted -- azure penstemon
  Penstemon azureus ssp. azureus Benth. -- not accepted -- azure penstemon
  Penstemon azureus var. angustissimus A. Gray -- accepted -- azure penstemon
  Penstemon azureus var. azureus Benth. -- accepted -- beardtongue
  Penstemon azureus var. parvulus A. Gray -- not accepted -- azure penstemon
  Penstemon baccharifolius Hook. -- accepted -- baccharisleaf beardtongue
  Penstemon barbatus (Cav.) Roth -- accepted -- beardlip penstemon
  Penstemon barbatus ssp. barbatus (Cav.) Roth -- not accepted -- beardlip penstemon
  Penstemon barbatus ssp. torreyi (Benth.) D.D. Keck -- not accepted -- Torrey's penstemon
  Penstemon barbatus ssp. trichander (A. Gray) D.D. Keck -- not accepted -- beardlip penstemon
  Penstemon barbatus var. barbatus (Cav.) Roth -- accepted -- beardlip penstemon
  Penstemon barbatus var. puberulus A. Gray -- not accepted
  Penstemon barbatus var. torreyi (Benth.) A. Gray -- accepted -- beardlip penstemon
  Penstemon barbatus var. trichander A. Gray -- accepted -- Torrey's penstemon
  Penstemon barnebyi N.H. Holmgren -- accepted -- Barneby's penstemon, White River Valley beardtongue
  Penstemon barrettiae A. Gray -- accepted -- Barrett's beardtongue
  Penstemon bicolor (Brandegee) Clokey & D.D. Keck -- accepted -- pinto beardtongue, pinto penstemon
  Penstemon bicolor ssp. bicolor (Brandegee) Clokey & D.D. Keck -- not accepted -- twocolor penstemon, pinto beardtongue
  Penstemon bicolor ssp. roseus Clokey & D.D. Keck -- not accepted -- pinto beardtongue, pinto penstemon, rosey pinto penstemon
  Penstemon bracteatus D.D. Keck -- accepted -- Red Canyon beardtongue
  Penstemon bradburii Pursh -- not accepted
  Penstemon brandegeei (Porter) Rydb. -- not accepted
  Penstemon brevibarbatus Crosswh. -- not accepted
  Penstemon breviculus (D.D. Keck) G.T. Nisbet & R.C. Jacks. -- accepted -- shortstem penstemon, shortstem beardtongue
  Penstemon breviflorus Lindl. -- not accepted
  Penstemon breviflorus ssp. glabrisepalus D.D. Keck -- not accepted
  Penstemon brevisepalus Pennell -- accepted
  Penstemon bridgesii A. Gray -- not accepted
  Penstemon bridgesii var. amplexicaulis Monnet -- not accepted
  Penstemon brittoniorum Pennell -- not accepted
  Penstemon buckleyi Pennell -- accepted -- Buckley's penstemon, Buckley's beardtongue
  Penstemon caesius A. Gray -- accepted -- San Bernardino beardtongue
  Penstemon caespitosus Nutt. ex A. Gray -- accepted -- mat penstemon
  Penstemon caespitosus ssp. desertipicti (A. Nelson) D.D. Keck -- not accepted
  Penstemon caespitosus ssp. perbrevis Pennell -- not accepted
  Penstemon caespitosus var. caespitosus Nutt. ex A. Gray -- accepted -- mat penstemon
  Penstemon caespitosus var. desertipicti (A. Nelson) N.H. Holmgren -- accepted -- mat penstemon, tufted penstemon
  Penstemon caespitosus var. perbrevis (Pennell) N.H. Holmgren -- accepted -- mat penstemon
  Penstemon caespitosus var. suffruticosus A. Gray -- not accepted
  Penstemon calcareus Brandegee -- accepted -- limestone beardtongue, limestone penstemon
  Penstemon californicus (Munz & I.M. Johnst.) D.D. Keck -- accepted -- California penstemon
  Penstemon calycosus Small -- accepted -- longsepal beardtongue
  Penstemon campanulatus (Cav.) Willd. -- accepted -- bellflower beardtongue
  Penstemon campanulatus f. pulchellus (Lindl.) Voss -- not accepted
  Penstemon campanulatus ssp. chihuahuensis Straw -- not accepted
  Penstemon campanulatus var. chihuahuensis (Straw) B.L. Turner -- accepted
  Penstemon canescens (Britton) Britton -- accepted -- eastern gray beardtongue
  Penstemon canescens var. brittoniorum (Pennell) Pennell -- not accepted
  Penstemon canescens var. typicus Pennell -- not accepted
  Penstemon cardinalis Wooton & Standl. -- accepted -- cardinal beardtongue
  Penstemon cardinalis ssp. cardinalis Wooton & Standl. -- accepted -- cardinal beardtongue
  Penstemon cardinalis ssp. regalis (A. Nelson) G.T. Nisbet & R.C. Jacks. -- accepted -- cardinal beardtongue
  Penstemon cardwellii Howell -- accepted -- Cardwell's beardtongue
  Penstemon carnosus Pennell -- accepted -- fleshy beardtongue
  Penstemon caryi Pennell -- accepted -- Cary's beardtongue, Cary beardtongue
  Penstemon caudatus A. Heller -- not accepted
  Penstemon centranthifolius (Benth.) Benth. -- accepted -- scarlet bugler
  Penstemon cinerascens Greene ex C.F. Baker -- not accepted
  Penstemon cinereus Piper -- not accepted
  Penstemon cinereus ssp. foliatus D.D. Keck -- not accepted
  Penstemon cinicola D.D. Keck -- accepted -- ash penstemon
  Penstemon cleburnei M.E. Jones -- not accepted
  Penstemon clevelandii A. Gray -- accepted -- Cleveland's beardtongue
  Penstemon clevelandii ssp. clevelandii A. Gray -- not accepted -- Cleveland's beardtongue
  Penstemon clevelandii ssp. connatus (Munz & I.M. Johnst.) D.D. Keck -- not accepted -- San Jacinto beardtongue
  Penstemon clevelandii ssp. mohavensis D.D. Keck -- not accepted -- Cleveland's beardtongue
  Penstemon clevelandii var. clevelandii A. Gray -- accepted -- Cleveland's beardtongue
  Penstemon clevelandii var. connatus Munz & I.M. Johnst. -- accepted
  Penstemon clevelandii var. mohavensis (D.D. Keck) McMinn -- accepted -- Cleveland's beardtongue
  Penstemon clutei A. Nelson -- accepted -- Sunset Crater beardtongue, Sunset Crater penstemon
  Penstemon cobaea Nutt. -- accepted -- cobaea beardtongue, cobaea penstemon
  Penstemon cobaea ssp. purpureus (Pennell) Pennell -- not accepted
  Penstemon cobaea ssp. typicus Pennell -- not accepted
  Penstemon cobaea var. cobaea Nutt. -- accepted -- cobaea beardtongue
  Penstemon cobaea var. purpureus Pennell -- accepted -- cobaea beardtongue
  Penstemon coloradoensis A. Nelson -- not accepted
  Penstemon comarrhenus A. Gray -- accepted -- dusty penstemon, dusty beardtongue
  Penstemon compactus (D.D. Keck) Crosswh. -- accepted -- compact penstemon, cache beardtongue
  Penstemon concinnus D.D. Keck -- accepted -- Tunnel Springs beardtongue, Tunnel Springs penstemon
  Penstemon confertus Douglas ex Lindl. -- accepted -- yellow penstemon
  Penstemon confertus ssp. procerus (Douglas ex Graham) D.V. Clark -- not accepted
  Penstemon confertus var. procerus (Douglas ex Graham) Coville -- not accepted
  Penstemon confusus M.E. Jones -- accepted -- Owens Valley penstemon, Owens Valley beardtongue
  Penstemon confusus ssp. patens (M.E. Jones) D.D. Keck -- not accepted
  Penstemon congestus (M.E. Jones) Pennell -- not accepted
  Penstemon cordifolius Benth. -- not accepted
  Penstemon corymbosus Benth. -- not accepted
  Penstemon crandallii A. Nelson -- accepted -- Crandall's beardtongue
  Penstemon crandallii ssp. atratus D.D. Keck -- accepted -- Crandall's beardtongue
  Penstemon crandallii ssp. crandallii A. Nelson -- accepted -- Crandall's beardtongue
  Penstemon crandallii ssp. glabrescens (Pennell) D.D. Keck -- accepted -- Crandall's beardtongue
  Penstemon crandallii ssp. glabrescens var. glabrescens (Pennell) D.D. Keck -- not accepted -- Crandall's beardtongue
  Penstemon crandallii ssp. glabrescens var. taosensis (D.D. Keck) G.T. Nisbet & R.C. Jacks. -- not accepted -- Crandall's beardtongue
  Penstemon crandallii ssp. procumbens (Greene) D.D. Keck -- accepted -- Crandall's beardtongue
  Penstemon crandallii ssp. taosensis (D.D. Keck) Kartesz & Gandhi -- not accepted -- Taos penstemon
  Penstemon crandallii var. atratus (D.D. Keck) N.H. Holmgren -- not accepted
  Penstemon crandallii var. taosensis (D.D. Keck) G.T. Nisbet & R.C. Jacks. -- not accepted
  Penstemon cusickii A. Gray -- accepted -- Cusick's beardtongue
  Penstemon cyananthus Hook. -- accepted -- Wasatch beardtongue
  Penstemon cyananthus ssp. compactus D.D. Keck -- not accepted
  Penstemon cyananthus ssp. longiflorus Pennell -- not accepted
  Penstemon cyananthus ssp. subglaber (A. Gray) Pennell -- not accepted
  Penstemon cyananthus var. compactus (D.D. Keck) Neese -- not accepted
  Penstemon cyananthus var. cyananthus Hook. -- accepted -- Wasatch beardtongue
  Penstemon cyananthus var. judyae N.D. Atwood -- accepted -- Wasatch beardtongue
  Penstemon cyananthus var. longiflorus (Pennell) Neese -- not accepted
  Penstemon cyananthus var. subglaber (A. Gray) N.H. Holmgren -- accepted -- Wasatch beardtongue
  Penstemon cyaneus Pennell -- accepted -- blue penstemon
  Penstemon cyanocaulis Payson -- accepted -- bluestem beardtongue
  Penstemon cyathophorus Rydb. -- accepted -- Northpark penstemon, sagebrush beardtongue
  Penstemon dasyphyllus A. Gray -- accepted -- purple penstemon, Cochise beardtongue
  Penstemon davidsonii Greene -- accepted -- timberline penstemon, Davidson's penstemon
  Penstemon davidsonii ssp. menziesii D.D. Keck -- not accepted
  Penstemon davidsonii var. davidsonii Greene -- accepted -- Davidson's penstemon
  Penstemon davidsonii var. ellipticus (J.M. Coult. & Fisher) B. Boivin -- not accepted
  Penstemon davidsonii var. menziesii (D.D. Keck) Cronquist -- accepted -- Menzies' penstemon
  Penstemon davidsonii var. praeteritus Cronquist -- accepted -- timberline beardtongue, timberline penstemon
  Penstemon deamii Pennell -- accepted -- Deam's beardtongue
  Penstemon deaveri Crosswh. -- accepted -- Mt. Graham beardtongue
  Penstemon debilis O'Kane & J.L. Anderson -- accepted -- parachute beardtongue
  Penstemon decurvus Pennell ex Crosswh. -- not accepted
  Penstemon degeneri Crosswh. -- accepted -- Degener's beardtongue, Degener beardtongue
  Penstemon deustus Douglas ex Lindl. -- accepted -- scabland penstemon
  Penstemon deustus ssp. heterander (Torr. & A. Gray) Pennell & D.D. Keck -- not accepted
  Penstemon deustus ssp. sudans (M.E. Jones) Pennell & D.D. Keck -- not accepted
  Penstemon deustus ssp. variabilis (Suksd.) Pennell & D.D. Keck -- not accepted
  Penstemon deustus var. deustus Douglas ex Lindl. -- accepted -- hotrock penstemon, scabland penstemon
  Penstemon deustus var. heterander (Torr. & A. Gray) Cronquist -- not accepted
  Penstemon deustus var. pedicellatus M.E. Jones -- accepted -- scabland penstemon, hotrock penstemon
  Penstemon deustus var. suffrutescens L.F. Hend. -- accepted -- scabland penstemon
  Penstemon deustus var. variabilis (Suksd.) Cronquist -- accepted -- scabland penstemon
  Penstemon digitalis Nutt. ex Sims -- accepted -- talus slope penstemon
  Penstemon diphyllus Rydb. -- accepted -- twoleaf beardtongue
  Penstemon discolor D.D. Keck -- accepted -- Catalina beardtongue
  Penstemon dissectus Elliott -- accepted -- dissected beardtongue
  Penstemon distans N.H. Holmgren -- accepted -- Mount Trumbull beardtongue
  Penstemon dolius M.E. Jones ex Pennell -- accepted -- Jone's penstemon, Jones' beardtongue
  Penstemon dolius var. dolius M.E. Jones ex Pennell -- not accepted -- Jones' beardtongue, Jones' penstemon
  Penstemon dolius var. duchesnensis N.H. Holmgren -- not accepted -- Duchesne penstemon
  Penstemon duchesnensis (N.H. Holmgren) Neese -- accepted -- Duchesne penstemon
  Penstemon eatonii A. Gray -- accepted -- Eaton's penstemon, firecracker penstemon
  Penstemon eatonii ssp. eatonii A. Gray -- accepted -- Eaton's penstemon, firecracker penstemon
  Penstemon eatonii ssp. exsertus (A. Nelson) D.D. Keck -- accepted -- firecracker penstemon, Eaton's penstemon, Eaton's firecracker
  Penstemon eatonii ssp. undosus (M.E. Jones) D.D. Keck -- accepted -- Eaton's penstemon, firecracker penstemon
  Penstemon eatonii var. eatonii A. Gray -- not accepted -- beardtongue
  Penstemon eatonii var. undosus M.E. Jones -- not accepted
  Penstemon elegantulus Pennell -- accepted -- rockvine penstemon
  Penstemon ellipticus J.M. Coult. & Fisher -- accepted -- rocky ledge penstemon
  Penstemon eriantherus Pursh -- accepted -- fuzzytongue penstemon
  Penstemon eriantherus var. argillosus M.E. Jones -- accepted -- fuzzytongue penstemon
  Penstemon eriantherus var. cleburnei (M.E. Jones) Dorn -- accepted -- Cleburn's penstemon
  Penstemon eriantherus var. eriantherus Pursh -- accepted -- fuzzytongue penstemon, fuzzy-tongue beardtongue
  Penstemon eriantherus var. redactus Pennell & D.D. Keck -- accepted -- longsac penstemon
  Penstemon eriantherus var. whitedii (Piper) A. Nelson -- accepted -- Whited's penstemon
  Penstemon euglaucus English -- accepted -- glaucous beardtongue
  Penstemon fendleri Torr. & A. Gray -- accepted -- Fendler's beardtongue, Fendler's penstemon
  Penstemon filiformis (D.D. Keck) D.D. Keck -- accepted -- threadleaf beardtongue, thread-leaved penstemon
  Penstemon flavescens Pennell -- accepted -- high mountain penstemon
  Penstemon floribundus D. Danley -- accepted -- Cordelia beardtongue, Cordillia's beardtongue, Cordillia's penstemon
  Penstemon floridus Brandegee -- accepted -- Panamint penstemon, Panamint beardtongue
  Penstemon floridus ssp. austinii (Eastw.) D.D. Keck -- not accepted
  Penstemon floridus var. austinii (Eastw.) N.H. Holmgren -- accepted -- Austin's beardtongue, Austin's penstemon
  Penstemon floridus var. floridus Brandegee -- accepted -- Panamint penstemon, Panamint beardtongue
  Penstemon flowersii Neese & S.L. Welsh -- accepted -- Flowers' beardtongue
  Penstemon francisci-pennellii Crosswh. -- not accepted
  Penstemon franklinii S.L. Welsh -- accepted -- Franklin's penstemon, Ben Franklin's Beardtongue
  Penstemon fremontii Torr. & A. Gray -- accepted -- Fremont's penstemon, Fremont's beardtongue
  Penstemon fremontii var. fremontii Torr. & A. Gray -- accepted -- Fremont's beardtongue
  Penstemon fremontii var. glabrescens Dorn & Lichvar -- accepted -- Fremont's beardtongue
  Penstemon fruticiformis Coville -- accepted -- Death Valley penstemon, Death Valley beardtongue
  Penstemon fruticiformis ssp. amargosae D.D. Keck -- not accepted -- Death Valley beardtongue, Amargosa penstemon
  Penstemon fruticiformis ssp. fruticiformis Coville -- not accepted -- Death Valley beardtongue
  Penstemon fruticiformis var. amargosae (D.D. Keck) N.H. Holmgren -- accepted -- Death Valley beardtongue
  Penstemon fruticiformis var. fruticiformis Coville -- accepted -- beardtongue
  Penstemon fruticosus (Pursh) Greene -- accepted -- bush penstemon
  Penstemon fruticosus ssp. scouleri (Lindl.) Pennell & D.D. Keck -- not accepted
  Penstemon fruticosus ssp. serratus D.D. Keck -- not accepted
  Penstemon fruticosus var. fruticosus (Pursh) Greene -- accepted -- bush penstemon
  Penstemon fruticosus var. scouleri (Lindl.) Cronquist -- accepted -- littleleaf bush penstemon
  Penstemon fruticosus var. serratus (D.D. Keck) Cronquist -- accepted -- sawleaf bush penstemon
  Penstemon gairdneri Hook. -- accepted -- Gairdner's beardtongue
  Penstemon gairdneri ssp. hians (Piper) D.D. Keck -- not accepted
  Penstemon gairdneri ssp. oreganus (A. Gray) D.D. Keck -- not accepted
  Penstemon gairdneri var. gairdneri Hook. -- accepted -- Gairdner's beardtongue
  Penstemon gairdneri var. hians Piper -- not accepted
  Penstemon gairdneri var. oreganus A. Gray -- accepted -- Gairdner's beardtongue
  Penstemon garrettii Pennell -- not accepted -- Garrett's beardtongue
  Penstemon gentianoides (Kunth) Poir. -- accepted -- gentian beardtongue
  Penstemon gibbensii Dorn -- accepted -- Gibbens' beardtongue, Gibbens beardtongue
  Penstemon glaber Pursh -- accepted -- western smooth beardtongue, sawsepal penstemon
  Penstemon glaber var. alpinus (Torr.) A. Gray -- accepted -- alpine sawsepal penstemon, alpine penstemon
  Penstemon glaber var. brandegeei (Porter) C.C. Freeman -- accepted -- Brandegee's penstemon
  Penstemon glaber var. glaber Pursh -- accepted -- sawsepal penstemon, western smooth beardtongue
  Penstemon glandulosus Douglas -- accepted -- stickystem penstemon
  Penstemon glandulosus ssp. chelanensis D.D. Keck -- not accepted
  Penstemon glandulosus var. chelanensis (D.D. Keck) Cronquist -- accepted -- stickystem penstemon
  Penstemon glandulosus var. glandulosus Douglas -- accepted -- stickystem penstemon
  Penstemon glaucinus Pennell -- accepted -- blueleaf beardtongue
  Penstemon glaucus Graham -- not accepted
  Penstemon globosus (Piper) Pennell & D.D. Keck -- accepted -- globe penstemon
  Penstemon goodrichii N.H. Holmgren -- accepted -- Lapoint beardtongue
  Penstemon gormanii Greene -- accepted -- Gorman's beardtongue
  Penstemon gracilentus A. Gray -- accepted -- slender penstemon
  Penstemon gracilis Nutt. -- accepted -- slender penstemon, lilac penstemon, slender beardtongue
  Penstemon gracilis ssp. wisconsinensis (Pennell) Pennell -- not accepted
  Penstemon gracilis var. gracilis Nutt. -- not accepted -- lilac beardtongue, lilac penstemon
  Penstemon gracilis var. wisconsinensis (Pennell) Fassett -- not accepted -- Wisconsin penstemon
  Penstemon grahamii D.D. Keck -- accepted -- Uinta Basin beardtongue, Graham's beardtongue
  Penstemon grandiflorus Nutt. -- accepted -- largeflowered penstemon, large beardtongue
  Penstemon griffinii A. Nelson -- accepted -- Griffin's beardtongue
  Penstemon grinnellii Eastw. -- accepted -- Grinnell's beardtongue
  Penstemon grinnellii ssp. grinnellii Eastw. -- not accepted -- Grinnell's beardtongue
  Penstemon grinnellii ssp. scrophularioides (M.E. Jones) Munz -- not accepted -- Grinnell's beardtongue
  Penstemon grinnellii var. grinnellii Eastw. -- not accepted -- beardtongue
  Penstemon grinnellii var. scrophularioides (M.E. Jones) N.H. Holmgren -- not accepted -- Grinnell's beardtongue
  Penstemon guadalupensis A. Heller -- accepted -- Guadalupe beardtongue
  Penstemon guadalupensis var. ernstii (Pennell) Cory -- not accepted
  Penstemon hallii A. Gray -- accepted -- Hall's beardtongue
  Penstemon harbourii A. Gray -- accepted -- Harbour's beardtongue
  Penstemon harringtonii Penland -- accepted -- Harrington's beardtongue, Harrington beardtongue
  Penstemon hartwegii Benth. -- accepted -- Hartweg's beardtongue
  Penstemon havardii A. Gray -- accepted -- Big Bend beardtongue
  Penstemon haydenii S. Watson -- accepted -- blowout penstemon, blowout beardtongue
  Penstemon helleri Small -- not accepted
  Penstemon hesperius M. Peck -- not accepted
  Penstemon heterodoxus A. Gray -- accepted -- Sierra penstemon, Sierra beardtongue
  Penstemon heterodoxus ssp. cephalophorus (Greene) D.D. Keck -- not accepted
  Penstemon heterodoxus ssp. heterodoxus A. Gray -- not accepted -- Sierran beardtongue
  Penstemon heterodoxus var. cephalophorus (Greene) N.H. Holmgren -- accepted -- Sierra beardtongue
  Penstemon heterodoxus var. heterodoxus A. Gray -- accepted -- Sierra beardtongue
  Penstemon heterodoxus var. shastensis (D.D. Keck) N.H. Holmgren -- accepted -- Shasta beardtongue
  Penstemon heterophyllus Lindl. -- accepted -- bunchleaf penstemon
  Penstemon heterophyllus ssp. australis (Munz & I.M. Johnst.) D.D. Keck -- not accepted -- foothill beardtongue
  Penstemon heterophyllus ssp. heterophyllus Lindl. -- not accepted -- bunchleaf penstemon
  Penstemon heterophyllus ssp. purdyi D.D. Keck -- not accepted -- Purdy's penstemon
  Penstemon heterophyllus var. australis Munz & I.M. Johnst. -- accepted -- foothill beardtongue
  Penstemon heterophyllus var. heterophyllus Lindl. -- accepted -- buchleaf penstemon
  Penstemon heterophyllus var. purdyi (D.D. Keck) McMinn -- accepted -- Purdy's penstemon
  Penstemon hirsutus (L.) Willd. -- accepted -- hairy beardtongue
  Penstemon hirsutus var. hirsutus (L.) Willd. -- not accepted -- hairy beardtongue
  Penstemon hirsutus var. minimus R.W. Benn. -- not accepted
  Penstemon hirsutus var. pygmaeus R.W. Benn. -- not accepted
  Penstemon holmgrenii S.L. Clark -- not accepted
  Penstemon humilis Nutt. ex A. Gray -- accepted -- low penstemon, low beardtongue
  Penstemon humilis ssp. brevifolius (A. Gray) D.D. Keck -- not accepted -- low beardtongue
  Penstemon humilis ssp. humilis Nutt. ex A. Gray -- not accepted -- low penstemon, low beardtongue
  Penstemon humilis ssp. obtusifolius (Pennell) D.D. Keck -- not accepted -- low beardtongue
  Penstemon humilis var. brevifolius A. Gray -- accepted -- low beardtongue
  Penstemon humilis var. deserticus S.L. Welsh -- not accepted
  Penstemon humilis var. humilis Nutt. ex A. Gray -- accepted -- low beardtongue
  Penstemon humilis var. obtusifolius (Pennell) Reveal -- accepted -- low beardtongue
  Penstemon idahoensis N.D. Atwood & S.L. Welsh -- accepted -- Idaho beardtongue
  Penstemon immanifestus N.H. Holmgren -- accepted -- Steptoe Valley penstemon, Steptoe Valley beardtongue
  Penstemon incertus Brandegee -- accepted -- Mojave beardtongue
  Penstemon inflatus Crosswh. -- accepted -- inflated beardtongue
  Penstemon jamesii Benth. -- accepted -- James' penstemon, James' beardtongue
  Penstemon jamesii ssp. breviculus D.D. Keck -- not accepted
  Penstemon jamesii ssp. ophianthus (Pennell) D.D. Keck -- not accepted
  Penstemon jamesii ssp. typicus D.D. Keck -- not accepted
  Penstemon janishiae N.H. Holmgren -- accepted -- Janish's penstemon, Antelope Valley beardtongue
  Penstemon keckii Clokey -- not accepted
  Penstemon kingii S. Watson -- accepted -- King's penstemon, King's beardtongue
  Penstemon labrosus (A. Gray) Mast. ex Hook. f. -- accepted -- San Gabriel beardtongue
  Penstemon laetus A. Gray -- accepted -- mountain blue penstemon
  Penstemon laetus ssp. laetus A. Gray -- not accepted -- mountain blue penstemon
  Penstemon laetus ssp. leptosepalus (Greene ex A. Gray) D.D. Keck -- not accepted -- mountain blue penstemon
  Penstemon laetus ssp. roezlii (Regel) D.D. Keck -- not accepted -- Roezl's penstemon
  Penstemon laetus ssp. sagittatus D.D. Keck -- not accepted -- mountain blue penstemon
  Penstemon laetus var. laetus A. Gray -- accepted -- beardtongue
  Penstemon laetus var. leptosepalus Greene ex A. Gray -- accepted
  Penstemon laetus var. roezlii (Regel) Jeps. -- not accepted
  Penstemon laetus var. sagittatus (D.D. Keck) McMinn -- accepted
  Penstemon laevigatus Aiton -- accepted -- eastern smooth beardtongue
  Penstemon laevigatus ssp. alluviorum (Pennell) R.W. Benn. -- not accepted
  Penstemon laevigatus ssp. calycosus (Small) R.W. Benn. -- not accepted
  Penstemon laevigatus ssp. digitalis (Nutt. ex Sims) R.W. Benn. -- not accepted
  Penstemon laevigatus var. angulatus R.W. Benn. -- not accepted
  Penstemon laevigatus var. deamii (Pennell) R.W. Benn. -- not accepted
  Penstemon laevis Pennell -- accepted -- southwestern penstemon, southwestern beardtongue
  Penstemon lanceolatus Benth. -- accepted -- lanceleaf beardtongue
  Penstemon laricifolius Hook. & Arn. -- accepted -- larchleaf beardtongue
  Penstemon laricifolius ssp. exilifolius (A. Nelson) D.D. Keck -- not accepted -- larchleaf beardtongue
  Penstemon laricifolius ssp. laricifolius Hook. & Arn. -- not accepted -- larchleaf beardtongue
  Penstemon laricifolius var. exilifolius (A. Nelson) Payson -- accepted -- larchleaf beardtongue
  Penstemon laricifolius var. laricifolius Hook. & Arn. -- accepted -- larchleaf beardtongue
  Penstemon laxiflorus Pennell -- accepted -- nodding beardtongue
  Penstemon laxus A. Nelson -- accepted -- tufted penstemon
  Penstemon leiophyllus Pennell -- accepted -- smoothleaf penstemon, smoothleaf beardtongue
  Penstemon leiophyllus var. francisci-pennellii (Crosswh.) N.H. Holmgren -- accepted -- smoothleaf beardtongue, smoothleaf penstemon
  Penstemon leiophyllus var. keckii (Clokey) N.H. Holmgren -- accepted -- Keck's beardtongue, Keck's penstemon
  Penstemon leiophyllus var. leiophyllus Pennell -- accepted -- smoothleaf beardtongue, smoothleaf penstemon
  Penstemon lemhiensis (D.D. Keck) D.D. Keck & Cronquist -- accepted -- Lemhi penstemon, Lemhi beardtongue
  Penstemon lemmonii A. Gray -- not accepted
  Penstemon lentus Pennell -- accepted -- handsome penstemon, handsome beardtongue
  Penstemon lentus ssp. albiflorus D.D. Keck -- not accepted
  Penstemon lentus var. albiflorus (D.D. Keck) Reveal -- accepted -- handsome beardtongue
  Penstemon lentus var. lentus Pennell -- accepted -- handsome beardtongue
  Penstemon leonardii Rydb. -- accepted -- Leonard's penstemon, Leonard's beardtongue
  Penstemon leonardii var. higginsii Neese -- accepted -- Higgins' beardtongue
  Penstemon leonardii var. leonardii Rydb. -- accepted -- Leonard's beardtongue
  Penstemon leonardii var. patricus (N.H. Holmgren) Neese -- accepted -- Leonard's beardtongue, Leonard's penstemon
  Penstemon leptanthus Pennell -- not accepted -- Sevier Plateau beardtongue
  Penstemon linarioides A. Gray -- accepted -- creeping penstemon, toadflax penstemon
  Penstemon linarioides ssp. coloradoensis (A. Nelson) D.D. Keck -- accepted -- toadflax penstemon, Colorado penstemon
  Penstemon linarioides ssp. compactifolius D.D. Keck -- not accepted -- compact-leaf penstemon, toadflax penstemon, toadflax beardtongue
  Penstemon linarioides ssp. linarioides A. Gray -- accepted -- toadflax penstemon, toadflax beardtongue
  Penstemon linarioides ssp. maguirei D.D. Keck -- accepted -- Maguire's penstemon
  Penstemon linarioides ssp. sileri (A. Gray) D.D. Keck -- accepted -- Siler's penstemon
  Penstemon linarioides ssp. taosensis D.D. Keck -- not accepted
  Penstemon linarioides ssp. typicus D.D. Keck -- not accepted
  Penstemon linarioides var. sileri A. Gray -- not accepted
  Penstemon linarioides var. viridis D.D. Keck -- not accepted
  Penstemon longiflorus (Pennell) S.L. Clark -- accepted -- longflower penstemon
  Penstemon lyallii A. Gray -- accepted -- Lyall's beardtongue
  Penstemon macranthus Eastw. -- not accepted
  Penstemon maguirei Crosswh. -- not accepted
  Penstemon marcusii (D.D. Keck) N.H. Holmgren -- accepted -- Marcus' beardtongue, Jones' beardtongue
  Penstemon mensarum Pennell -- accepted -- tiger beardtongue
  Penstemon menziesii Hook. -- not accepted
  Penstemon menziesii ssp. davidsonii (Greene) Piper -- not accepted
  Penstemon menziesii ssp. thompsonii Pennell & D.D. Keck -- not accepted
  Penstemon metcalfei Wooton & Standl. -- accepted -- Metcalfe's beardtongue
  Penstemon microphyllus A. Gray -- not accepted
  Penstemon minidokanus A. Nelson & J.F. Macbr. -- not accepted
  Penstemon miser A. Gray -- accepted -- Malheur penstemon
  Penstemon modestus Greene -- not accepted
  Penstemon moffatii Eastw. -- accepted -- Moffatt's beardtongue
  Penstemon moffatii ssp. marcusii D.D. Keck -- not accepted
  Penstemon moffatii ssp. moffatii Eastw. -- not accepted -- Moffatt's beardtongue
  Penstemon moffatii ssp. paysonii (Pennell) D.D. Keck -- not accepted -- Moffatt's beardtongue
  Penstemon monoensis A. Heller -- accepted -- Mono penstemon
  Penstemon montanus Greene -- accepted -- cordroot beardtongue
  Penstemon montanus ssp. idahoensis D.D. Keck -- not accepted
  Penstemon montanus var. idahoensis (D.D. Keck) Cronquist -- accepted -- Central Idaho penstemon
  Penstemon montanus var. montanus Greene -- accepted -- cordroot beardtongue
  Penstemon moriahensis N.H. Holmgren -- accepted -- Mount Moriah penstemon, Mt. Moriah beardtongue
  Penstemon mucronatus N.H. Holmgren -- accepted -- Sheep Creek beardtongue, mucronate penstemon
  Penstemon multicaulis Pennell -- not accepted
  Penstemon multiflorus (Benth) Chapm. ex Small -- accepted -- manyflower beardtongue
  Penstemon murrayanus Hook. -- accepted -- scarlet beardtongue
  Penstemon nanus D.D. Keck -- accepted -- dwarf beardtongue, low beardtongue
  Penstemon navajoa N.H. Holmgren -- accepted -- Navajo Mountain beardtongue
  Penstemon nemorosus (Douglas ex Lindl.) Trautv. -- not accepted
  Penstemon neomexicanus Wooton & Standl. -- accepted -- New Mexico beardtongue
  Penstemon neotericus D.D. Keck -- accepted -- Plumas County beardtongue
  Penstemon newberryi A. Gray -- accepted -- pride-of-the-mountains, mountain pride
  Penstemon newberryi ssp. berryi (Eastw.) D.D. Keck -- not accepted -- Berry's penstemon
  Penstemon newberryi ssp. newberryi A. Gray -- not accepted -- Newberry's penstemon, mountain pride
  Penstemon newberryi ssp. sonomensis (Greene) D.D. Keck -- not accepted -- Sonoma penstemon
  Penstemon newberryi var. berryi (Eastw.) N.H. Holmgren -- accepted -- Berry's penstemon
  Penstemon newberryi var. newberryi A. Gray -- accepted -- beardtongue
  Penstemon newberryi var. sonomensis (Greene) Jeps. -- accepted -- Sonoma penstemon
  Penstemon nitidus Douglas ex Benth. -- accepted -- waxleaf penstemon
  Penstemon nitidus ssp. polyphyllus Pennell -- not accepted
  Penstemon nitidus var. nitidus Douglas ex Benth. -- accepted -- waxleaf penstemon
  Penstemon nitidus var. polyphyllus (Pennell) Cronquist -- accepted -- waxleaf penstemon
  Penstemon nudiflorus A. Gray -- accepted -- Flagstaff beardtongue
  Penstemon nyeensis Crosswh. -- not accepted
  Penstemon oklahomensis Pennell -- accepted -- Oklahoma penstemon, Oklahoma beardtongue
  Penstemon oliganthus Wooton & Standl. -- accepted -- Apache beardtongue
  Penstemon ophianthus Pennell -- accepted -- coiled anther penstemon, Arizona beardtongue
  Penstemon oreocharis Greene -- not accepted
  Penstemon osterhoutii Pennell -- accepted -- Osterhout's beardtongue
  Penstemon ovatus Douglas ex Hook. -- accepted -- eggleaf beardtongue
  Penstemon ovatus var. pinetorum Piper -- not accepted
  Penstemon pachyphyllus A. Gray ex Rydb. -- accepted -- thickleaf penstemon, thickleaf beardtongue
  Penstemon pachyphyllus ssp. congestus (M.E. Jones) D.D. Keck -- not accepted
  Penstemon pachyphyllus var. congestus (M.E. Jones) N.H. Holmgren -- accepted -- thickleaf beardtongue, thickleaf penstemon
  Penstemon pachyphyllus var. mucronatus (N.H. Holmgren) Neese -- not accepted -- mucronate penstemon
  Penstemon pachyphyllus var. pachyphyllus A. Gray ex Rydb. -- accepted -- thickleaf beardtongue
  Penstemon pahutensis N.H. Holmgren -- accepted -- Pahute penstemon, Paiute beardtongue
  Penstemon pallidus Small -- accepted -- pale beardtongue
  Penstemon pallidus ssp. arkansanus (Pennell) R.W. Benn. -- not accepted
  Penstemon palmeri A. Gray -- accepted -- Palmer's penstemon
  Penstemon palmeri ssp. eglandulosus D.D. Keck -- not accepted
  Penstemon palmeri ssp. typicus D.D. Keck -- not accepted
  Penstemon palmeri var. eglandulosus (D.D. Keck) N.H. Holmgren -- accepted -- scented beardtongue, scented penstemon
  Penstemon palmeri var. macranthus (Eastw.) N.H. Holmgren -- accepted -- scented beardtongue, scented penstemon
  Penstemon palmeri var. palmeri A. Gray -- accepted -- Palmer's penstemon
  Penstemon papillatus J.T. Howell -- accepted -- Inyo beardtongue, Inyo penstemon
  Penstemon parryi (A. Gray) A. Gray -- accepted -- Parry's penstemon, Parry's beardtongue
  Penstemon parviflorus Pennell -- not accepted -- Montezuma County beardtongue
  Penstemon parvulus (A. Gray) Krautter -- accepted -- azure penstemon
  Penstemon parvus Pennell -- accepted -- Aquarius Plateau beardtongue, small beardtongue
  Penstemon patens (M.E. Jones) N.H. Holmgren -- accepted -- Lone Pine penstemon, Lone Pine beardtongue
  Penstemon patricus N.H. Holmgren -- not accepted
  Penstemon pauciflorus auct. non Greene -- not accepted
  Penstemon payettensis A. Nelson & J.F. Macbr. -- accepted -- Payette beardtongue
  Penstemon paysoniorum D.D. Keck -- accepted -- Payson's beardtongue, Payson beardtongue
  Penstemon peckii Pennell -- accepted -- Peck's beardtongue
  Penstemon penlandii W.A. Weber -- accepted -- Penland's beardtongue, Penland beardtongue
  Penstemon pennellianus D.D. Keck -- accepted -- Blue Mountain beardtongue
  Penstemon penstemon (L.) Britton -- not accepted
  Penstemon perpulcher A. Nelson -- accepted -- Minidoka beardtongue
  Penstemon personatus D.D. Keck -- accepted -- closethroat beardtongue, closed-lip beardtongue
  Penstemon petiolatus Brandegee -- accepted -- lime penstemon, petiolate beardtongue
  Penstemon pinifolius Greene -- accepted -- pineneedle penstemon, pineneedle beardtongue
  Penstemon pinorum L.M. Shultz & J.S. Shultz -- accepted -- Pine Valley penstemon
  Penstemon platyphyllus Rydb. -- accepted -- broadleaf penstemon, broadleaf beardtongue
  Penstemon pratensis Greene -- accepted -- western whiteflower penstemon, western whiteflower beardtongue
  Penstemon procerus Douglas ex Graham -- accepted -- pincushion beardtongue, littleflower penstemon
  Penstemon procerus ssp. aberrans (M.E. Jones) D.D. Keck -- not accepted
  Penstemon procerus ssp. brachyanthus (Pennell) D.D. Keck -- not accepted
  Penstemon procerus ssp. formosus (A. Nelson) D.D. Keck -- not accepted
  Penstemon procerus ssp. modestus (Greene) D.D. Keck -- not accepted
  Penstemon procerus ssp. tolmiei (Hook.) D.D. Keck -- not accepted
  Penstemon procerus var. aberrans (M.E. Jones) A. Nelson -- accepted -- pincushion beardtongue
  Penstemon procerus var. brachyanthus (Pennell) Cronquist -- accepted -- pincushion beardtongue
  Penstemon procerus var. formosus (A. Nelson) Cronquist -- accepted -- pincushion beardtongue, pincushion penstemon
  Penstemon procerus var. modestus (Greene) N.H. Holmgren -- accepted -- pincushion beardtongue, pincushion penstemon
  Penstemon procerus var. procerus Douglas ex Graham -- accepted -- pincushion beardtongue
  Penstemon procerus var. tolmiei (Hook.) Cronquist -- accepted -- Tolmie's penstemon
  Penstemon pruinosus Douglas ex Lindl. -- accepted -- Chilean beardtongue, Chelan beardtongue
  Penstemon pseudoparvus Crosswh. -- not accepted -- Mt. Washington beardtongue
  Penstemon pseudoputus (Crosswh.) N.H. Holmgren -- accepted -- Kaibab Plateau beardtongue
  Penstemon pseudospectabilis M.E. Jones -- accepted -- desert penstemon
  Penstemon pseudospectabilis ssp. connatifolius (A. Nelson) D.D. Keck -- accepted -- desert penstemon, desert beardtongue
  Penstemon pseudospectabilis ssp. pseudospectabilis M.E. Jones -- accepted -- desert beardtongue, desert penstemon
  Penstemon pseudospectabilis ssp. typicus D.D. Keck -- not accepted
  Penstemon puberulentus Rydb. -- not accepted
  Penstemon pudicus Reveal & Beatley -- accepted -- bashful penstemon, Kawich Range beardtongue
  Penstemon pulchellus Lindl. -- not accepted
  Penstemon pumilus Nutt. -- accepted -- Salmon River beardtongue
  Penstemon purpusii Brandegee -- accepted -- Snow Mountain beardtongue
  Penstemon putus A. Nelson -- accepted -- Black River beardtongue
  Penstemon radicosus A. Nelson -- accepted -- matroot penstemon
  Penstemon ramosus Crosswh. -- not accepted -- lanceleaf beardtongue, lanceleaf penstemon
  Penstemon rattanii A. Gray -- accepted -- Rattan's beardtongue
  Penstemon rattanii ssp. kleei (Greene) D.D. Keck -- not accepted -- Santa Cruz Mountains beardtongue
  Penstemon rattanii ssp. rattanii A. Gray -- not accepted -- Rattan's beardtongue
  Penstemon rattanii var. kleei (Greene) A. Gray -- accepted
  Penstemon rattanii var. minor A. Gray -- not accepted
  Penstemon rattanii var. rattanii A. Gray -- accepted -- beardtongue
  Penstemon retrorsus Payson ex Pennell -- accepted -- Adobe Hills beardtongue
  Penstemon rhizomatosus N.H. Holmgren -- accepted -- Scheel Creek beardtongue
  Penstemon richardsonii Douglas ex Lindl. -- accepted -- cutleaf beardtongue
  Penstemon richardsonii ssp. curtiflorus D.D. Keck -- not accepted
  Penstemon richardsonii ssp. dentatus D.D. Keck -- not accepted
  Penstemon richardsonii var. curtiflorus (D.D. Keck) Cronquist -- accepted -- cutleaf beardtongue
  Penstemon richardsonii var. dentatus (D.D. Keck) Cronquist -- accepted -- cutleaf beardtongue
  Penstemon richardsonii var. richardsonii Douglas ex Lindl. -- accepted -- Richardson's penstemon
  Penstemon roezlii Regel -- accepted -- Roezl's penstemon
  Penstemon rostriflorus Kellogg -- accepted -- Bridges' penstemon, beaked beardtongue, beakflower penstemon
  Penstemon rothrockii A. Gray -- not accepted
  Penstemon rothrockii ssp. jacintensis (Abrams) D.D. Keck -- not accepted
  Penstemon rubicundus D.D. Keck -- accepted -- Wassuck penstemon, Wassuk Range beardtongue
  Penstemon rupicola (Piper) Howell -- accepted -- cliff beardtongue
  Penstemon rydbergii A. Nelson -- accepted -- meadow beardtongue, Rydberg's penstemon
  Penstemon rydbergii ssp. aggregatus (Pennell) D.D. Keck -- not accepted
  Penstemon rydbergii var. aggregatus (Pennell) N.H. Holmgren -- accepted -- meadow beardtongue, meadow penstemon
  Penstemon rydbergii var. oreocharis (Greene) N.H. Holmgren -- accepted -- herbaceous penstemon
  Penstemon rydbergii var. rydbergii A. Nelson -- accepted -- swollen penstemon
  Penstemon rydbergii var. varians (A. Nelson) Cronquist -- not accepted
  Penstemon saxosorum Pennell -- accepted -- upland beardtongue
  Penstemon scapoides D.D. Keck -- accepted -- pinyon beardtongue
  Penstemon scariosus Pennell -- accepted -- White River beardtongue
  Penstemon scariosus var. albifluvis (England) N.H. Holmgren -- accepted -- White River beardtongue
  Penstemon scariosus var. cyanomontanus Neese -- accepted -- Neese's Blue Mountain beardtongue
  Penstemon scariosus var. garrettii (Pennell) N.H. Holmgren -- accepted -- Garrett's beardtongue
  Penstemon scariosus var. scariosus Pennell -- accepted -- White River beardtongue
  Penstemon scouleri Lindl. -- not accepted
  Penstemon secundiflorus Benth. -- accepted -- sidebells penstemon
  Penstemon seorsus (A. Nelson) D.D. Keck -- accepted -- shortlobe penstemon
  Penstemon sepalulus A. Nelson -- accepted -- littlecup beardtongue
  Penstemon serrulatus Menzies ex Rees -- accepted -- serrulate penstemon
  Penstemon shastensis D.D. Keck -- not accepted
  Penstemon smallii A. Heller -- accepted -- Small's beardtongue
  Penstemon spatulatus Pennell -- accepted -- Wallowa beardtongue
  Penstemon speciosus Douglas ex Lindl. -- accepted -- prairie-clover, royal penstemon
  Penstemon speciosus ssp. kennedyi (A. Nelson) D.D. Keck -- not accepted
  Penstemon speciosus ssp. lemhiensis D.D. Keck -- not accepted
  Penstemon speciosus var. speciosus Douglas ex Lindl. -- not accepted
  Penstemon spectabilis Thurb. ex A. Gray -- accepted -- showy penstemon
  Penstemon spectabilis ssp. spectabilis Thurb. ex A. Gray -- not accepted -- showy penstemon
  Penstemon spectabilis ssp. subviscosus D.D. Keck -- not accepted -- showy penstemon
  Penstemon spectabilis var. spectabilis Thurb. ex A. Gray -- accepted -- showy penstemon
  Penstemon spectabilis var. subviscosus (D.D. Keck) McMinn -- accepted -- showy penstemon
  Penstemon spinulosus Wooton & Standl. -- not accepted
  Penstemon stenophyllus A. Gray -- accepted -- Sonoran beardtongue
  Penstemon stephensii Brandegee -- accepted -- Stephens' penstemon, Stephens' beardtongue
  Penstemon strictiformis Rydb. -- accepted -- stiff penstemon, Mancos penstemon
  Penstemon strictus Benth. -- accepted -- Rocky Mountain beardtongue, Rocky Mountain penstemon
  Penstemon strictus ssp. angustus Pennell -- not accepted
  Penstemon strictus ssp. strictiformis (Rydb.) D.D. Keck -- not accepted
  Penstemon subglaber Rydb. -- accepted -- smooth penstemon
  Penstemon subserratus Pennell -- accepted -- finetooth beardtongue
  Penstemon subulatus M.E. Jones -- accepted -- hackberry beardtongue
  Penstemon sudans M.E. Jones -- accepted -- Susanville beardtongue, Susanville penstemon
  Penstemon suffrutescens Rydb. -- not accepted
  Penstemon superbus A. Nelson -- accepted -- superb beardtongue
  Penstemon tenuiflorus Pennell -- accepted -- eastern whiteflower beardtongue
  Penstemon tenuis Small -- accepted -- sharpsepal beardtongue
  Penstemon ternatus Torr. ex A. Gray -- not accepted
  Penstemon ternatus ssp. septentrionalis (Munz & I.M. Johnst.) D.D. Keck -- not accepted
  Penstemon teucrioides Greene -- accepted -- germander beardtongue
  Penstemon thompsoniae (A. Gray) Rydb. -- accepted -- Thompson's penstemon, Thompson's beardtongue
  Penstemon thompsoniae ssp. jaegeri D.D. Keck -- not accepted -- Jaeger's beardtongue, Jaeger's penstemon
  Penstemon thompsoniae ssp. thompsoniae (A. Gray) Rydb. -- not accepted -- Thompson's penstemon, Thompson's beardtongue
  Penstemon thompsoniae var. desperatus Neese -- not accepted
  Penstemon thurberi Torr. -- accepted -- Thurber's penstemon
  Penstemon thurberi var. anestius Reveal & Beatley -- not accepted
  Penstemon tidestromii Pennell -- accepted -- Tidestrom's beardtongue, Tidestrom beardtongue
  Penstemon tiehmii N.H. Holmgren -- accepted -- Tiehm's beardtongue
  Penstemon tolmiei Hook. -- not accepted
  Penstemon tolmiei ssp. brachyanthus (Pennell) D.D. Keck -- not accepted
  Penstemon tolmiei ssp. formosus (A. Nelson) D.D. Keck -- not accepted
  Penstemon torreyi Benth. -- not accepted
  Penstemon tracyi D.D. Keck -- accepted -- Trinity penstemon, Tracy beardtongue
  Penstemon triflorus A. Heller -- accepted -- Heller's beardtongue
  Penstemon triflorus ssp. integrifolius Pennell -- not accepted -- Heller's beardtongue
  Penstemon triflorus ssp. triflorus A. Heller -- not accepted -- Heller's beardtongue
  Penstemon triflorus var. integrifolius (Pennell) Cory -- accepted -- Heller's beardtongue
  Penstemon triflorus var. triflorus A. Heller -- accepted -- Heller's beardtongue
  Penstemon triphyllus Douglas ex Lindl. -- accepted -- Riggin's penstemon
  Penstemon triphyllus ssp. diphyllus (Rydb.) D.D. Keck -- not accepted
  Penstemon tubiflorus Nutt. -- accepted -- white wand beardtongue
  Penstemon tubiflorus var. achoreus Fernald -- not accepted -- white wand beardtongue
  Penstemon tubiflorus var. tubiflorus Nutt. -- not accepted -- white wand beardtongue
  Penstemon tusharensis N.H. Holmgren -- accepted -- Tushar Range beardtongue
  Penstemon uintahensis Pennell -- accepted -- Uinta Mountain beardtongue, Uintah beardtongue
  Penstemon unilateralis Rydb. -- not accepted -- oneside penstemon
  Penstemon utahensis Eastw. -- accepted -- Utah penstemon
  Penstemon variabilis Suksd. -- not accepted
  Penstemon vaseyanus Greene -- not accepted
  Penstemon venosus (D.D. Keck) Reveal -- not accepted
  Penstemon venustus Douglas ex Lindl. -- accepted -- Venus penstemon
  Penstemon versicolor Pennell -- accepted -- variable-color beardtongue
  Penstemon virens Pennell ex Rydb. -- accepted -- Front Range beardtongue
  Penstemon virgatus A. Gray -- accepted -- upright blue beardtongue
  Penstemon virgatus ssp. arizonicus (A. Gray) D.D. Keck -- not accepted
  Penstemon virgatus ssp. asa-grayi Crosswh. -- not accepted
  Penstemon virgatus ssp. pseudoputus Crosswh. -- not accepted
  Penstemon virgatus ssp. putus (A. Nelson) Crosswh. -- not accepted
  Penstemon virgatus var. asa-grayi (Crosswh.) Dorn -- accepted -- upland blue beardtongue
  Penstemon virgatus var. virgatus A. Gray -- accepted -- upright blue beardtongue
  Penstemon wardii A. Gray -- accepted -- Ward's beardtongue, Ward beardtongue
  Penstemon washingtonensis D.D. Keck -- accepted -- Washington beardtongue
  Penstemon watsonii A. Gray -- accepted -- Watson's beardtongue, Watson's penstemon
  Penstemon watsonii ssp. laxus (A. Nelson) D.D. Keck -- not accepted
  Penstemon wherryi Pennell -- not accepted
  Penstemon whippleanus A. Gray -- accepted -- dark beardtongue, Whipple's penstemon
  Penstemon whitedii Piper -- not accepted
  Penstemon whitedii ssp. dayanus (Howell) D.D. Keck -- not accepted
  Penstemon whitedii ssp. tristis Pennell & D.D. Keck -- not accepted
  Penstemon wilcoxii Rydb. -- accepted -- Wilcox's penstemon
  Penstemon wisconsinensis Pennell -- not accepted
  Penstemon wrightii Hook. -- accepted -- Wright's beardtongue
  Penstemon X bryantiae D.D. Keck (pro. hybr.) -- accepted -- Bryant's beardtongue
  Penstemon X crideri A. Nelson (pro. sp.) -- accepted -- Crider's penstemon
  Penstemon X dubius Davidson (pro. sp.) -- accepted -- dubius penstemon
  Penstemon X jonesii Pennell (pro. sp.) -- accepted -- Jones' penstemon
  Penstemon X mirus A. Nelson (pro. sp.) -- accepted -- bush penstemon
  Penstemon X parishii A. Gray (pro. sp.) -- accepted -- Parish's penstemon
  Penstemon X peirsonii Munz & I.M. Johnst. (pro. sp.) -- accepted -- Peirson's penstemon
  Penstemon yampaensis Penland -- accepted -- Yampa beardtongue
  Pentaraphia albiflora Decne. -- not accepted
  Perilla L. -- accepted -- perilla
  Perilla arguta Benth. -- not accepted
  Perilla frutescens (L.) Britton -- accepted -- beefsteak mint, purple mint, beefsteak plant
  Perilla frutescens var. crispa (Benth.) W. Deane -- accepted -- beefsteakplant
  Perilla frutescens var. frutescens (L.) Britton -- accepted -- beefsteakplant
  Perilla ocymoides L. -- not accepted
  Perovskia Kar. -- accepted
  Perovskia atriplicifolia Benth. -- accepted -- Russian sage
  Petitia Jacq. -- accepted
  Petitia domingensis Jacq. -- accepted -- bastard stopper
  Petrea L. -- accepted
  Petrea kohautiana C. Presl -- not accepted
  Petrea volubilis L. -- accepted -- queen's-wreath
  Phaedranthus buccinatorius (DC.) Miers -- not accepted
  Phelipaea erianthera Engelm. ex A. Gray -- not accepted
  Phelipaea pinorum (Geyer ex Hook.) A. Gray -- not accepted
  Phelipaea tuberosa A. Gray -- not accepted
  Phlomis L. -- accepted -- Jerusalem sage
  Phlomis aurea Decne. -- accepted -- Sinai Jerusalem sage
  Phlomis fruticosa L. -- accepted -- shrubby Jerusalem sage
  Phlomis tuberosa L. -- accepted -- tuberous Jerusalem sage
  Phryma L. -- accepted
  Phryma leptostachya L. -- accepted -- lopseed, American lopseed
  Phryma leptostachya var. confertifolia Fernald -- not accepted
  Phryma leptostachya var. leptostachya L. -- accepted -- American lopseed
  Phryma leptostachys L. -- not accepted
  Phrymaceae -- accepted -- phrymas
  Phygelius E. Mey. ex Benth. -- accepted -- Cape-fuchsia
  Phygelius capensis E. Mey. ex Benth. -- accepted -- Cape-fuchsia
  Phyla Lour. -- accepted -- frogfruit, fogfruit
  Phyla canescens (Kunth) Greene -- accepted -- hairy fogfruit, hairy frogfruit, carpet-grass
  Phyla cuneifolia (Torr.) Greene -- accepted -- wedgeleaf fogfruit, fogfruit, wedgeleaf
  Phyla dulcis (Trevir.) Moldenke -- accepted -- Aztec sweetherb, honeyherb, Mexican lippia
  Phyla dulcus (Trevir.) Moldenke -- not accepted -- Mexican lippia, honeyherb, Aztec sweetherb
  Phyla fruticosa (Mill.) K. Kenn. -- accepted -- diamondleaf frogfruit, diamondleaf fogfruit
  Phyla incisa Small -- not accepted
  Phyla lanceolata (Michx.) Greene -- accepted -- lanceleaf frog fruit, northern fogfruit, frog fruit, lanceleaf fogfruit, lanceleaf frogfruit
  Phyla lanceolata var. recognita (Fernald & Griscom) Soper -- not accepted
  Phyla nodiflora (L.) Greene -- accepted -- frog fruit, sawtooth fogfruit, turkey tangle, turkey tangle fogfruit, turkey tangle frogfruit
  Phyla nodiflora var. antillana Moldenke -- not accepted
  Phyla nodiflora var. canescens (Kunth) Moldenke -- not accepted
  Phyla nodiflora var. incisa (Small) Moldenke -- not accepted
  Phyla nodiflora var. longifolia Moldenke -- not accepted
  Phyla nodiflora var. nodiflora (L.) Greene -- not accepted
  Phyla nodiflora var. repens (Spreng.) Moldenke -- not accepted
  Phyla nodiflora var. reptans (Kunth) Moldenke -- not accepted
  Phyla nodiflora var. rosea (D. Don) Moldenke -- not accepted
  Phyla nodiflora var. texensis Moldenke -- not accepted
  Phyla scaberrima (Juss.) Moldenke -- not accepted -- rough fogfruit, rough frogfruit
  Phyla stoechadifolia (L.) Small -- accepted -- southern fogfruit, southern frogfruit
  Phyla strigulosa (M. Martens & Galeotti) Moldenke -- not accepted -- diamondleaf frogfruit, diamondleaf fogfruit
  Phyla strigulosa var. parvifolia (Moldenke) Moldenke -- not accepted
  Phyla strigulosa var. sericea (Kuntze) Moldenke -- not accepted -- fogfruit, diamondleaf fogfruit, diamondleaf frogfruit
  Phyla strigulosa var. strigulosa (M. Martens & Galeotti) Moldenke -- not accepted -- diamondleaf frogfruit, diamondleaf fogfruit
  Phyla X intermedia Moldenke -- accepted -- intermediate fogfruit
  Phyllostegia Benth. -- accepted
  Phyllostegia adenophora H. St. John -- not accepted
  Phyllostegia alba H. St. John -- not accepted
  Phyllostegia ambigua (A. Gray) Hillebr. -- accepted -- mountain phyllostegia
  Phyllostegia bracteata Sherff -- accepted -- bracted phyllostegia
  Phyllostegia brevidens A. Gray -- accepted -- Mauna Kea phyllostegia
  Phyllostegia brevidens var. ambigua A. Gray -- not accepted
  Phyllostegia brevidens var. degeneri Sherff -- not accepted
  Phyllostegia brevidens var. expansa Sherff -- not accepted
  Phyllostegia brevidens var. heterodoxa Sherff -- not accepted
  Phyllostegia brevidens var. hirsutula (Hillebr.) Sherff -- not accepted
  Phyllostegia brevidens var. longipes (Hillebr.) Sherff -- not accepted
  Phyllostegia brevidens var. pauciflora Sherff -- not accepted
  Phyllostegia brevidens var. pubescens Sherff -- not accepted
  Phyllostegia chartacea H. St. John -- not accepted
  Phyllostegia degeneri Sherff -- not accepted
  Phyllostegia electra C.N. Forbes -- accepted -- nehe kuhiwa
  Phyllostegia elliptica H. St. John -- not accepted
  Phyllostegia floribunda Benth. -- accepted -- Hawai'i phyllostegia
  Phyllostegia floribunda var. forbesii Sherff -- not accepted
  Phyllostegia forbesii (Sherff) H. St. John -- not accepted
  Phyllostegia glabra (Gaudich.) Benth. -- accepted -- ulihi phyllostegia
  Phyllostegia glabra var. glabra (Gaudich.) Benth. -- accepted -- ulihi phyllostegia
  Phyllostegia glabra var. lanaiensis Sherff -- accepted -- ulihi phyllostegia
  Phyllostegia glabra var. macraei (Benth.) Sherff -- not accepted
  Phyllostegia grandiflora (Gaudich.) Benth. -- accepted -- kapana
  Phyllostegia haiti H. St. John -- not accepted
  Phyllostegia haliakalae Wawra -- accepted -- Lanai phyllostegia
  Phyllostegia helleri Sherff -- accepted -- Mt. Kahili phyllostegia
  Phyllostegia helleri var. imminuta Sherff -- not accepted
  Phyllostegia hillebrandii H. Mann ex Hillebr. -- accepted -- Hillebrand's phyllostegia
  Phyllostegia hirsuta Benth. -- accepted -- Molokai phyllostegia
  Phyllostegia hirsuta var. laxior O. Deg. & Sherff -- not accepted
  Phyllostegia hispida Hillebr. -- accepted -- hispid phyllostegia
  Phyllostegia imminuta (Sherff) H. St. John -- not accepted -- Lanai phyllostegia
  Phyllostegia kaalaensis H. St. John -- accepted -- Kaala phyllostegia
  Phyllostegia kahiliensis H. St. John -- accepted -- Kahili phyllostegia
  Phyllostegia knudsenii Hillebr. -- accepted -- Waimea phyllostegia
  Phyllostegia konaensis H. St. John -- not accepted
  Phyllostegia lanaiensis (Sherff) H. St. John -- not accepted
  Phyllostegia lantanoides Sherff -- accepted -- Oahu phyllostegia
  Phyllostegia ledyardii H. St. John -- not accepted
  Phyllostegia longimontis H. St. John -- not accepted
  Phyllostegia macrophylla (Gaudich.) Benth. -- accepted -- largeleaf phyllostegia
  Phyllostegia macrophylla var. phytolaccoides Sherff -- not accepted
  Phyllostegia macrophylla var. remyi Sherff -- not accepted
  Phyllostegia macrophylla var. velutina Sherff -- not accepted
  Phyllostegia mannii Sherff -- accepted -- Mann's phyllostegia
  Phyllostegia micrantha H. St. John -- accepted -- St. John's phyllostegia
  Phyllostegia mollis Benth. -- accepted -- Waianae Range phyllostegia
  Phyllostegia mollis var. fagerlindii Sherff -- not accepted
  Phyllostegia mollis var. glabrescens O. Deg. & Sherff -- not accepted
  Phyllostegia mollis var. hochreutineri Sherff -- not accepted -- nehe kuhiwa
  Phyllostegia mollis var. lydgatei Sherff -- not accepted
  Phyllostegia mollis var. micrantha Sherff -- not accepted
  Phyllostegia mollis var. resinosa Fosberg -- not accepted
  Phyllostegia mollis var. skottsbergii Sherff -- not accepted
  Phyllostegia parviflora (Gaudich.) Benth. -- accepted -- smallflower phyllostegia
  Phyllostegia parviflora var. canescens Sherff -- not accepted
  Phyllostegia parviflora var. glabriuscula A. Gray -- accepted -- smallflower phyllostegia
  Phyllostegia parviflora var. honolulensis (Wawra) Sherff -- not accepted
  Phyllostegia parviflora var. lydgatei (Sherff) W.L. Wagner -- accepted
  Phyllostegia parviflora var. major Sherff -- not accepted
  Phyllostegia parviflora var. parviflora (Gaudich.) Benth. -- accepted -- smallflower phyllostegia
  Phyllostegia pilosa H. St. John -- accepted -- pilose phyllostegia
  Phyllostegia polyantha H. St. John -- not accepted
  Phyllostegia racemosa Benth. -- accepted -- kiponapona
  Phyllostegia racemosa var. bryanii Sherff -- not accepted
  Phyllostegia renovans W.L. Wagner -- accepted -- red-leaf phyllostegia
  Phyllostegia rockii Sherff -- accepted -- Rock's phyllostegia
  Phyllostegia stachyoides A. Gray -- accepted -- Maui phyllostegia
  Phyllostegia stachyoides var. hitchcockii Sherff -- not accepted
  Phyllostegia variabilis Bitter -- accepted -- coastal phyllostegia
  Phyllostegia velutina (Sherff) H. St. John -- accepted -- velvet phyllostegia
  Phyllostegia vestita Benth. -- accepted -- streambed phyllostegia
  Phyllostegia villosa H. St. John -- not accepted
  Phyllostegia waimeae Wawra -- accepted -- Kauai phyllostegia
  Phyllostegia warshaueri H. St. John -- accepted -- Laupahoehoe phyllostegia
  Phyllostegia wawrana Sherff -- accepted -- fuzzystem phyllostegia
  Phyllostegia X yamaguchii Hosaka & O. Deg. (pro. sp.) -- accepted -- Yamaguchi's phyllostegia
  Phyllostegia yamaguchi Hosaka & O. Deg. -- not accepted
  Physostegia Benth. -- accepted -- lionsheart
  Physostegia aboriginorum Fernald -- not accepted
  Physostegia angustifolia Fernald -- accepted -- narrowleaf dragonhead, narrowleaf false dragonhead
  Physostegia correllii (Lundell) Shinners -- accepted -- Correll's false dragonhead
  Physostegia denticulata (Aiton) Britton -- not accepted
  Physostegia denticulata sensu Fernald, non (Aiton) Britton -- not accepted
  Physostegia denticulata sensu Small -- not accepted
  Physostegia digitalis Small -- accepted -- finger false dragonhead
  Physostegia edwardsiana Shinners -- not accepted
  Physostegia formosior Lunell -- not accepted
  Physostegia godfreyi P.D. Cantino -- accepted -- Godfrey's false dragonhead
  Physostegia intermedia (Nutt.) Engelm. & A. Gray -- accepted -- intermediate dragonhead, slender false dragonhead
  Physostegia ledinghamii (B. Boivin) P.D. Cantino -- accepted -- Ledingham's false dragonhead
  Physostegia leptophylla Small -- accepted -- slenderleaf false dragonhead
  Physostegia longisepala P.D. Cantino -- accepted -- longsepal false dragonhead
  Physostegia micrantha Lundell -- not accepted
  Physostegia nuttallii (Britton) Fassett -- not accepted
  Physostegia obovata (Elliott) R.K. Godfrey ex Weath. -- not accepted
  Physostegia parviflora Nutt. ex A. Gray -- accepted -- false dragonhead, western false dragonhead
  Physostegia praemorsa Shinners -- not accepted
  Physostegia pulchella Lundell -- accepted -- showy false dragonhead
  Physostegia purpurea (Walter) S.F. Blake -- accepted -- eastern false dragonhead
  Physostegia serotina Shinners -- not accepted
  Physostegia speciosa (Sweet) Sweet -- not accepted
  Physostegia veroniciformis Small -- not accepted
  Physostegia virginiana (L.) Benth. -- accepted -- obedient-plant, obedient plant
  Physostegia virginiana ssp. praemorsa (Shinners) Cantino -- accepted -- obedient plant
  Physostegia virginiana ssp. virginiana (L.) Benth. -- accepted -- obedient-plant, obedient plant
  Physostegia virginiana var. arenaria Shimek -- not accepted
  Physostegia virginiana var. elongata B. Boivin -- not accepted
  Physostegia virginiana var. formosior (Lunell) B. Boivin -- not accepted
  Physostegia virginiana var. granulosa (Fassett) Fernald -- not accepted -- physostégie de Virginie variété granuleuse
  Physostegia virginiana var. ledinghamii B. Boivin -- not accepted
  Physostegia virginiana var. parviflora (Nutt. ex A. Gray) B. Boivin -- not accepted
  Physostegia virginiana var. reducta B. Boivin -- not accepted
  Physostegia virginiana var. speciosa (Sweet) A. Gray -- not accepted
  Piloblephis Raf. -- accepted
  Piloblephis rigida (W. Bartram ex Benth.) Raf. -- accepted -- wild pennyroyal
  Pinguicula L. -- accepted -- butterwort
  Pinguicula caerulea Walter -- accepted -- blueflower butterwort
  Pinguicula ionantha R.K. Godfrey -- accepted -- Godfrey's butterwort, violet butterwort
  Pinguicula lutea Walter -- accepted -- yellow butterwort
  Pinguicula macroceras Link -- not accepted -- California butterwort
  Pinguicula macroceras var. macroceras Link -- not accepted -- California butterwort
  Pinguicula macroceras var. microceras (Cham.) Casper -- not accepted
  Pinguicula planifolia Chapm. -- accepted -- Chapman's butterwort
  Pinguicula primuliflora C.E. Wood & R.K. Godfrey -- accepted -- southern butterwort
  Pinguicula pumila Michx. -- accepted -- small butterwort
  Pinguicula pumila var. buswellii Moldenke -- not accepted
  Pinguicula villosa L. -- accepted -- hairy butterwort
  Pinguicula vulgaris L. -- accepted -- common butterwort
  Pinguicula vulgaris ssp. macroceras (Link) Calder & Roy L. Taylor -- accepted -- California butterwort
  Pinguicula vulgaris ssp. vulgaris L. -- accepted -- common butterwort
  Pinguicula vulgaris var. americana A. Gray -- not accepted
  Pinguicula vulgaris var. macroceras (Link) Herder -- not accepted
  Pithecoctenium Mart. ex Meisn. -- accepted -- monkey's-comb
  Pithecoctenium crucigerum (L.) A.H. Gentry -- accepted -- monkey's-comb
  Plantaginaceae -- accepted -- plantains
  Plantago L. -- accepted -- Indianwheat, plantain
  Plantago altissima auct. non L. -- not accepted
  Plantago arenaria Waldst. & Kit. -- not accepted
  Plantago argyraea E. Morris -- not accepted
  Plantago argyrea E. Morris -- accepted -- saltmeadow plantain
  Plantago aristata Michx. -- accepted -- bottlebrush Indianwheat, largebracted plantain
  Plantago aristata var. nuttallii (Rapin) E. Morris -- not accepted
  Plantago asiatica auct. non L. -- not accepted
  Plantago australis Lam. -- accepted -- Mexican plantain
  Plantago australis ssp. hirtella (Kunth) Rahn -- accepted -- Mexican plantain, Mexican Indianwheat
  Plantago bigelovii A. Gray -- accepted -- coast plantain
  Plantago bigelovii ssp. bigelovii A. Gray -- accepted -- coast plantain
  Plantago bigelovii ssp. californica (Greene) Bassett -- accepted -- coast plantain
  Plantago brunnea E. Morris -- not accepted
  Plantago californica Greene -- not accepted
  Plantago canescens Adams -- accepted -- gray pubescent plantain
  Plantago canescens var. cylindrica (Macoun) B. Boivin -- not accepted
  Plantago cordata Lam. -- accepted -- heartleaf plantain, heart-leaved plantain
  Plantago coronopus L. -- accepted -- buckhorn plantain
  Plantago coronopus ssp. commutata (Guss.) Pilg. -- not accepted
  Plantago debilis R. Br. -- accepted -- weak plantain
  Plantago elongata Pursh -- accepted -- prairie plantain, longleaf plantain, slender plantain
  Plantago elongata ssp. elongata Pursh -- accepted -- prairie plantain
  Plantago elongata ssp. pentasperma Bassett -- accepted -- prairie plantain
  Plantago erecta E. Morris -- accepted -- dotseed plantain
  Plantago erecta ssp. rigidior Pilg. -- not accepted
  Plantago erecta var. erecta E. Morris -- not accepted
  Plantago eriopoda Torr. -- accepted -- alkali plantain, red-woolly plantain, redwood plantain, saline plantain, redwool plantain
  Plantago eriopoda var. tweedyi (A. Gray) B. Boivin -- not accepted
  Plantago fastigiata E. Morris -- not accepted
  Plantago firma Kunze ex Walp. -- accepted -- Chilean plantain
  Plantago glabrifolia (Rock) Pilg. -- not accepted
  Plantago gooddingii A. Nelson & P.B. Kenn. -- not accepted
  Plantago grayana Pilg. -- not accepted
  Plantago grayana var. abrotanelloides Skottsb. -- not accepted
  Plantago halophila E.P. Bicknell -- not accepted
  Plantago hawaiensis (A. Gray) Pilg. -- accepted -- Laukahi kuahiwi, Hawai'i plantain, kuahiwi laukahi
  Plantago hawaiensis var. laxa Pilg. -- not accepted
  Plantago helleri Small -- accepted -- Heller's plantain
  Plantago heterophylla Nutt. -- accepted -- slender plantain
  Plantago hillebrandii Pilg. -- not accepted
  Plantago hirtella Kunth -- not accepted
  Plantago hirtella ssp. galeottiana (Decne.) Thorne -- not accepted
  Plantago hirtella var. galeottiana (Decne.) Pilg. -- not accepted
  Plantago hirtella var. mollior Pilg. -- not accepted
  Plantago hookerana Fisch. & C.A. Mey. -- not accepted
  Plantago hookeriana Fisch. & C.A. Mey. -- accepted -- California plantain
  Plantago hookeriana var. californica (Greene) Poe -- not accepted
  Plantago hookeriana var. nuda (A. Gray) Poe -- not accepted
  Plantago hybrida W.P.C. Barton -- not accepted
  Plantago indica L. -- not accepted
  Plantago insularis Eastw. -- not accepted
  Plantago insularis var. fastigiata (E. Morris) Jeps. -- not accepted
  Plantago insularis var. scariosa (E. Morris) Jeps. -- not accepted
  Plantago juncoides Lam. -- not accepted
  Plantago juncoides var. californica Fernald -- not accepted
  Plantago juncoides var. decipiens (Barneoud) Fernald -- not accepted
  Plantago juncoides var. glauca (Hornem.) Fernald -- not accepted
  Plantago juncoides var. laurentiana Fernald -- not accepted
  Plantago krajinae Pilg. -- not accepted
  Plantago krajinai Pilg. -- not accepted
  Plantago lanceolata L. -- accepted -- buckhorn plantain, English plantain, lanceleaf Indianwheat, lanceleaf plantain, ribgrass, ribwort, narrowleaf plantain
  Plantago lanceolata var. sphaerostachya Mert. & W.D.J. Koch -- not accepted
  Plantago macrocarpa Cham. & Schltdl. -- accepted -- seashore plantain
  Plantago major L. -- accepted -- broadleaf plantain, great plantain, buckhorn plantain, rippleseed plantain, common plantain
  Plantago major ssp. intermedia (DC.) Arcang. -- not accepted
  Plantago major var. asiatica auct. non (L.) Decne. -- not accepted
  Plantago major var. intermedia (DC.) Pilg. -- not accepted -- intermediate plantain
  Plantago major var. major L. -- not accepted -- common plantain
  Plantago major var. pachyphylla Pilg. -- not accepted -- thickleaf plantain
  Plantago major var. pilgeri Domin -- not accepted -- Pilger's plantain
  Plantago major var. scopulorum Fr. & Broberg -- not accepted
  Plantago maritima L. -- accepted -- goose tongue
  Plantago maritima ssp. borealis (Lange) A. Blytt & O.C. Dahl -- not accepted
  Plantago maritima ssp. juncoides (Lam.) Hultén -- not accepted
  Plantago maritima ssp. serpentina (All.) Arcang. -- not accepted
  Plantago maritima var. californica (Fernald) Pilg. -- accepted -- California goose tongue
  Plantago maritima var. juncoides (Lam.) A. Gray -- accepted -- goose tongue
  Plantago maritima var. maritima L. -- accepted
  Plantago media L. -- accepted -- lanceleaf plantain, hoary plantain
  Plantago media var. monnieri (Giraud.) Roug. -- not accepted
  Plantago melanochrous Pilg. -- not accepted
  Plantago minima A. Cunn. -- not accepted
  Plantago muscicola (Rock) Pilg. -- not accepted
  Plantago oliganthos Roem. & Schult. -- not accepted
  Plantago oliganthos var. fallax Fernald -- not accepted
  Plantago ovata Forssk. -- accepted -- desert Indianwheat
  Plantago pachyphylla A. Gray -- accepted -- Maui plantain
  Plantago pachyphylla var. maviensis A. Gray -- not accepted
  Plantago pachyphylla var. rotundifolia Wawra -- not accepted
  Plantago patagonica Jacq. -- accepted -- woolly Indianwheat, woolly plantain
  Plantago patagonica var. aristata (Michx.) A. Gray -- not accepted
  Plantago patagonica var. breviscapa (Shinners) Shinners -- not accepted
  Plantago patagonica var. californica Greene -- not accepted
  Plantago patagonica var. gnaphalioides (Nutt.) A. Gray -- not accepted
  Plantago patagonica var. oblonga (E. Morris) Shinners -- not accepted
  Plantago patagonica var. spinulosa (Decne.) A. Gray -- not accepted
  Plantago picta E. Morris -- not accepted
  Plantago princeps Cham. & Schltdl. -- accepted -- Laukahi kuahiwi, ale, kuahiwi laukahi
  Plantago princeps var. acaulis Wawra -- not accepted
  Plantago princeps var. anomala Rock -- accepted -- ale
  Plantago princeps var. denticulata Hillebr. -- not accepted
  Plantago princeps var. elata Wawra -- not accepted
  Plantago princeps var. hirtella A. Gray -- not accepted
  Plantago princeps var. laxiflora A. Gray -- not accepted -- ale
  Plantago princeps var. longibracteata H. Mann -- accepted -- ale
  Plantago princeps var. princeps Cham. & Schltdl. -- accepted -- ale
  Plantago princeps var. queleniana (Gaudich.) Rock -- not accepted
  Plantago psyllium L. -- accepted -- sand plantain
  Plantago purshii Roem. & Schult. -- not accepted
  Plantago purshii var. argyraea (E. Morris) Poe -- not accepted
  Plantago purshii var. argyrea (E. Morris) Poe -- not accepted
  Plantago purshii var. breviscapa Shinners -- not accepted
  Plantago purshii var. oblonga (E. Morris) Shinners -- not accepted
  Plantago purshii var. picta (E. Morris) Pilg. -- not accepted
  Plantago purshii var. spinulosa (Decne.) Shinners -- not accepted
  Plantago pusilla Nutt. -- accepted -- woolly Indianwheat, woolly plantain, dwarf plantain
  Plantago pusilla var. major Engelm. -- not accepted
  Plantago regelii Decne. -- not accepted
  Plantago rhodosperma Decne. -- accepted -- redseed Indianwheat, redseed plantain
  Plantago rugelii Decne. -- accepted -- blackseed plantain, black-seed plantain, Rugel's plantain
  Plantago rugelii var. asperula Farw. -- accepted -- blackseed plantain
  Plantago rugelii var. rugelii Decne. -- accepted -- blackseed plantain
  Plantago scabra Moench -- not accepted
  Plantago septata E. Morris ex Rydb. -- not accepted
  Plantago shastensis Greene -- not accepted
  Plantago sparsiflora Michx. -- accepted -- pineland plantain
  Plantago spinulosa Decne. -- not accepted
  Plantago subnuda Pilg. -- accepted -- tall coastal plantain
  Plantago truncata Cham. & Schltdl. -- not accepted
  Plantago truncata ssp. firma (Kunze ex Walp.) Pilg. -- not accepted
  Plantago truncata var. truncata Cham. & Schltdl. -- not accepted
  Plantago tweedyi A. Gray -- accepted -- Tweedy's plantain
  Plantago virginica L. -- accepted -- paleseed Indianwheat, Virginia plantain
  Plantago virginica var. viridescens Fernald -- not accepted
  Plantago wrightiana Decne. -- accepted -- Wright's plantain
  Plantago wyomingensis Gand. -- not accepted
  Plectranthus L'Hér. -- accepted -- plectranthus
  Plectranthus amboinicus (Lour.) Spreng. -- accepted -- Mexican mint
  Plectranthus australis R. Br. -- not accepted
  Plectranthus barbatus Andrews -- accepted -- forskohlii
  Plectranthus blumei (Benth.) Launert -- not accepted
  Plectranthus ciliatus E. Mey. -- accepted -- speckled spur flower
  Plectranthus esculentus N.E. Br. -- accepted -- kaffir potato
  Plectranthus nummularius Briq. -- not accepted
  Plectranthus parviflorus Willd. -- accepted -- little spurflower
  Plectranthus scutellarioides (L.) R. Br. -- accepted
  Plectranthus verticillatus (L. f.) Druce -- accepted -- whorled plectranthus
  Pocilla agrestis (L.) Fourr. -- not accepted
  Pocilla biloba (L.) W.A. Weber -- not accepted
  Pocilla persica (Poir.) Fourr. -- not accepted
  Pocilla polita (Fr.) Fourr. -- not accepted
  Podranea Sprague -- accepted
  Podranea ricasoliana (Tanfani) Sprague -- accepted -- Zimbabwe creeper
  Pogogyne Benth. -- accepted -- mesamint
  Pogogyne abramsii J.T. Howell -- accepted -- San Diego pogogyne, San Diego mesamint
  Pogogyne clareana J.T. Howell -- accepted -- Santa Lucia pogogyne, Santa Lucia mint
  Pogogyne douglasii Benth. -- accepted -- Douglas' mesamint
  Pogogyne douglasii ssp. douglasii Benth. -- not accepted -- Douglas' mesamint
  Pogogyne douglasii ssp. minor J.T. Howell -- not accepted -- Douglas' mesamint
  Pogogyne douglasii ssp. parviflora (Benth.) J.T. Howell -- not accepted -- Douglas' mesamint
  Pogogyne floribunda Jokerst -- accepted -- profuseflower mesamint
  Pogogyne nudiuscula A. Gray -- accepted -- Otay Mesa mint
  Pogogyne serpylloides (Torr.) A. Gray -- accepted -- thymeleaf mesamint
  Pogogyne ziziphoroides Benth. -- accepted -- Sacramento mesamint
  Pogostemon Desf. -- accepted
  Pogostemon cablin (Blanco) Benth. -- accepted -- patchouli
  Poliomintha A. Gray -- accepted -- rosemarymint, rosemary mint, rosemary-mint
  Poliomintha glabrescens A. Gray -- accepted -- leafy rosemarymint, rosemary-mint
  Poliomintha incana (Torr.) A. Gray -- accepted -- rosemary mint, hoary rosemarymint, frosted mint
  Poliomintha longiflora A. Gray -- accepted
  Poliomintha longiflora var. congesta R.S. Irving -- accepted
  Poliomintha mollis (Torr.) A. Gray -- not accepted
  Polionintha A. Gray -- not accepted
  Polionintha glabrescens A. Gray -- not accepted
  Polionintha incana (Torr.) A. Gray -- not accepted
  Polionintha longiflora A. Gray -- not accepted
  Polypremum L. -- accepted
  Polypremum procumbens L. -- accepted -- juniper-leaf
  Premna L. -- accepted
  Premna obtusifolia R. Br. -- not accepted
  Premna odorata Blanco -- accepted -- fragrant premna
  Priva Adans. -- accepted
  Priva lappulacea (L.) Pers. -- accepted -- catstongue
  Priva mexicana (L.) Pers. -- accepted -- Mexican priva
  Priva portoricensis Urb. -- accepted -- Puerto Rico velvetburr, Puerto Rico velvet bur
  Proboscidea Schmidel -- accepted -- devilsclaw, unicorn-plant
  Proboscidea althaeifolia (Benth.) Decne. -- accepted -- straighttube devilsclaw, devils claw, devilshorn, desert unicorn-plant
  Proboscidea arenaria (Engelm.) Decne. -- not accepted
  Proboscidea crassibracteata Correll -- not accepted
  Proboscidea fragrans (Lindl.) Decne. -- not accepted
  Proboscidea jussiaei Schmidel -- not accepted
  Proboscidea jussieui Schmidel -- not accepted
  Proboscidea louisiana (Mill.) Wooton & Standl. -- not accepted
  Proboscidea louisianica (Mill.) Thell. -- accepted -- aphid trap, devil's claw, unicorn-plant, common devilsclaw, ram's horn
  Proboscidea louisianica ssp. fragrans (Lindl.) Bretting -- accepted -- aphid trap, devil's claw, unicorn-plant, ram's horn
  Proboscidea louisianica ssp. louisianica (Mill.) Thell. -- accepted -- aphid trap, devil's claw, unicorn-plant, Louisiana ram's horn, ram's horn
  Proboscidea lutea (Lindl.) Stapf -- not accepted
  Proboscidea parviflora (Wooton) Wooton & Standl. -- accepted -- devilsclaw, doubleclaw
  Proboscidea parviflora ssp. gracillima (Hevly) Bretting -- not accepted -- doubleclaw
  Proboscidea parviflora ssp. parviflora (Wooton) Wooton & Standl. -- accepted -- doubleclaw, devil's claw, unicorn plant
  Proboscidea parviflora ssp. sinaloensis (Van Eselt.) Bretting -- accepted -- doubleclaw
  Proboscidea parviflora var. hohokamiana Bretting -- accepted
  Proboscidea parviflora var. parviflora (Wooton) Wooton & Standl. -- accepted -- doubleclaw
  Proboscidea sabulosa Correll -- accepted -- dune unicorn plant, sanddune unicorn-plant
  Proboscidea spicata Correll -- accepted -- many-flowered unincorn plant, New Mexico unicorn-plant
  Prunella L. -- accepted -- selfheal
  Prunella caroliniana Mill. -- not accepted
  Prunella laciniata (L.) L. -- accepted -- cutleaf selfheal
  Prunella vulgaris L. -- accepted -- heal all, healall, selfheal, common selfheal
  Prunella vulgaris ssp. aleutica (Fernald) Hultén -- accepted -- Aleutian selfheal
  Prunella vulgaris ssp. lanceolata (W. Bartram) Hultén -- accepted -- lance selfheal
  Prunella vulgaris ssp. vulgaris L. -- accepted -- common selfheal
  Prunella vulgaris var. aleutica Fernald -- not accepted
  Prunella vulgaris var. atropurpurea Fernald -- not accepted
  Prunella vulgaris var. calvescens Fernald -- not accepted
  Prunella vulgaris var. elongata Benth. -- not accepted
  Prunella vulgaris var. hispida Benth. -- not accepted
  Prunella vulgaris var. lanceolata (W. Bartram) Fernald -- not accepted
  Prunella vulgaris var. minor Sm. -- not accepted
  Prunella vulgaris var. nana Clute -- not accepted
  Prunella vulgaris var. parviflora (Poir.) DC. -- not accepted
  Prunella vulgaris var. rouleauiana Vict. -- not accepted
  Prunella vulgaris var. vulgaris L. -- not accepted -- self-heal
  Pseuderanthemum Radlk. -- accepted
  Pseuderanthemum carruthersii (Seem.) Guillaumin -- accepted -- Carruthers' falseface
  Pseuderanthemum carruthersii var. atropurpureum Fosberg -- not accepted
  Pseuderanthemum carruthersii var. carruthersii (Seem.) Guillaumin -- not accepted
  Pseuderanthemum fasciculatum auct. non (Oerst.) Leonard -- not accepted -- falseface
  Pseuderanthemum praecox (Benth.) Leonard -- accepted -- night and afternoon
  Pseuderanthemum variabile (R. Br.) Radlk. -- accepted -- night and afternoon
  Pseudocalymma A. Samp. & Kuhlm. -- not accepted
  Pseudocalymma alliaceum (Lam.) Sandwith -- not accepted
  Pseudocalymma macrocarpum (Donn. Sm.) Sandwith -- not accepted
  Pseudocalymma sagotii (Bureau & K. Schum.) Sandwith -- not accepted
  Pseudolysimachion (W.D.J. Koch) Opiz -- accepted
  Pseudolysimachion longifolium (L.) Opiz -- not accepted -- longleaf speedwell
  Pseudolysimachion spicatum (L.) Opiz -- not accepted
  Pseudolysimachion spurium (L.) Rauschert -- accepted -- bastard speedwell
  Pseudorontium (A. Gray) Rothm. -- accepted
  Pseudorontium cyathiferum (Benth.) Rothm. -- accepted -- dog's-mouth
  Pycnanthemum Michx. -- accepted -- mountainmint
  Pycnanthemum albescens Torr. & A. Gray -- accepted -- whiteleaf mountainmint
  Pycnanthemum aristatum Michx. -- not accepted
  Pycnanthemum beadlei (Small) Fernald -- accepted -- Beadle's mountainmint
  Pycnanthemum californicum Torr. ex T. Durand -- accepted -- Sierra mint
  Pycnanthemum clinopodioides Torr. & A. Gray -- accepted -- basil mountainmint
  Pycnanthemum curvipes (Greene) E. Grant & Epling -- accepted -- stone mountainmint, Stone Mountain mountainmint
  Pycnanthemum flexuosum auct. non (Walter) Britton, Sterns & Poggenb. -- not accepted -- Appalachian mountainmint
  Pycnanthemum flexuosum (Walter) Britton, Sterns & Poggenb. -- accepted -- Appalachian mountainmint
  Pycnanthemum floridanum E. Grant & Epling -- accepted -- Florida mountainmint
  Pycnanthemum hyssopifolium Benth. -- not accepted
  Pycnanthemum incanum (L.) Michx. -- accepted -- hoary mountainmint
  Pycnanthemum incanum var. incanum (L.) Michx. -- accepted -- hoary mountainmint
  Pycnanthemum incanum var. loomisii (Nutt.) Fernald -- not accepted
  Pycnanthemum incanum var. puberulum (E. Grant & Epling) Fernald -- accepted -- hoary mountainmint
  Pycnanthemum leptodon A. Gray -- not accepted
  Pycnanthemum loomisii Nutt. -- accepted -- Loomis' mountainmint
  Pycnanthemum monotrichum Fernald -- accepted -- onehair mountainmint
  Pycnanthemum montanum Michx. -- accepted -- thinleaf mountainmint
  Pycnanthemum muticum (Michx.) Pers. -- accepted -- clustered mountainmint
  Pycnanthemum nudum Nutt. -- accepted -- coastalplain mountainmint, coastal plain mountainmint
  Pycnanthemum pilosum Nutt. -- accepted -- whorled mountainmint
  Pycnanthemum puberulum E. Grant & Epling -- not accepted
  Pycnanthemum pycnanthemoides (Leavenw.) Fernald -- accepted -- southern mountainmint
  Pycnanthemum pycnanthemoides var. pycnanthemoides (Leavenw.) Fernald -- accepted -- southern mountainmint
  Pycnanthemum pycnanthemoides var. viridifolium Fernald -- accepted -- southern mountainmint
  Pycnanthemum setosum Nutt. -- accepted -- awned mountainmint
  Pycnanthemum tenuifolium Schrad. -- accepted -- narrowleaf mountainmint
  Pycnanthemum torrei Benth. -- accepted -- Torrey's mountainmint
  Pycnanthemum torrei var. leptodon (A. Gray) Boomhour -- not accepted
  Pycnanthemum tullium Benth. -- not accepted
  Pycnanthemum umbratile Fernald -- not accepted
  Pycnanthemum verticillatum (Michx.) Pers. -- accepted -- whorled mountainmint
  Pycnanthemum verticillatum var. pilosum (Nutt.) Cooperr. -- not accepted -- whorled mountainmint
  Pycnanthemum verticillatum var. verticillatum (Michx.) Pers. -- not accepted -- whorled mountainmint
  Pycnanthemum virginianum (L.) Rob. & Fernald -- accepted -- Virginia mountain-mint, Virginia mountainmint
  Pycnanthemum virginianum var. verticillatum (Michx.) B. Boivin -- not accepted
  Pycnanthemum viridifolium (Fernald) E. Grant & Epling -- not accepted
  Pycnothymus Small -- not accepted
  Pycnothymus rigidus (W. Bartram ex Benth.) Small -- not accepted
  Pyrostegia C. Presl -- accepted
  Pyrostegia ignea (Vell.) C. Presl -- not accepted
  Pyrostegia venusta (Ker Gawl.) Miers -- accepted -- flamevine
  Rhinanthus L. -- accepted -- yellow rattle, rattleweed
  Rhinanthus alectorolophus (Scop.) Pollich -- not accepted -- European yellowrattle
  Rhinanthus arcticus (Sterneck) Pennell -- not accepted
  Rhinanthus borealis (Sterneck) Chabert -- not accepted
  Rhinanthus borealis ssp. kyrollae (Chabert) Pennell -- not accepted
  Rhinanthus crista-galli L. -- not accepted
  Rhinanthus crista-galli var. fallax (Wimm. & Grab.) Druce -- not accepted
  Rhinanthus groenlandicus Chabert -- not accepted
  Rhinanthus kyrollae Chabert -- not accepted
  Rhinanthus major L. -- accepted -- European yellow rattle
  Rhinanthus minor L. -- accepted -- little yellow-rattle, little yellowrattle, little yellow rattle
  Rhinanthus minor ssp. borealis (Sterneck) Á. Löve -- not accepted
  Rhinanthus minor ssp. groenlandicus (Chabert) Neuman -- accepted -- arctic rattlebox
  Rhinanthus minor ssp. minor L. -- accepted -- cockscomb rhinanthus, little yellowrattle, little yellow rattle
  Rhinanthus rigidus Chabert -- not accepted
  Rhinanthus serotinus (Schönh. ex Halacsy & H. Braun) Oborny -- accepted -- late-flowering yellowrattle, late-flowering yellow rattle
  Rhinanthus stenophyllus (Schur) Schinz & Thell. -- not accepted
  Rhododon Epling -- accepted -- rhododon, sandmint
  Rhododon angulatus (Tharp) B.L. Turner -- not accepted -- angled sandmint
  Rhododon ciliatus (Benth.) Epling -- accepted -- Texas sandmint
  Rhytidophyllum Mart. -- accepted -- tibey-amarillo
  Rhytidophyllum auriculatum Hook. -- accepted -- tibey-amarillo
  Rhytiglossa androsaemifolia Nees -- not accepted
  Rhytiglossa verticillaris Nees -- not accepted
  Rhytiglossa viridiflora Nees -- not accepted
  Roseodendron Miranda -- accepted
  Roseodendron donnell-smithii (Rose) Miranda -- accepted -- primavera
  Rosmarinus L. -- accepted -- rosemary
  Rosmarinus officinalis L. -- accepted -- rosemary, romero
  Rosmarinus officinalis var. prostratus hort. -- not accepted
  Ruellia L. -- accepted -- wild petunia
  Ruellia alopecuroidea Vahl -- not accepted
  Ruellia antipoda L. -- not accepted
  Ruellia blechum L. -- accepted -- Browne's blechum
  Ruellia brasiliensis Spreng. -- not accepted
  Ruellia brevifolia (Pohl) C. Ezcurra -- accepted -- tropical wild petunia
  Ruellia brittoniana Leonard -- not accepted -- softseed wild petunia, Britton's wild petunia
  Ruellia caroliniensis (J.F. Gmel.) Steud. -- accepted -- Carolina wild petunia
  Ruellia caroliniensis ssp. caroliniensis (J.F. Gmel.) Steud. -- not accepted -- Carolina wild petunia
  Ruellia caroliniensis ssp. caroliniensis var. caroliniensis (J.F. Gmel.) Steud. -- not accepted -- Carolina wild petunia
  Ruellia caroliniensis ssp. caroliniensis var. serrulata Tharp & F.A. Barkley -- not accepted -- Carolina wild petunia
  Ruellia caroliniensis ssp. caroliniensis var. succulenta (Small) R.W. Long -- not accepted -- Carolina wild petunia
  Ruellia caroliniensis ssp. ciliosa (Pursh) R.W. Long -- not accepted -- Carolina wild petunia
  Ruellia caroliniensis ssp. ciliosa var. cinerascens (Fernald) Kartesz & Gandhi -- not accepted -- Carolina wild petunia
  Ruellia caroliniensis ssp. ciliosa var. heteromorpha (Fernald) R.W. Long -- not accepted -- Carolina wild petunia
  Ruellia caroliniensis var. caroliniensis (J.F. Gmel.) Steud. -- accepted -- Carolina wild petunia
  Ruellia caroliniensis var. cheloniformis Fernald -- not accepted
  Ruellia caroliniensis var. cinerascens (Fernald) Kartesz & Gandhi -- not accepted -- Carolina wild petunia
  Ruellia caroliniensis var. dentata (Nees) Fernald -- not accepted
  Ruellia caroliniensis var. heteromorpha (Fernald) R.W. Long -- not accepted -- Carolina wild petunia
  Ruellia caroliniensis var. membranacea Fernald -- not accepted
  Ruellia caroliniensis var. nanella Fernald -- not accepted
  Ruellia caroliniensis var. parviflora (Nees) S.F. Blake -- not accepted
  Ruellia caroliniensis var. salicina Fernald -- not accepted
  Ruellia caroliniensis var. semicalva Fernald -- not accepted
  Ruellia caroliniensis var. serrulata Tharp & F.A. Barkley -- accepted -- Carolina wild petunia
  Ruellia caroliniensis var. succulenta (Small) R.W. Long -- not accepted -- Carolina wild petunia
  Ruellia chartacea (T. Anderson) Wassh. -- accepted -- Peruvian wild petunia
  Ruellia ciliatiflora Hook. -- accepted -- hairyflower wild petunia
  Ruellia ciliosa Pursh -- accepted -- Sandhills wild petunia
  Ruellia ciliosa var. cinerascens Fernald -- not accepted
  Ruellia ciliosa var. longiflora A. Gray -- not accepted
  Ruellia coccinea (L.) Vahl -- accepted -- yerba maravilla
  Ruellia coerulea Morong -- not accepted -- softseed wild petunia, Britton's wild petunia
  Ruellia corzoi Tharp & F.A. Barkley -- accepted -- Corzo's wild petunia
  Ruellia davisiorum Tharp & F.A. Barkley -- accepted -- Rio Grande wild petunia
  Ruellia devosiana hort. Jacob-Makoy ex E. Morren -- accepted -- Brazilian wild petunia
  Ruellia dipteracanthus Hemsl. -- accepted
  Ruellia drummondiana (Nees) A. Gray -- accepted -- Drummond's wild petunia
  Ruellia drushelii Tharp & F.A. Barkley -- accepted -- Drushel's wild petunia
  Ruellia drushelii var. drushelii Tharp & F.A. Barkley -- accepted -- Drushel's wild petunia
  Ruellia drushelii var. macrocarpa Tharp & F.A. Barkley -- accepted -- Drushel's wild petunia
  Ruellia dulcis Cav. -- not accepted
  Ruellia fulgida Andrews -- accepted
  Ruellia graecizans Backer -- not accepted
  Ruellia heteromorpha Fernald -- accepted -- Carolina wild petunia
  Ruellia humilis sensu Small, non Nutt. -- not accepted -- fringeleaf wild petunia
  Ruellia humilis Nutt. -- accepted -- fringeleaf wild petunia, wild petunia, low ruellia
  Ruellia humilis var. calvescens Fernald -- not accepted
  Ruellia humilis var. depauperata Tharp & F.A. Barkley -- not accepted
  Ruellia humilis var. expansa Fernald -- not accepted
  Ruellia humilis var. frondosa Fernald -- not accepted
  Ruellia humilis var. humilis Nutt. -- not accepted -- fringeleaf wild petunia
  Ruellia humilis var. longiflora (A. Gray) Fernald -- not accepted
  Ruellia humistrata Michx. -- not accepted
  Ruellia hybrida Pursh -- not accepted
  Ruellia hybrida sensu Small, non Pursh -- not accepted
  Ruellia lacustris Schltdl. & Cham. -- not accepted
  Ruellia lorentziana Griseb. -- not accepted
  Ruellia malacosperma sensu Small, non Greenm. -- not accepted -- softseed wild petunia
  Ruellia malacosperma Greenm. -- not accepted -- softseed wild petunia, Britton's wild petunia
  Ruellia metzae Tharp -- accepted -- Metz's wild petunia
  Ruellia metzae var. marshii Tharp & F.A. Barkley -- not accepted
  Ruellia metziae Tharp -- not accepted -- Metz's wild petunia
  Ruellia metziae var. marshii Tharp & F.A. Barkley -- not accepted
  Ruellia muelleri Tharp & F.A. Barkley -- not accepted
  Ruellia noctiflora (Nees) A. Gray -- accepted -- nightflowering wild petunia
  Ruellia nudiflora (Engelm. & A. Gray) Urb. -- accepted -- wild petunia, violet wild petunia
  Ruellia nudiflora var. glabrata Leonard -- not accepted
  Ruellia nudiflora var. hispidula Shinners -- not accepted
  Ruellia nudiflora var. humilis (Nees) Leonard -- not accepted
  Ruellia nudiflora var. nudiflora (Engelm. & A. Gray) Urb. -- accepted -- violet wild petunia
  Ruellia nudiflora var. occidentalis (A. Gray) Leonard -- not accepted
  Ruellia nudiflora var. runyonii (Tharp & F.A. Barkley) B.L. Turner -- accepted -- Runyon's wild petunia
  Ruellia nudiflora var. yucatana Leonard -- not accepted
  Ruellia oblongifolia Michx. -- not accepted
  Ruellia occidentalis (A. Gray) Tharp & F.A. Barkley -- accepted -- western wild petunia
  Ruellia parryi A. Gray -- accepted -- Parry's wild petunia
  Ruellia parviflora (Nees) Britton -- not accepted
  Ruellia patula Jacq. -- accepted
  Ruellia pedunculata Torr. ex A. Gray -- accepted -- stalked wild petunia
  Ruellia pedunculata ssp. pedunculata Torr. ex A. Gray -- accepted -- stalked wild petunia
  Ruellia pedunculata ssp. pinetorum (Fernald) R.W. Long -- not accepted -- stalked wild petunia
  Ruellia pinetorum Fernald -- accepted -- stalked wild petunia
  Ruellia prostrata Poir. -- accepted -- prostrate wild petunia
  Ruellia purshiana Fernald -- accepted -- Pursh's wild petunia
  Ruellia reptans G. Forst. -- not accepted
  Ruellia runyonii Tharp & F.A. Barkley -- not accepted
  Ruellia runyonii var. berlandieri Tharp & F.A. Barkley -- not accepted
  Ruellia runyonii var. runyonii Tharp & F.A. Barkley -- not accepted -- Runyon's wild petunia
  Ruellia simplex C. Wright -- accepted -- softseed wild petunia, Britton's wild petunia
  Ruellia strepens L. -- accepted -- limestone wild petunia
  Ruellia strepens var. cleistantha A. Gray -- not accepted
  Ruellia strepens var. micrantha (Engelm. & A. Gray) Britton -- not accepted
  Ruellia strictopaniculata Tharp & F.A. Barkley -- not accepted
  Ruellia succulenta Small -- accepted -- Carolina wild petunia
  Ruellia tuberosa sensu A. Gray -- not accepted -- minnieroot
  Ruellia tuberosa L. -- accepted -- minnieroot
  Ruellia tuberosa var. occidentalis A. Gray -- not accepted
  Ruellia tweediana auct. non Griseb. -- not accepted -- Britton's wild petunia, Mexican petunia
  Ruellia yucatana (Leonard) Tharp & F.A. Barkley -- accepted -- violet ruellia, Yucatan wild petunia
  Russelia Jacq. -- accepted
  Russelia equisetiformis Schltdl. & Cham. -- accepted -- fountainbush
  Russelia juncea Zucc. -- not accepted
  Rytidophyllum Mart. -- not accepted
  Rytidophyllum auriculatum Hook. -- not accepted -- tibey amarillo
  Saintpaulia H. Wendl. -- accepted -- African violet
  Sairocarpus D.A. Sutton -- accepted -- snapdragon
  Sairocarpus breweri (A. Gray) D.A. Sutton -- accepted -- Brewer's snapdragon
  Sairocarpus cornutus (Benth.) D.A. Sutton -- accepted -- spurred snapdragon
  Sairocarpus coulterianus (Benth. ex A. DC.) D.A. Sutton -- accepted -- Coulter's snapdragon
  Sairocarpus elmeri (Rothm.) D.A. Sutton -- accepted -- Elmer's snapdragon
  Sairocarpus kingii (S. Watson) D.A. Sutton -- accepted -- least snapdragon, least toad's-mouth, King's snapdragon
  Sairocarpus multiflorus (Pennell) D.A. Sutton -- accepted -- Sierra snapdragon
  Sairocarpus nuttallianus (Benth. ex A. DC.) D.A. Sutton -- accepted -- violet snapdragon, violet toad's-mouth
  Sairocarpus pusillus (Brandegee) D.A. Sutton -- accepted -- lesser snapdragon
  Sairocarpus subcordatus (A. Gray) D.A. Sutton -- accepted -- dimorphic snapdragon
  Sairocarpus vexillocalyculatus (Kellogg) D.A. Sutton -- accepted -- wiry snapdragon
  Sairocarpus virga (A. Gray) D.A. Sutton -- accepted -- tall snapdragon
  Sairocarpus watsonii (Vasey & Rose) D.A. Sutton -- accepted -- Watson's snapdragon
  Salazaria Torr. -- accepted -- bladdersage
  Salazaria mexicana Torr. -- accepted -- bladdersage, Mexican bladdersage
  Salvia L. -- accepted -- sage
  Salvia aethiopis L. -- accepted -- African sage, Mediterranean sage
  Salvia amissa Epling -- accepted -- Santa Catalina sage, Santa Catalina Mountain sage, Aravaipa sage
  Salvia apiana Jeps. -- accepted -- white sage
  Salvia apiana var. apiana Jeps. -- accepted -- white sage
  Salvia apiana var. compacta Munz -- accepted -- compact white sage
  Salvia argentea L. -- accepted -- silver sage
  Salvia arizonica A. Gray -- accepted -- Arizona sage, desert indigo sage
  Salvia aurea L. -- accepted
  Salvia azurea Michx. ex Lam. -- accepted -- blue sage, azure blue sage
  Salvia azurea ssp. intermedia Epling -- not accepted
  Salvia azurea ssp. pitcheri (Torr. ex Benth.) Epling -- not accepted
  Salvia azurea var. azurea Michx. ex Lam. -- accepted -- azure blue sage
  Salvia azurea var. grandiflora Benth. -- accepted -- blue sage, Pitcher's sage
  Salvia ballotiflora Benth. -- accepted -- shrubby blue sage
  Salvia ballotiflora var. pinguifolia Fernald -- not accepted
  Salvia blodgettii Chapm. -- not accepted -- Blodgett's sage
  Salvia brandegeei Munz -- accepted -- Santa Rosa Island sage
  Salvia broussonetii Benth. -- accepted
  Salvia carduacea Benth. -- accepted -- thistle sage
  Salvia carnosa Douglas ex Greene -- not accepted
  Salvia carnosa ssp. argentea (Rydb.) Epling -- not accepted
  Salvia carnosa ssp. gilmanii Epling -- not accepted
  Salvia carnosa ssp. mearnsii (Britton) Epling -- not accepted
  Salvia carnosa ssp. pilosa (A. Gray) Epling -- not accepted
  Salvia carnosa var. argentea (Rydb.) McMinn -- not accepted
  Salvia carnosa var. gilmanii (Epling) L.D. Benson -- not accepted
  Salvia carnosa var. gracilior M. Peck -- not accepted
  Salvia chapmanii A. Gray -- accepted -- Chapman's sage
  Salvia chia Fernald -- not accepted
  Salvia cleistogama de Bary & Paul -- not accepted
  Salvia clevelandii (A. Gray) Greene -- accepted -- fragrant sage
  Salvia coccinea Buc'hoz ex Etl. -- accepted -- blood sage
  Salvia columbariae Benth. -- accepted -- chia
  Salvia columbariae var. argillacea S.L. Welsh & N.D. Atwood -- accepted
  Salvia columbariae var. columbariae Benth. -- accepted -- California sage, chia
  Salvia columbariae var. ziegleri Munz -- accepted -- Ziegler's sage, Ziegler's chia
  Salvia davidsonii Greenm. -- not accepted -- Davidson's sage
  Salvia disjuncta Fernald -- accepted -- southern Mexican sage
  Salvia divinorum Epling & Játiva -- accepted -- yerba de la pastora
  Salvia dolichantha (Cory) Whitehouse -- not accepted -- clustered sage
  Salvia dominica L. -- accepted
  Salvia dorrii (Kellogg) Abrams -- accepted -- grayball sage, purple sage
  Salvia dorrii ssp. argentea (Rydb.) Munz -- not accepted
  Salvia dorrii ssp. carnosa (Douglas ex Greene) Abrams -- not accepted
  Salvia dorrii ssp. dorrii (Kellogg) Abrams -- accepted -- Dorr's sage, purple sage
  Salvia dorrii ssp. dorrii var. clokeyi Strachan -- not accepted -- purple sage, Clokey's sage
  Salvia dorrii ssp. dorrii var. dorrii (Kellogg) Abrams -- not accepted
  Salvia dorrii ssp. dorrii var. incana (Benth.) Strachan -- not accepted -- purple sage
  Salvia dorrii ssp. dorrii var. pilosa (A. Gray) Strachan & Reveal -- not accepted -- purple sage, grayball sage
  Salvia dorrii ssp. gilmanii (Epling) Abrams -- not accepted
  Salvia dorrii ssp. mearnsii (Britton) E.M. McClint. -- accepted -- Mearn sage, purple sage, Verde Valley sage
  Salvia dorrii var. carnosa (Douglas ex Greene) Cronquist -- not accepted
  Salvia dorrii var. clokeyi Strachan -- accepted -- purple sage
  Salvia dorrii var. dorrii (Kellogg) Abrams -- accepted -- purple sage, Dorr's sage
  Salvia dorrii var. incana (Benth.) Strachan -- accepted -- purple sage
  Salvia dorrii var. pilosa (A. Gray) Strachan & Reveal -- accepted -- purple sage
  Salvia earlei Wooton & Standl. -- not accepted
  Salvia eigii Zohary -- accepted
  Salvia elegans Vahl -- accepted -- pineapple sage
  Salvia engelmannii A. Gray -- accepted -- Engelmann's sage
  Salvia eremostachya Jeps. -- accepted -- rose sage
  Salvia farinacea Benth. -- accepted -- mealycup sage
  Salvia farinacea var. farinacea Benth. -- not accepted -- mealycup sage
  Salvia farinacea var. latifolia Shinners -- not accepted -- mealycup sage
  Salvia fruticosa Mill. -- accepted -- Greek oregano, Greek sage, three-lobe sage, salvia de jardín
  Salvia funerea M.E. Jones -- accepted -- Death Valley sage, woolly sage
  Salvia glutinosa L. -- accepted -- sticky sage
  Salvia grahamii Benth. -- not accepted
  Salvia greatae Brandegee -- not accepted -- lavender sage
  Salvia greatai Brandegee -- accepted -- Orocopia sage, lavender sage
  Salvia greggii A. Gray -- accepted -- autumn sage
  Salvia henryi A. Gray -- accepted -- crimson sage
  Salvia hierosolymitana Boiss. -- accepted -- Jerusalem salvia
  Salvia hispanica L. -- accepted -- chia
  Salvia indica L. -- accepted
  Salvia judaica Boiss. -- accepted
  Salvia jurisicii Kosanin -- accepted
  Salvia lanceaefolia Poir. -- not accepted
  Salvia lancifolia Poir. -- not accepted
  Salvia lanigera Poir. -- accepted
  Salvia lemmonii A. Gray -- accepted -- red sage, Lemmon's sage
  Salvia leptophylla Benth. -- accepted -- slenderleaf sage
  Salvia leucantha Cav. -- accepted -- Mexican bush sage
  Salvia leucophylla Greene -- accepted -- San Luis purple sage
  Salvia longistyla Benth. -- accepted -- Mexican sage
  Salvia lycioides A. Gray -- accepted -- canyon sage
  Salvia lyrata L. -- accepted -- lyreleaf sage
  Salvia mellifera Greene -- accepted -- black sage
  Salvia mellifera ssp. jonesii (Munz) Abrams -- not accepted
  Salvia mellifera ssp. revoluta (Brandegee) Abrams -- not accepted
  Salvia micrantha Vahl -- accepted -- Yucatan sage
  Salvia micrantha var. blodgettii (Chapm.) Epling -- accepted -- Blodgett's sage
  Salvia micrantha var. micrantha Vahl -- accepted -- Yucatan sage
  Salvia microphylla Kunth. -- accepted -- baby sage
  Salvia microphylla var. wislizeni A. Gray -- not accepted
  Salvia microstegia Boiss. & Balansa -- accepted
  Salvia miniata Fernald -- accepted -- Belize sage
  Salvia misella Kunth -- accepted -- tropical sage, Florida Keys sage
  Salvia mohavensis Greene -- accepted -- Mojave sage
  Salvia munzii Epling -- accepted -- Munz's sage
  Salvia nemorosa L. -- not accepted -- woodland sage
  Salvia nutans L. -- accepted -- nodding sage
  Salvia occidentalis Sw. -- accepted -- West Indian sage
  Salvia officinalis L. -- accepted -- kitchen sage
  Salvia pachyphylla Epling ex Munz -- accepted -- rose sage, blue sage
  Salvia pachyphylla ssp. eremopictus R.M. Taylor -- accepted -- Arizona rose sage, blue sage
  Salvia pachyphylla ssp. pachyphylla Epling ex Munz -- accepted -- blue sage, rose sage
  Salvia palaestina Benth. -- accepted
  Salvia pallida Benth. -- accepted -- pale sage
  Salvia parryi A. Gray -- accepted -- Parry's sage
  Salvia patens Cav. -- accepted -- sage
  Salvia penstemonoides Kunth & Bouché -- accepted -- big red sage
  Salvia pentstemonoides Kunth & Bouché -- not accepted
  Salvia pinguifolia (Fernald) Wooton & Standl. -- accepted -- rock sage
  Salvia pinnata L. -- accepted
  Salvia pitcheri Torr. ex Benth. -- not accepted
  Salvia potus Epling -- accepted -- chia
  Salvia pratensis L. -- accepted -- introduced sage
  Salvia privoides Benth. -- not accepted
  Salvia ramosissima Fernald -- not accepted
  Salvia reflexa Hornem. -- accepted -- lance-leaf sage, blue sage, lambsleaf sage, Rocky Mountain sage, sage mint, lanceleaf sage
  Salvia regla Cav. -- accepted -- mountain sage
  Salvia riparia Kunth -- not accepted -- Florida Keys sage
  Salvia roemeriana Scheele -- accepted -- cedar sage
  Salvia samuelssonii Rech. f. -- accepted
  Salvia sclarea L. -- accepted -- salvia romana, clary, clary sage, Europe sage
  Salvia sclarea var. turkestaniana Mottet -- not accepted
  Salvia serotina L. -- accepted -- littlewoman
  Salvia setosa Fernald -- accepted
  Salvia sonomensis Greene -- accepted -- creeping sage
  Salvia spathacea Greene -- accepted -- hummingbird sage
  Salvia spinosa L. -- accepted
  Salvia splendens Sellow ex Roem. & Schult. -- accepted -- scarlet sage
  Salvia subincisa Benth. -- accepted -- saw-tooth sage, sawtooth sage
  Salvia summa A. Nelson -- accepted -- great sage
  Salvia sylvestris L. -- accepted -- woodland sage
  Salvia syriaca L. -- accepted
  Salvia texana (Scheele) Torr. -- accepted -- Texas sage
  Salvia thomasiana Urb. -- accepted -- Thomas' sage
  Salvia tiliifolia Vahl -- accepted -- linden-leaf sage, lindenleaf sage
  Salvia urticifolia L. -- accepted -- nettleleaf sage
  Salvia vaseyi (Porter) Parish -- accepted -- scallopleaf sage
  Salvia verbenaca L. -- accepted -- wild sage, wild clary, vervain sage
  Salvia verbenacea L. -- not accepted
  Salvia verticillata L. -- accepted -- lilac sage
  Salvia vinacea Wooton & Standl. -- accepted -- largeflower sage
  Salvia virgata auct. non Jacq. -- not accepted -- meadow sage
  Salvia virgata Jacq. -- accepted -- wand sage
  Salvia viridis L. -- accepted -- wild clary, annual clary, bluebeard
  Salvia whitehousei Alziar -- accepted -- clustered sage
  Salvia X bernardina Parish ex Greene (pro. sp.) -- accepted -- Bernard's sage
  Salvia X palmeri (A. Gray) Greene (pro. sp.) -- accepted -- Palmer's sage
  Salvia X superba Stapf -- accepted
  Salvia X sylvestris L. (pro sp.) -- not accepted -- woodland sage
  Sanchezia Ruiz & Pav. -- accepted
  Sanchezia nobilis Hook. f. -- not accepted
  Sanchezia speciosa Leonard -- accepted -- shrubby whitevein
  Saritaea Dugand -- accepted -- glowvine
  Saritaea magnifica (W. Bull) Dugand -- accepted -- glowvine
  Sarmienta Ruiz & Pav. -- accepted
  Sarmienta repens Ruiz & Pav. -- not accepted
  Satureja L. -- accepted -- savory
  Satureja acinos (L.) Scheele -- not accepted
  Satureja arkansana (Nutt.) Briq. -- not accepted
  Satureja ascendens (Jord.) K. Malý -- not accepted
  Satureja ashei Weath. -- not accepted
  Satureja brownei (Sw.) Briq. -- not accepted
  Satureja brownii (Sw.) Briq. -- not accepted
  Satureja brownii var. pilosiuscula (A. Gray) Briq. -- not accepted
  Satureja calamintha (L.) Scheele -- not accepted
  Satureja calamintha ssp. ascendens (Jord.) Briq. -- not accepted
  Satureja calamintha var. glandulosa (Req.) Briq. -- not accepted
  Satureja calamintha var. nepeta (L.) Briq. -- not accepted
  Satureja calamintha var. nepetoides (Jord.) Briq. -- not accepted
  Satureja caroliniana auct. non (Michx.) Briq. -- not accepted
  Satureja chamissonis (Benth.) Briq. -- not accepted
  Satureja chandleri (Brandegee) Druce -- not accepted
  Satureja coccinea (Nutt. ex Hook.) Bertol. -- not accepted
  Satureja dentata (Chapm.) Briq. -- not accepted
  Satureja douglasii (Benth.) Briq. -- not accepted -- yerba buena
  Satureja georgiana (R.M. Harper) H.E. Ahles -- not accepted
  Satureja glabella (Michx.) Briq. -- not accepted
  Satureja glabella var. angustifolia (Torr.) Svenson -- not accepted
  Satureja glabra (Nutt.) Fernald -- not accepted
  Satureja hortensis L. -- accepted -- summer savory
  Satureja mimuloides (Benth.) Briq. -- not accepted -- monkeyflower savory
  Satureja montana L. -- accepted -- winter savory
  Satureja nepeta (L.) Scheele -- not accepted
  Satureja rigida W. Bartram ex Benth. -- not accepted
  Satureja sylvatica (Bromf.) K. Malý -- not accepted
  Satureja sylvatica ssp. ascendens (Jord.) Roy L. Taylor & MacBryde -- not accepted
  Satureja viminea L. -- not accepted -- serpentine savory
  Satureja vulgaris (L.) Fritsch -- not accepted
  Satureja vulgaris var. diminuta (Simon) Fernald & Wiegand -- not accepted
  Satureja vulgaris var. neogaea Fernald -- not accepted
  Schaueria linearifolia Torr. -- not accepted
  Schaueria parvifolia Torr. -- not accepted
  Schistophragma Benth. ex Endl. -- accepted
  Schistophragma intermedia (A. Gray) Pennell -- not accepted -- harlequin spiralseed
  Schlegelia Miq. -- accepted
  Schlegelia brachyantha Griseb. -- accepted -- higuerito de sierra
  Schlegelia portoricensis (Urb.) Britton -- not accepted
  Schwalbea L. -- accepted
  Schwalbea americana L. -- accepted -- American chaffseed, chaffseed
  Schwalbea americana var. australis (Pennell) Reveal & C.R. Broome -- not accepted
  Schwalbea australis Pennell -- not accepted
  Scoparia L. -- accepted -- licorice weed
  Scoparia dulcis L. -- accepted -- licorice weed
  Scoparia flava Cham. & Schltdl. -- accepted -- yellow licorice weed
  Scoparia montevidensis (Spreng.) R.E. Fries -- accepted -- broomwort
  Scoparia montevidensis var. glandulifera (Fritsch) R.E. Fries -- accepted -- broomwort
  Scrophularia L. -- accepted -- figwort
  Scrophularia aquatica L. -- not accepted
  Scrophularia atrata Pennell -- accepted -- darkflowered figwort, black-flowered figwort
  Scrophularia auriculata L. -- accepted -- shoreline figwort
  Scrophularia californica Cham. & Schltdl. -- accepted -- California figwort
  Scrophularia californica ssp. californica Cham. & Schltdl. -- not accepted -- California figwort
  Scrophularia californica ssp. floribunda (Greene) R.J. Shaw -- not accepted -- California figwort
  Scrophularia californica var. desertorum Munz -- not accepted
  Scrophularia californica var. floribunda Greene -- not accepted
  Scrophularia californica var. laciniata Jeps. -- not accepted
  Scrophularia californica var. oregana (Pennell) B. Boivin -- not accepted
  Scrophularia canina L. -- accepted -- dog figwort
  Scrophularia canina ssp. canina L. -- accepted -- dog figwort
  Scrophularia canina ssp. hoppii (Koch) Fourn. -- accepted -- Hopp's figwort
  Scrophularia coccinea A. Gray -- not accepted
  Scrophularia davidsonii Pennell -- not accepted
  Scrophularia desertorum (Munz) R.J. Shaw -- accepted -- desert figwort, mountain figwort
  Scrophularia floribunda (Greene) A. Heller -- not accepted
  Scrophularia glabrata Davidson -- not accepted
  Scrophularia hoppii Koch -- not accepted
  Scrophularia laevis Wooton & Standl. -- accepted -- Organ Mountain figwort
  Scrophularia lanceolata Pursh -- accepted -- lanceleaf figwort
  Scrophularia leporella E.P. Bicknell -- not accepted
  Scrophularia macrantha Greene ex Stiefelh. -- accepted -- New Mexico figwort
  Scrophularia marilandica L. -- accepted -- carpenter's square, Maryland figwort
  Scrophularia minutiflora Pennell -- accepted -- littleflower figwort
  Scrophularia montana Wooton -- accepted -- Montana figwort, mountain figwort
  Scrophularia multiflora Pennell -- not accepted
  Scrophularia neomexicana R.J. Shaw -- not accepted
  Scrophularia nodosa L. -- accepted -- woodland figwort
  Scrophularia nodosa var. californica (Cham. & Schltdl.) M.E. Jones -- not accepted
  Scrophularia occidentalis (Rydb.) E.P. Bicknell -- not accepted
  Scrophularia oregana Pennell -- not accepted -- Oregon figwort
  Scrophularia parviflora Wooton & Standl. -- accepted -- pineland figwort
  Scrophularia pectinata Raf. -- not accepted
  Scrophularia peregrina L. -- accepted -- Mediterranean figwort
  Scrophularia umbrosa Dumort. -- accepted -- water figwort
  Scrophularia villosa Pennell -- accepted -- Santa Catalina figwort
  Scrophulariaceae -- accepted -- figworts, scrofulaires
  Scutellaria L. -- accepted -- Huachuca skullcap, skullcap
  Scutellaria alabamensis Alexander -- accepted -- Alabama skullcap
  Scutellaria altamaha Small -- accepted -- pineland skullcap
  Scutellaria altamaha ssp. australis Epling -- not accepted
  Scutellaria altissima L. -- accepted -- tall skullcap
  Scutellaria ambigua Nutt. -- not accepted
  Scutellaria angustifolia Pursh -- accepted -- narrowleaf skullcap
  Scutellaria angustifolia ssp. angustifolia Pursh -- accepted -- narrowleaf skullcap
  Scutellaria angustifolia ssp. micrantha Olmstead -- accepted -- narrowleaf skullcap
  Scutellaria angustifolia var. canescens A. Gray -- not accepted
  Scutellaria antirrhinoides Benth. -- accepted -- nose skullcap
  Scutellaria arenicola Small -- accepted -- Florida scrub skullcap
  Scutellaria arguta Buckley -- accepted -- Blue Ridge skullcap
  Scutellaria austiniae Eastw. -- not accepted
  Scutellaria australis (Fassett) Epling -- not accepted
  Scutellaria bolanderi A. Gray -- accepted -- Sierra skullcap
  Scutellaria bolanderi ssp. austromontana Epling -- accepted -- Sierra skullcap
  Scutellaria bolanderi ssp. bolanderi A. Gray -- accepted -- Sierra skullcap
  Scutellaria brevifolia A. Gray -- not accepted
  Scutellaria brittoni Porter -- not accepted
  Scutellaria brittonii Porter -- accepted -- Britton's skullcap
  Scutellaria bushii Britton -- accepted -- Bush's skullcap
  Scutellaria californica A. Gray -- accepted -- California skullcap
  Scutellaria cardiophylla Engelm. & A. Gray -- accepted -- gulf skullcap
  Scutellaria coerulea Moc. & Sessé ex Benth. -- not accepted -- blue skullcap
  Scutellaria cordifolia Muhl. -- not accepted
  Scutellaria cuthbertii Alexander -- not accepted
  Scutellaria drummondii Benth. -- accepted -- Drummond's skullcap
  Scutellaria drummondii var. drummondii Benth. -- accepted -- Drummond's skullcap
  Scutellaria drummondii var. edwardsiana B.L. Turner -- accepted -- Drummond's skullcap
  Scutellaria drummondii var. runyonii B.L. Turner -- accepted -- Drummond's skullcap
  Scutellaria elliptica Muhl. ex Spreng. -- accepted -- hairy skullcap
  Scutellaria elliptica var. elliptica Muhl. ex Spreng. -- accepted -- hairy skullcap
  Scutellaria elliptica var. hirsuta (Short & Peter) Fernald -- accepted -- hairy skullcap
  Scutellaria epilobiifolia A. Ham. -- not accepted
  Scutellaria floridana Chapm. -- accepted -- Florida skullcap
  Scutellaria galericulata L. -- accepted -- hooded skullcap, marsh skullcap
  Scutellaria galericulata ssp. pubescens (Benth.) Á. Löve & D. Löve -- not accepted
  Scutellaria galericulata var. epilobiifolia (A. Ham.) Jordal -- not accepted
  Scutellaria galericulata var. pubescens Benth. -- not accepted
  Scutellaria glabriuscula Fernald -- accepted -- Georgia skullcap
  Scutellaria havanensis Jacq. -- accepted -- Havana skullcap
  Scutellaria helleri Small -- not accepted
  Scutellaria holmgreniorum Cronquist -- not accepted -- Ravendale skullcap
  Scutellaria incana Biehler -- accepted -- hoary skullcap
  Scutellaria incana ssp. hispida (Benth.) Epling -- not accepted
  Scutellaria incana var. australis (Epling) Collins -- not accepted -- hoary skullcap
  Scutellaria incana var. incana Biehler -- accepted -- hoary skullcap
  Scutellaria incana var. punctata (Chapm.) C. Mohr -- accepted -- hoary skullcap
  Scutellaria integrifolia L. -- accepted -- helmet flower
  Scutellaria integrifolia var. hispida Benth. -- not accepted
  Scutellaria integrifolia var. multiglandulosa Kearney -- not accepted
  Scutellaria laevis Shinners -- accepted -- smooth-stem skullcap, Culberson County skullcap
  Scutellaria lateriflora L. -- accepted -- mad dog skullcap, blue skullcap
  Scutellaria lateriflora var. lateriflora L. -- accepted -- blue skullcap
  Scutellaria leonardii Epling -- not accepted
  Scutellaria mellichampii Small -- accepted -- hoary skullcap
  Scutellaria microphylla Moc. & Sessé ex Benth. -- accepted -- littleleaf skullcap
  Scutellaria minor auct. non Huds. -- not accepted -- lesser skullcap
  Scutellaria montana Chapm. -- accepted -- large-flowered skullcap, largeflower skullcap
  Scutellaria multiglandulosa (Kearney) Small ex Harper -- accepted -- Small's skullcap
  Scutellaria muriculata Epling -- accepted -- Rio Grande skullcap
  Scutellaria nana A. Gray -- accepted -- dwarf skullcap
  Scutellaria nana var. sapphirina Barneby -- not accepted
  Scutellaria nervosa Pursh -- accepted -- veiny skullcap
  Scutellaria nervosa var. ambigua (Nutt.) Fernald -- not accepted
  Scutellaria nervosa var. calvifolia Fernald -- not accepted
  Scutellaria ocmulgee Small -- accepted -- Ocmulgee skullcap
  Scutellaria ovalifolia Pers. -- not accepted
  Scutellaria ovalifolia ssp. hirsuta (Short & Peter) Epling -- not accepted
  Scutellaria ovalifolia ssp. mollis Epling -- not accepted
  Scutellaria ovata Hill -- accepted -- eggleaf skullcap, heartleaf skullcap
  Scutellaria ovata ssp. bracteata (Benth.) Epling -- accepted -- heartleaf skullcap
  Scutellaria ovata ssp. calcarea Epling -- not accepted
  Scutellaria ovata ssp. cuthbertii (Alexander) Epling -- accepted -- Cuthbert's skullcap
  Scutellaria ovata ssp. mexicana Epling -- accepted -- Mexican skullcap, heartleaf skullcap
  Scutellaria ovata ssp. mississippiensis (Mart.) Epling -- not accepted
  Scutellaria ovata ssp. ovata Hill -- accepted -- heartleaf skullcap
  Scutellaria ovata ssp. pseudoarguta Epling -- accepted -- heartleaf skullcap, heart-leaved skullcap
  Scutellaria ovata ssp. pseudovenosa Epling -- not accepted
  Scutellaria ovata ssp. rugosa (Alph. Wood) Epling -- accepted -- heartleaf skullcap
  Scutellaria ovata ssp. rupestris Epling -- accepted -- heartleaf skullcap
  Scutellaria ovata ssp. venosa Epling -- accepted -- heartleaf skullcap
  Scutellaria ovata ssp. versicolor (Nutt.) Epling -- not accepted
  Scutellaria ovata ssp. virginiana Epling -- accepted -- Virginia skullcap
  Scutellaria ovata var. bracteata Benth. -- not accepted
  Scutellaria ovata var. calcarea (Epling) Gleason -- not accepted
  Scutellaria ovata var. pseudoarguta (Epling) Core -- not accepted
  Scutellaria ovata var. rugosa (Alph. Wood) Fernald -- not accepted
  Scutellaria ovata var. versicolor (Nutt.) Fernald -- not accepted
  Scutellaria ovata var. virginiana (Epling) Core -- not accepted
  Scutellaria parvula Michx. -- accepted -- small skullcap
  Scutellaria parvula var. australis Fassett -- accepted -- small skullcap
  Scutellaria parvula var. leonardii (Epling) Fernald -- not accepted -- Leonard's skullcap
  Scutellaria parvula var. missouriensis (Torr.) Goodman & C.A. Lawson -- accepted -- Leonard's skullcap
  Scutellaria parvula var. parvula Michx. -- accepted -- small skullcap
  Scutellaria pilosa Michx. -- not accepted
  Scutellaria platyphylla (Epling) B.L. Turner & Delprete -- not accepted
  Scutellaria potosina Brandegee -- accepted -- Mexican skullcap
  Scutellaria potosina ssp. parviflora Epling -- not accepted
  Scutellaria potosina ssp. platyphylla Epling -- accepted -- Mexican skullcap
  Scutellaria potosina ssp. platyphylla var. platyphylla (Epling) B.L. Turner -- not accepted
  Scutellaria potosina ssp. potosina Brandegee -- accepted -- Mexican skullcap
  Scutellaria potosina ssp. potosina var. davisiana B.L. Turner -- not accepted
  Scutellaria potosina ssp. potosina var. tessellata (Epling) B.L. Turner -- not accepted -- Huachuca Mountain skullcap
  Scutellaria potosina var. davisiana B.L. Turner -- accepted -- Mexican skullcap
  Scutellaria potosina var. grahamiana B.L. Turner -- accepted -- Mexican skullcap
  Scutellaria potosina var. grahmiana B.L. Turner -- not accepted
  Scutellaria potosina var. platyphylla (Epling) B.L. Turner -- accepted -- Mexican skullcap
  Scutellaria potosina var. tessellata (Epling) B.L. Turner -- accepted -- Mexican skullcap
  Scutellaria pseudoserrata Epling -- accepted -- falseteeth skullcap
  Scutellaria punctata (Chapm.) Leonard -- not accepted
  Scutellaria racemosa Pers. -- accepted -- South American skullcap
  Scutellaria resinosa Torr. -- accepted -- sticky skullcap
  Scutellaria resinosa var. brevifolia (A. Gray) Penland -- not accepted
  Scutellaria sapphirina (Barneby) Olmstead -- accepted -- White Pine skullcap
  Scutellaria saxatilis Riddell -- accepted -- smooth rock skullcap
  Scutellaria saxatilis var. pilosior Benth. -- not accepted
  Scutellaria serrata Andrews -- accepted -- showy skullcap
  Scutellaria serrata var. montana (Chapm.) Penland -- not accepted
  Scutellaria siphocampyloides Vatke -- accepted -- grayleaf skullcap
  Scutellaria siphocamyploides Vatke -- not accepted
  Scutellaria tessellata Epling -- not accepted
  Scutellaria texana B.L. Turner -- accepted -- Texas skullcap
  Scutellaria thieretii Shinners -- accepted -- Thieret's skullcap
  Scutellaria tuberosa Benth. -- accepted -- Danny's skullcap
  Scutellaria tuberosa ssp. australis (Jeps.) Epling -- not accepted
  Scutellaria tuberosa ssp. similis (Jeps.) Epling -- not accepted
  Scutellaria tuberosa var. similis Jeps. -- not accepted
  Scutellaria tuberosa var. tuberosa Benth. -- not accepted
  Scutellaria veronicifolia Rydb. -- not accepted
  Scutellaria wrightii A. Gray -- accepted -- resin-dot skullcap, resinous skullcap, Skullcap, Wright's skullcap
  Scutellaria wrightii auct. non A. Gray -- not accepted
  Scutellaria X churchilliana Fernald (pro. sp.) -- accepted -- Churchill's skullcap
  Sesamum L. -- accepted -- sesame
  Sesamum alatum Thonn. -- accepted
  Sesamum indicum L. -- accepted -- sesame
  Sesamum orientale L. -- not accepted -- sesame
  Sesamum radiatum Schumach. -- accepted -- sesamum
  Setiscapella cleistogama (A. Gray) Barnhart -- not accepted
  Setiscapella pusilla (Vahl) Barnhart -- not accepted
  Setiscapella subulata (L.) Barnhart -- not accepted
  Seymeria Pursh -- accepted -- blacksenna, black senna
  Seymeria bipinnatisecta Seem. -- accepted -- Eagle Pass black-senna, Eagle Pass blacksenna
  Seymeria cassioides (J.F. Gmel.) S.F. Blake -- accepted -- yaupon blacksenna
  Seymeria havardii (Pennell) Standl. -- not accepted
  Seymeria macrophylla Nutt. -- not accepted
  Seymeria pectinata Pursh -- accepted -- piedmont blacksenna
  Seymeria pectinata ssp. pectinata Pursh -- accepted -- piedmont blacksenna
  Seymeria pectinata ssp. peninsularis (Pennell) Pennell -- accepted -- piedmont blacksenna
  Seymeria scabra A. Gray -- accepted -- limpia blacksenna
  Seymeria texana (A. Gray) Pennell -- accepted -- Texas blacksenna
  Sideritis L. -- accepted -- ironwort
  Sideritis lanata L. -- accepted -- hairy ironwort
  Sideritis montana L. -- accepted -- mountain ironwort
  Sideritis romana L. -- accepted -- simplebeak ironwort
  Sinningia Nees -- accepted
  Sinningia speciosa (Lodd.) Hiern -- accepted -- Brazilian gloxinia
  Siphonanthus indicus L. -- not accepted
  Siphonoglossa Oerst. -- accepted -- tubetongue, tube tongue
  Siphonoglossa dipteracantha (Nees) A. Heller -- not accepted
  Siphonoglossa greggii Greenm. & C.H. Thomps. -- not accepted -- Gregg's tubetongue
  Siphonoglossa longiflora (Torr.) A. Gray -- not accepted -- longflower tubetongue
  Siphonoglossa pilosella (Nees) Torr. -- not accepted -- hairy tubetongue
  Siphonoglossa sessilis (Jacq.) D.N. Gibson -- accepted -- tropical tubetongue, tropical tube tongue
  Siphonosmanthus delavayi (Franch.) Stapf -- not accepted
  Solenostemon Thonn. -- not accepted
  Solenostemon rotundifolius (Poir.) J.K. Morton -- not accepted -- hausa potato
  Solenostemon scutellarioides (L.) Codd -- not accepted -- common coleus
  Sophronanthe hispida Benth. ex Lindl. -- not accepted
  Sophronanthe pilosa (Michx.) Small -- not accepted
  Sopubia Buch.-Ham. ex D.Don -- accepted
  Sopubia mannii Skan -- accepted
  Spathodea P. Beauv. -- accepted
  Spathodea campanulata P. Beauv. -- accepted -- fireball, fountain tree, rarningobchey, tulipier du Gabon, African tuliptree
  Spathodea obovata Kunth -- not accepted
  Stachydeoma Small -- accepted -- mock pennyroyal
  Stachydeoma angulata Tharp -- not accepted
  Stachydeoma graveolens (Chapm. ex A. Gray) Small -- accepted -- mock pennyroyal
  Stachys L. -- accepted -- hedge nettle, hedgenettle
  Stachys affinis Bunge -- not accepted -- artichoke betony
  Stachys agraria auct. non Cham. & Schltdl. -- not accepted
  Stachys ajugoides Benth. -- accepted -- bugle hedgenettle
  Stachys ajugoides var. ajugoides Benth. -- not accepted -- hedge nettle
  Stachys ajugoides var. rigida Jeps. & Hoover -- not accepted
  Stachys albens A. Gray -- accepted -- white hedgenettle, whitestem hedgenettle
  Stachys ambigua (A. Gray) Britton -- not accepted
  Stachys annua (L.) L. -- accepted -- annual hedgenettle
  Stachys arenicola Britton -- not accepted
  Stachys arvensis (L.) L. -- accepted -- staggerweed
  Stachys aspera Michx. -- accepted -- hyssopleaf hedgenettle
  Stachys asperrima Rydb. -- not accepted
  Stachys atlantica Britton -- not accepted
  Stachys bergii G.A. Mulligan & D.B. Munro -- accepted -- His Excellency's supreme reflection, Berg's hedgenettle
  Stachys bigelovii A. Gray -- accepted -- rock hedgenettle
  Stachys borealis Rydb. -- not accepted
  Stachys bullata Benth. -- accepted -- California hedgenettle
  Stachys byzantina K. Koch -- accepted -- woolly hedgenettle
  Stachys chamissonis Benth. -- accepted -- coastal hedgenettle
  Stachys chamissonis var. chamissonis Benth. -- accepted -- coastal hedgenettle
  Stachys chamissonis var. cooleyae (A. Heller) G.A. Mulligan & D.B. Munro -- accepted -- coastal hedgenettle
  Stachys ciliata Epling -- not accepted
  Stachys ciliata Douglas ex Benth. -- not accepted
  Stachys clingmanii Small -- accepted -- Clingman's hedgenettle
  Stachys coccinea Ortega -- accepted -- betony, scarlet hedgenettle
  Stachys cooleyae A. Heller -- not accepted
  Stachys cordata Riddell -- accepted -- heartleaf hedgenettle
  Stachys crenata Raf. -- accepted -- mouse's-ear, mousesear
  Stachys cretica L. -- accepted -- Cretan hedgenettle
  Stachys drummondii Benth. -- accepted -- Drummond's hedgenettle
  Stachys emersonii Piper -- not accepted
  Stachys eplingii J.B. Nelson -- accepted -- Epling's hedgenettle
  Stachys floridana Shuttlw. ex Benth. -- accepted -- Florida betony, Florida hedgenettle
  Stachys germanica L. -- accepted -- German hedgenettle
  Stachys germanica var. italica (Mill.) Briq. -- not accepted
  Stachys glabra Riddell -- not accepted
  Stachys grandiflora (Stephan ex Willd.) Benth. -- not accepted -- big-sage
  Stachys grayana House -- not accepted
  Stachys hirta L. -- not accepted
  Stachys hispida Pursh -- accepted -- hispid hedgenettle
  Stachys homotricha (Fernald) Rydb. -- not accepted
  Stachys hyssopifolia Michx. -- accepted -- hyssopleaf hedgenettle
  Stachys hyssopifolia var. ambigua A. Gray -- not accepted -- hyssopleaf hedgenettle
  Stachys hyssopifolia var. hyssopifolia Michx. -- not accepted -- hyssopleaf hedgenettle
  Stachys hyssopifolia var. lythroides (Small) J.B. Nelson -- not accepted -- hyssopleaf hedgenettle, Tallahassee hedge-nettle
  Stachys iltisii J.B. Nelson -- accepted
  Stachys italica Mill. -- not accepted
  Stachys latidens Small ex Britton -- accepted -- broadtooth hedgenettle
  Stachys longispicata Boiss. -- accepted -- longspike hedgenettle
  Stachys lythroides Small -- not accepted
  Stachys macrantha (K. Koch) Stearn -- accepted -- big-sage
  Stachys mexicana Benth. -- accepted -- Mexican hedgenettle
  Stachys nuttallii Shuttlw. ex Benth. -- not accepted -- heartleaf hedgenettle
  Stachys ocymastrum (L.) Briq. -- accepted -- hedgenettle, Italian hedgenettle
  Stachys officinalis (L.) Trevis. -- accepted -- common hedgenettle
  Stachys olympica Poir. -- not accepted
  Stachys palustris L. -- accepted -- marsh hedgenettle
  Stachys palustris ssp. arenicola (Britton) Gill -- not accepted -- marsh hedgenettle
  Stachys palustris ssp. palustris L. -- not accepted -- woundwort
  Stachys palustris ssp. pilosa (Nutt.) Epling -- not accepted -- marsh hedgenettle
  Stachys palustris var. elliptica Clos -- not accepted
  Stachys palustris var. hispida (Pursh) B. Boivin -- not accepted
  Stachys palustris var. homotricha Fernald -- not accepted
  Stachys palustris var. macrocalyx Jenn. -- not accepted
  Stachys palustris var. nipigonensis Jenn. -- not accepted
  Stachys palustris var. petiolata Clos -- not accepted
  Stachys palustris var. phaneropoda Weath. -- not accepted
  Stachys palustris var. pilosa (Nutt.) Fernald -- not accepted
  Stachys palustris var. puberula Jenn. -- not accepted
  Stachys palustris var. segetum (Mutel) Grognier -- not accepted
  Stachys pilosa Nutt. -- accepted -- hairy hedgenettle
  Stachys pilosa var. arenicola (Britton) G.A. Mulligan & D.B. Munro -- accepted -- hairy hedgenettle
  Stachys pilosa var. pilosa Nutt. -- accepted -- hairy hedgenettle
  Stachys pycnantha Benth. -- accepted -- shortspike hedgenettle
  Stachys recta L. -- accepted -- seaport hedgenettle, stiff hedgenettle
  Stachys riddellii House -- not accepted
  Stachys rigida Nutt. ex Benth. -- accepted -- rigid hedgenettle, rough hedgenettle
  Stachys rigida ssp. lanata Epling -- not accepted
  Stachys rigida ssp. quercetorum (A. Heller) Epling -- not accepted
  Stachys rigida ssp. rivularis (A. Heller) Epling -- not accepted
  Stachys rigida var. quercetorum (A. Heller) G.A. Mulligan & D.B. Munro -- accepted -- rough hedgenettle
  Stachys rigida var. rigida Nutt. ex Benth. -- accepted -- rough hedgenettle
  Stachys rothrockii A. Gray -- accepted -- Rothrock's hedge-nettle, Rothrock's hedgenettle
  Stachys salvioides Small -- not accepted
  Stachys scopulorum Greene -- not accepted
  Stachys sieboldii Miq. -- accepted -- artichoke betony
  Stachys sieboldii var. sieboldii Miq. -- accepted -- artichoke betony
  Stachys stebbinsii G.A. Mulligan & D.B. Munro -- accepted -- Stebbins' hedgenettle
  Stachys stricta Greene -- accepted -- Sonoma hedgenettle
  Stachys subcordata Rydb. -- not accepted
  Stachys sylvatica L. -- accepted -- whitespot
  Stachys tenuifolia Willd. -- accepted -- slender betony, smooth hedge-nettle, smooth hedgenettle
  Stachys tenuifolia var. aspera (Michx.) Fernald -- not accepted
  Stachys tenuifolia var. hispida (Pursh) Fernald -- not accepted
  Stachys tenuifolia var. latidens (Small ex Britton) J.B. Nelson -- not accepted -- smooth hedgenettle
  Stachys tenuifolia var. perlonga Fernald -- not accepted -- smooth hedgenettle
  Stachys tenuifolia var. platyphylla Fernald -- not accepted
  Stachys tenuifolia var. tenuifolia Willd. -- not accepted -- smooth hedgenettle
  Stachys teucriifolia Rydb. -- not accepted
  Stachys teucriiformis Rydb. -- not accepted
  Stachys tuberifera Naudin -- not accepted
  Stachytarpheta Vahl -- accepted -- porterweed
  Stachytarpheta australis Moldenke -- not accepted -- branched porterweed
  Stachytarpheta cayennensis (Rich.) Vahl -- accepted -- Cayenne porterweed, blue snakeweed, bluetop, Cayenne snakeweed, rattail, rough-leaf false vervain, snakeweed
  Stachytarpheta dichotoma (Ruiz & Pav.) Vahl -- not accepted -- branched porterweed
  Stachytarpheta indica Vahl -- not accepted
  Stachytarpheta jamaicensis (L.) Vahl -- accepted -- light-blue snakeweed
  Stachytarpheta mutabilis (Jacq.) Vahl -- accepted -- changeable velvetberry
  Stachytarpheta speciosa Pohl ex Schauer -- accepted -- Brazilian porterweed
  Stachytarpheta strigosa Vahl -- accepted -- West Indian porterweed
  Stachytarpheta urticifolia (Salisb.) Sims -- accepted -- nettleleaf velvetberry
  Stachytarpheta X gracilis Danser -- accepted
  Stachytarpheta X hybrida Moldenke -- accepted -- hybrid porterweed
  Stachytarpheta X intercedens Danser -- accepted -- porterweed
  Stachytarpheta X trimeni Rech. -- not accepted -- porterweed
  Stemodia L. -- accepted -- twintip
  Stemodia arizonica Pennell -- not accepted
  Stemodia durantifolia (L.) Sw. -- accepted -- white-woolly twintip, whitewoolly twintip
  Stemodia lanata Ruiz & Pav. ex Benth. -- accepted -- gray-woolly twintip, Stemodia lanata
  Stemodia maritima L. -- accepted -- seaside twintip
  Stemodia schottii Holz. -- accepted -- Rio Grande twintip
  Stemodia tomentosa (Mill.) Greenm. & C.H. Thomps. -- not accepted
  Stemodia verticillata (Mill.) Hassl. -- accepted -- whorled twintip
  Stenandrium Nees -- accepted -- shaggytuft
  Stenandrium barbatum Torr. & A. Gray -- accepted -- early shaggytuft
  Stenandrium dulce (Cav.) Nees -- accepted -- sweet shaggytuft
  Stenandrium dulce var. dulce (Cav.) Nees -- accepted -- sweet shaggytuft
  Stenandrium dulce var. floridanum A. Gray -- not accepted
  Stenandrium fasciculare auct. non (Benth.) Wassh. -- not accepted
  Stenandrium floridanum (A. Gray) Small -- not accepted
  Stenandrium tuberosum (L.) Urb. -- accepted -- mata espiritista
  Stenogyne Benth. -- accepted
  Stenogyne affinis C.N. Forbes -- not accepted
  Stenogyne affinis var. degeneri Sherff -- not accepted
  Stenogyne affinis var. retrorsa O. Deg. & Sherff -- not accepted
  Stenogyne angustifolia A. Gray -- accepted -- narrowleaf stenogyne
  Stenogyne angustifolia var. angustifolia A. Gray -- not accepted
  Stenogyne angustifolia var. hillebrandii Sherff -- not accepted
  Stenogyne angustifolia var. mauiensis Sherff -- not accepted
  Stenogyne angustifolia var. meeboldii Sherff -- not accepted
  Stenogyne angustifolia var. salicifolia Sherff -- not accepted
  Stenogyne angustifolia var. spathulata Sherff -- not accepted
  Stenogyne bifida Hillebr. -- accepted -- twocleft stenogyne
  Stenogyne biflora (Sherff) H. St. John -- not accepted
  Stenogyne calaminthoides A. Gray -- accepted -- bog stenogyne
  Stenogyne calaminthoides var. oxydonta Sherff -- not accepted
  Stenogyne calaminthoides var. subrotunda Sherff -- not accepted
  Stenogyne calaminthoides var. waimeana Sherff -- not accepted
  Stenogyne calycosa Sherff -- accepted -- Maui stenogyne
  Stenogyne campanulata Weller & Sakai -- accepted -- Kalalau Valley stenogyne
  Stenogyne cinerea Hillebr. -- accepted -- Kula stenogyne
  Stenogyne cranwelliae Sherff -- accepted -- Kohala Mountain stenogyne
  Stenogyne crenata A. Gray -- not accepted
  Stenogyne crenata var. muricata O. Deg. & Sherff -- not accepted
  Stenogyne diffusa A. Gray -- not accepted
  Stenogyne diffusa var. glabra Wawra -- not accepted
  Stenogyne glabrata (Hillebr.) Sherff -- not accepted
  Stenogyne haliakalae Wawra -- accepted -- Haleakala stenogyne
  Stenogyne hirsutula H. St. John -- not accepted
  Stenogyne kaalae Wawra -- accepted -- Kaala stenogyne
  Stenogyne kaalae ssp. kaalae Wawra -- accepted -- Kaala stenogyne
  Stenogyne kaalae ssp. sherffii (O. Deg.) W.L. Wagner & Weller -- accepted
  Stenogyne kaalae var. coriacea O. Deg. & Sherff -- not accepted
  Stenogyne kaalae var. latisepala Sherff -- not accepted
  Stenogyne kamehamehae Wawra -- accepted -- forest stenogyne
  Stenogyne kamehamehae var. albiflora Sherff -- not accepted
  Stenogyne kanehoana O. Deg. & Sherff -- accepted -- Oahu stenogyne
  Stenogyne kauaulaensis K.R. Wood & H. Oppenh. -- accepted
  Stenogyne kealiae Wawra -- accepted -- Keal's stenogyne
  Stenogyne kealiae var. angustata O. Deg. & Sherff -- not accepted
  Stenogyne macrantha Benth. -- accepted -- Hawai'i stenogyne
  Stenogyne macrantha var. amicarum O. Deg. & Sherff -- not accepted
  Stenogyne macrantha var. gracilis Sherff -- not accepted
  Stenogyne macrantha var. grayi H. Mann -- not accepted
  Stenogyne macrantha var. latifolia Hillebr. -- not accepted
  Stenogyne microphylla Benth. -- accepted -- littleleaf stenogyne
  Stenogyne mollis (Sherff) H. St. John -- not accepted
  Stenogyne oxygona O. Deg. & Sherff -- accepted -- jeweled stenogyne
  Stenogyne purpurea H. Mann -- accepted -- purplefruit stenogyne
  Stenogyne purpurea var. brevipedunculata Wawra -- not accepted
  Stenogyne purpurea var. forbesii Sherff -- not accepted
  Stenogyne purpurea var. leptophylla Sherff -- not accepted
  Stenogyne rotundifolia A. Gray -- accepted -- pua`ainaka
  Stenogyne rotundifolia var. oblonga Sherff -- not accepted
  Stenogyne rugosa Benth. -- accepted -- ma`ohi`ohi
  Stenogyne rugosa var. mollis Sherff -- not accepted
  Stenogyne rugosa var. subulata Sherff -- not accepted -- ma'ohi'ohi
  Stenogyne scandens Sherff -- not accepted
  Stenogyne scrophularioides Benth. -- accepted -- mohihi
  Stenogyne scrophularioides var. biflora Sherff -- not accepted
  Stenogyne scrophularioides var. nelsonii (Benth.) Sherff -- not accepted
  Stenogyne scrophularioides var. remyi Sherff -- not accepted
  Stenogyne scrophularioides var. skottsbergii Sherff -- not accepted
  Stenogyne serpens Hillebr. -- not accepted
  Stenogyne sessilis Benth. -- accepted -- fuzzyflower stenogyne
  Stenogyne sessilis var. hexantha Sherff -- not accepted
  Stenogyne sessilis var. hexanthoides O. Deg. & Sherff -- not accepted
  Stenogyne sessilis var. lanaiensis Sherff -- not accepted
  Stenogyne sessilis var. wilkesii Sherff -- not accepted
  Stenogyne sherffii O. Deg. -- not accepted
  Stenogyne sororia Sherff -- not accepted
  Stenogyne vagans Hillebr. -- not accepted
  Stenogyne viridis Hillebr. -- accepted -- Kaanapali stenogyne
  Stenolobium stans (L.) Seem. -- not accepted
  Stethoma comata (L.) Britton -- not accepted
  Stethoma pectoralis (Jacq.) Raf. -- not accepted
  Stethoma verticillaris (Nees) Britton -- not accepted
  Stomoisia cornuta (Michx.) Raf. -- not accepted
  Stomoisia juncea (Vahl) Barnhart -- not accepted
  Stomoisia virgatula (Barnhart) Barnhart -- not accepted
  Streptocarpus Lindl. -- accepted -- cape primrose
  Streptocarpus X hybridus Voss -- accepted -- Cape-primrose
  Striga Lour. -- accepted -- witchweed
  Striga asiatica (L.) Kuntze -- accepted -- witchweed, Asiatic witchweed
  Striga densiflora (Benth.) Benth. -- accepted -- witchweed, denseflower witchweed
  Striga gesnerioides (Willd.) Vatke -- accepted -- witchweed, cowpea witchweed
  Striga hermonthica (Delile) Benth. -- accepted -- witchweed, purple witchweed
  Striga lutea Lour. -- not accepted -- witchweed
  Strobilanthes Blume -- accepted
  Strobilanthes anisophylla (G. Lodd.) T. Anderson -- accepted
  Strobilanthes anisophylla f. isophylla (Nees) J.R.I. Wood -- not accepted -- bedding conehead
  Stylodon Raf. -- not accepted
  Stylodon carneus (Medik.) Moldenke -- not accepted -- Carolina false vervain
  Stylodon carolinensis (Walter) Small -- not accepted
  Synandra Nutt. -- accepted
  Synandra hispidula (Michx.) Britton -- not accepted -- Guyandotte beauty
  Synthyris Benth. -- accepted -- kittentails
  Synthyris alpina A. Gray -- accepted -- alpine kittentails
  Synthyris borealis Pennell -- accepted -- northern kittentails
  Synthyris bullii (Eaton) A. Heller -- accepted -- Bull's kittentails
  Synthyris canbyi Pennell -- accepted -- Mission Mountain kittentails
  Synthyris cordata (A. Gray) A. Heller -- accepted -- snowqueen
  Synthyris cymopteroides Pennell -- not accepted
  Synthyris dissecta Rydb. -- accepted -- cut-leaf kittentails
  Synthyris hendersonii Pennell -- not accepted
  Synthyris laciniata (A. Gray) Rydb. -- accepted -- western kittentails
  Synthyris laciniata ssp. ibapahensis Pennell -- not accepted
  Synthyris laciniata ssp. laciniata (A. Gray) Rydb. -- not accepted -- western kittenstails
  Synthyris lanuginosa (Piper) Pennell & J.W. Thomp. -- accepted -- featherleaf kittentails
  Synthyris missurica (Raf.) Pennell -- accepted -- tailed kittentails
  Synthyris missurica ssp. hirsuta Pennell -- not accepted -- western mountain kittentails
  Synthyris missurica ssp. major (Hook.) Pennell -- accepted
  Synthyris missurica ssp. missurica (Raf.) Pennell -- accepted -- tailed kittentails
  Synthyris missurica ssp. stellata (Pennell) Kartesz & Gandhi -- accepted -- western mountain kittentails
  Synthyris missurica var. major (Hook.) Pennell ex R.J. Davis -- not accepted
  Synthyris oblongifolia (Pennell) L. Hufford & M. McMahon -- accepted -- eggleaf kittentails
  Synthyris paysonii Pennell & L.O. Williams -- not accepted
  Synthyris pinnatifida S. Watson -- accepted -- featherleaf kittentails
  Synthyris pinnatifida var. canescens (Pennell) Cronquist -- not accepted -- hairy kittentails
  Synthyris pinnatifida var. laciniata A. Gray -- not accepted
  Synthyris pinnatifida var. lanuginosa (Piper) Cronquist -- not accepted -- featherleaf kittentails
  Synthyris pinnatifida var. pinnatifida S. Watson -- not accepted -- featherleaf kittentails
  Synthyris plantaginea (E. James) Benth. -- accepted -- White River kittentails
  Synthyris platycarpa Gail & Pennell -- accepted -- Idaho kittentails
  Synthyris ranunculina Pennell -- accepted -- Charleston Mountain kittentails
  Synthyris reniformis (Douglas ex Benth.) Benth. -- accepted -- snowqueen
  Synthyris reniformis var. cordata A. Gray -- not accepted -- snowqueen
  Synthyris reniformis var. major Hook. -- not accepted
  Synthyris reniformis var. reniformis (Douglas ex Benth.) Benth. -- not accepted -- snowqueen
  Synthyris ritteriana Eastw. -- accepted -- Ritter's kittentails
  Synthyris rubra (Douglas ex Hook.) Benth. -- accepted -- red kittentails
  Synthyris schizantha Piper -- accepted -- fringepetal kittentails
  Synthyris stellata Pennell -- not accepted
  Synthyris wyomingensis (A. Nelson) A. Heller -- accepted -- Wyoming kittentails
  Syringa L. -- accepted -- lilac
  Syringa amurensis Rupr. -- not accepted
  Syringa amurensis var. japonica (Maxim.) Franch. & Sav. -- not accepted
  Syringa emodi Wall. ex G. Don -- accepted
  Syringa josikaea Jacq. f. ex Rchb. -- accepted -- Hungarian lilac
  Syringa komarowii C.K. Schneid. -- accepted
  Syringa meyeri C.K. Schneid. -- accepted
  Syringa microphylla Diels -- not accepted
  Syringa oblata Lindl. -- accepted
  Syringa oblata ssp. dilatata (Nakai) P.S. Green & M.C. Chang -- accepted
  Syringa palibiniana Nakai -- not accepted
  Syringa pekinensis Rupr. -- accepted -- Peking tree lilac
  Syringa pubescens Turcz. -- accepted
  Syringa pubescens ssp. microphylla (Diels) M.C. Chang & X.L. Chen -- accepted
  Syringa pubescens ssp. patula (Palib.) M.C. Chang & X.L. Chen -- accepted
  Syringa reticulata (Blume) H. Hara -- accepted -- Japanese tree lilac
  Syringa reticulata ssp. amurensis (Rupr.) P.S. Green & M.C. Chang -- accepted -- Amur lilac
  Syringa reticulata ssp. pekinensis (Rupr.) P.S. Green & M.C. Chang -- not accepted -- Peking tree lilac
  Syringa reticulata ssp. reticulata (Blume) H. Hara -- accepted -- Japanese tree lilac
  Syringa reticulata var. mandschurica (Maxim.) H. Hara -- not accepted -- Manchuria lilac
  Syringa sweginzowii Koehne & Lingelsh. -- accepted
  Syringa villosa Vahl -- accepted -- villous lilac
  Syringa vulgaris L. -- accepted -- common lilac
  Syringa wolfii C.K. Schneid. -- accepted
  Syringa X chinensis Willd. -- accepted -- Chinese lilac
  Syringa X henryi C.K. Schneid. -- accepted
  Syringa X josiflexa I. Preston ex J.S. Pringle -- accepted
  Syringa X persica L. -- accepted -- Persian lilac
  Syringa X prestoniae McKelvey -- accepted
  Tabebuia Gomes ex DC. -- accepted -- trumpet-tree
  Tabebuia argentea (Bureau & K. Schum.) Britton -- not accepted
  Tabebuia aurea (Silva Manso) Benth. & Hook. f. ex S. Moore -- accepted -- Caribbean trumpet-tree
  Tabebuia capitata (Bureau & K. Schum.) Sandwith -- not accepted -- arawnig
  Tabebuia caraiba (Mart.) Bureau -- not accepted
  Tabebuia chrysantha (Jacq.) G. Nicholson -- not accepted -- roble amarillo
  Tabebuia donnell-smithii Rose -- not accepted -- primavera
  Tabebuia glomerata Urb. -- not accepted
  Tabebuia haemantha (Bertol. ex Spreng.) DC. -- accepted -- roble cimarron
  Tabebuia heterophylla (DC.) Britton -- accepted -- white cedar
  Tabebuia heterophylla ssp. pallida auct. non (Miers) Stehlé -- not accepted
  Tabebuia lucida Britton -- not accepted
  Tabebuia pallida sensu Liogier & Martorell, non Miers -- not accepted -- white cedar
  Tabebuia pentaphylla (DC.) Hemsl. -- not accepted
  Tabebuia rigida Urb. -- accepted -- roble de sierra
  Tabebuia rosea (Bertol.) DC. -- accepted -- pink poui, pink trumpet-tree
  Tabebuia rufescens J.R. Johnst. -- accepted -- black poui, cogwood, greenheart
  Tabebuia schumanniana Urb. -- accepted -- roble colorado
  Tabebuia serratifolia (Vahl) G. Nicholson -- not accepted -- yellow poui
  Tabebuia triphylla DC. -- not accepted
  Tamonea Aubl. -- accepted
  Tamonea boxiana (Moldenke) R.A. Howard -- accepted -- crow broom
  Tamonea curassavica (L.) Pers. -- accepted
  Tamonea spicata auct. non Sw. -- not accepted
  Tamonea spinosa Sw. -- not accepted -- cardero
  Tecoma Juss. -- accepted -- trumpetbush
  Tecoma capensis (Thunb.) Lindl. -- accepted -- cape honeysuckle, Cape honeysuckle
  Tecoma castanifolia (D. Don) Melch. -- accepted -- chestnutleaf trumpetbush
  Tecoma gaudichaudii DC. -- not accepted
  Tecoma radicans (L.) Juss. -- not accepted
  Tecoma ricasoliana Tanfani -- not accepted
  Tecoma rosea Bertol. -- not accepted
  Tecoma serratifolia (Vahl) G. Don -- not accepted
  Tecoma stans (L.) Juss. ex Kunth -- accepted -- yellow elder, yellow trumpet-flower, trumpetbush, trumpetflower, yellow trumpetbush
  Tecoma stans var. angustatum Rehder -- not accepted
  Tecomanthe Baill. -- accepted
  Tecomanthe dendrophila (Blume) K. Schum. -- accepted
  Tecomaria capensis (Thunb.) Spach -- not accepted
  Tectona L. f. -- accepted
  Tectona grandis L. f. -- accepted -- teak
  Teliostachya Nees -- accepted
  Teliostachya alopecuroidea (Vahl) Nees -- not accepted -- pata de gallina
  Terania frutescens Berland. -- not accepted
  Tetrachondraceae -- accepted
  Tetraclea A. Gray -- accepted
  Tetraclea coulteri A. Gray -- accepted -- Coulter's wrinklefruit
  Tetraclea coulteri var. angustifolia (Wooton & Standl.) A. Nelson & J.F. Macbr. -- not accepted
  Tetraclea coulteri var. coulteri A. Gray -- not accepted -- Coulter's wrinklefruit
  Tetraclea viscida Lundell -- not accepted
  Tetramerium Nees -- accepted
  Tetramerium hispidum Nees -- not accepted
  Tetramerium nervosum Nees -- accepted -- hairy fournwort
  Tetramerium nervosum var. hispidum (Nees) Torr. -- not accepted
  Tetramerium platystegium Torr. -- not accepted
  Teucrium L. -- accepted -- germander
  Teucrium boreale E.P. Bicknell -- not accepted
  Teucrium botrys L. -- accepted -- cutleaf germander
  Teucrium canadense L. -- accepted -- wood sage, hairy germander, American germander, Canada germander
  Teucrium canadense ssp. occidentale (A. Gray) W.A. Weber -- not accepted
  Teucrium canadense ssp. viscidum (Piper) Roy L. Taylor & MacBryde -- not accepted
  Teucrium canadense var. angustatum A. Gray -- not accepted
  Teucrium canadense var. boreale (E.P. Bicknell) Shinners -- not accepted
  Teucrium canadense var. canadense L. -- accepted -- Canada germander, American germander
  Teucrium canadense var. hypoleucum Griseb. -- accepted -- Canada germander
  Teucrium canadense var. littorale (E.P. Bicknell) Fernald -- not accepted
  Teucrium canadense var. nashii (Kearney) Shinners -- not accepted
  Teucrium canadense var. occidentale (A. Gray) E.M. McClint. & Epling -- accepted -- western germander, American germander
  Teucrium canadense var. virginicum (L.) Eaton -- not accepted -- Virginia germander
  Teucrium chamaedrys L. -- accepted -- wall germander
  Teucrium coahuilanum B.L. Turner -- accepted
  Teucrium cubense Jacq. -- accepted -- small coastal germander
  Teucrium cubense ssp. depressum (Small) E.M. McClint. & Epling -- not accepted
  Teucrium cubense ssp. laevigatum (Vahl) E.M. McClint. & Epling -- not accepted
  Teucrium cubense var. cubense Jacq. -- not accepted -- Cuban germander, small coastal germander
  Teucrium cubense var. densum Jeps. -- not accepted -- small coastal germander
  Teucrium cubense var. laevigatum (Vahl) Shinners -- not accepted -- small coastal germander
  Teucrium depressum Small -- accepted -- small coastal germander
  Teucrium fruticans L. -- accepted -- shrubby germander
  Teucrium glandulosum Kellogg -- accepted -- common germander, sticky germander
  Teucrium laciniatum Torr. -- accepted -- germander, lacy germander
  Teucrium littorale E.P. Bicknell -- not accepted
  Teucrium nashii Kearney -- not accepted
  Teucrium occidentale A. Gray -- not accepted
  Teucrium occidentale var. boreale (E.P. Bicknell) Fernald -- not accepted
  Teucrium orientale L. -- accepted -- oriental germander, Oriental germander
  Teucrium scorodonia L. -- accepted -- woodland germander
  Thalesia fasciculata (Nutt.) Britton -- not accepted
  Thalesia lutea (Parry) Rydb. -- not accepted
  Thalesia uniflora (L.) Britton -- not accepted
  Thunbergia Retz. -- accepted
  Thunbergia alata Bojer ex Sims -- accepted -- blackeyed Susan vine
  Thunbergia erecta (Benth.) T. Anderson -- accepted -- bush clockvine
  Thunbergia fragrans Roxb. -- accepted -- whitelady
  Thunbergia grandiflora Roxb. -- accepted -- Bengal trumpet
  Thunbergia laurifolia Lindl. -- accepted -- laurel clockvine
  Thunbergia volubilis Pers. -- not accepted
  Thymus L. -- accepted -- thyme
  Thymus arcticus (Durand) Ronniger -- not accepted
  Thymus capitatus (L.) Hoffmanns. & Link -- accepted
  Thymus drucei Ronniger -- not accepted
  Thymus kosteletzkyanus Opiz -- accepted -- Eurasian thyme
  Thymus lanicaulis Ronniger -- not accepted
  Thymus marschallianus Willd. -- not accepted
  Thymus pannonicus All. -- not accepted -- Eurasian thyme
  Thymus praecox Opiz -- accepted -- mother of thyme
  Thymus praecox ssp. arcticus (Durand) Jalas -- accepted -- creeping thyme
  Thymus pulegioides L. -- accepted -- lemon thyme
  Thymus serpyllum auct. non L. -- not accepted -- creeping thyme, hillwort, lemon thyme, mother of thyme, penny mountain, wild thyme
  Thymus serpyllum ssp. chamaedrys (Fr.) Celak. -- not accepted
  Thymus serpyllum var. albus hort. -- not accepted
  Thymus thracicus Velen. -- accepted
  Thymus vulgaris L. -- accepted -- garden thyme
  Thyrsacanthus cuspidatus Nees -- not accepted
  Thyrsacanthus nitidus (Jacq.) Nees -- not accepted
  Thyrsacanthus strictus Nees -- not accepted
  Tomanthera Raf. -- not accepted
  Tomanthera auriculata (Michx.) Raf. -- not accepted -- auriculate false-foxglove
  Tomanthera densiflora (Benth.) Pennell -- not accepted
  Tonella Nutt. ex A. Gray -- accepted
  Tonella floribunda A. Gray -- accepted -- manyflower tonella
  Tonella tenella (Benth.) A. Heller -- accepted -- lesser baby innocence
  Torenia L. -- accepted
  Torenia asiatica L. -- accepted -- wishbone flower
  Torenia crustacea (L.) Cham. & Schltdl. -- not accepted
  Torenia fournieri Linden ex E. Fourn. -- accepted -- bluewings
  Tragiola pilosa (Michx.) Small & Pennell -- not accepted
  Tragiola pilosa ssp. epilis (Pennell) Pennell -- not accepted
  Trichantha ambigua (Urb.) Wiehler -- not accepted
  Trichostema L. -- accepted -- bluecurls
  Trichostema arizonicum A. Gray -- accepted -- Arizona bluecurls
  Trichostema austromontanum F.H. Lewis -- accepted -- San Jacinto bluecurls
  Trichostema austromontanum ssp. austromontanum F.H. Lewis -- accepted -- San Jacinto bluecurls
  Trichostema austromontanum ssp. compactum F.H. Lewis -- accepted -- Hidden Lake bluecurls, San Jacinto bluecurls
  Trichostema brachiatum L. -- accepted -- fluxweed
  Trichostema dichotomum L. -- accepted -- forked bluecurls, blue curls
  Trichostema dichotomum var. lineare (Walter) Pursh -- not accepted
  Trichostema dichotomum var. puberulum Fernald & Griscom -- not accepted
  Trichostema lanatum Benth. -- accepted -- woolly bluecurls
  Trichostema lanceolatum Benth. -- accepted -- vinegarweed
  Trichostema laxum A. Gray -- accepted -- turpentine weed
  Trichostema laxum var. rubisepalum (Elmer) Jeps. -- not accepted
  Trichostema lineare Walter -- not accepted
  Trichostema micranthum A. Gray -- accepted -- small-flower bluecurls, smallflower bluecurls
  Trichostema oblongum Benth. -- accepted -- oblong bluecurls
  Trichostema ovatum Curran -- accepted -- San Joaquin bluecurls
  Trichostema parishii Vasey -- accepted -- Parish's bluecurls
  Trichostema pilosum Roth -- not accepted
  Trichostema rubisepalum Elmer -- accepted -- Hernandez's bluecurls
  Trichostema ruygtii H. Lewis -- accepted
  Trichostema setaceum Houtt. -- accepted -- narrowleaf bluecurls
  Trichostema simulatum Jeps. -- accepted -- Siskiyou bluecurls
  Trichostema suffrutescens Kearney -- accepted -- Florida scrub bluecurls
  Triphysaria Fisch. & C.A. Mey. -- accepted -- owl's-clover
  Triphysaria eriantha (Benth.) T.I. Chuang & Heckard -- accepted -- johnny-tuck
  Triphysaria eriantha ssp. eriantha (Benth.) T.I. Chuang & Heckard -- accepted -- johnny-tuck
  Triphysaria eriantha ssp. rosea (A. Gray) T.I. Chuang & Heckard -- accepted -- johnny-tuck
  Triphysaria floribunda (Benth.) T.I. Chuang & Heckard -- accepted -- San Francisco owl's-clover
  Triphysaria micrantha (Greene ex A. Heller) T.I. Chuang & Heckard -- accepted -- purplebeak owl's-clover
  Triphysaria pusilla (Benth.) T.I. Chuang & Heckard -- accepted -- dwarf owl's-clover
  Triphysaria versicolor Fisch. & C.A. Mey. -- accepted -- yellowbeak owl's-clover
  Triphysaria versicolor ssp. faucibarbatus (A. Gray) T.I. Chuang & Heckard -- accepted -- yellowbeak owl's-clover
  Triphysaria versicolor ssp. versicolor Fisch. & C.A. Mey. -- accepted -- yellowbeak owl's-clover
  Tubiflora acuminata Small -- not accepted
  Tubiflora angustifolia (Fernald) Small -- not accepted
  Tubiflora caroliniensis J.F. Gmel. -- not accepted
  Tynanthus Miers -- accepted
  Tynanthus caryophylleus (Bello) Alain -- not accepted
  Tynanthus polyanthus (Bureau) Sandwith -- accepted -- bejuco de clavo
  Utricularia L. -- accepted -- bladderwort
  Utricularia amethystina Salzm. ex A. St.-Hil. & Girard -- accepted -- Florida purple bladderwort
  Utricularia bifida L. -- accepted -- bladderwort
  Utricularia biflora Lam. -- not accepted
  Utricularia caerulea L. -- accepted -- bladderwort
  Utricularia cleistogama (A. Gray) Britton -- not accepted
  Utricularia cornuta Michx. -- accepted -- horned bladderwort
  Utricularia exoleta R. Br. -- not accepted -- bladderwort
  Utricularia fibrosa Walter -- not accepted -- fibrous bladderwort
  Utricularia fibrosa auct. non Walter -- not accepted
  Utricularia fimbriata auct. non Kunth -- not accepted
  Utricularia floridana Nash -- accepted -- Florida yellow bladderwort
  Utricularia foliosa L. -- accepted -- leafy bladderwort
  Utricularia geminiscapa Benj. -- accepted -- hidden-fruited bladderwort, hiddenfruit bladderwort
  Utricularia gibba L. -- accepted -- humped bladderwort, conespur bladderpod
  Utricularia guyanensis A. DC. -- accepted
  Utricularia inflata Walter -- accepted -- swollen bladderwort
  Utricularia inflata var. minor Chapm. -- not accepted
  Utricularia intermedia Hayne -- accepted -- flat-leaf bladderwort, mountain bladderwort, flatleaf bladderwort
  Utricularia juncea Vahl -- accepted -- southern bladderwort
  Utricularia macrorhiza Leconte -- not accepted -- common bladderpod, greater bladderwort, common bladderwort
  Utricularia minor L. -- accepted -- lesser bladderwort
  Utricularia mixta Barnhart -- not accepted
  Utricularia obtusa Sw. -- not accepted
  Utricularia occidentalis A. Gray -- not accepted
  Utricularia ochroleuca R.W. Hartm. -- accepted -- yellowishwhite bladderwort
  Utricularia olivacea C. Wright -- accepted -- piedmont bladderwort
  Utricularia peckii S.F. Blake -- not accepted
  Utricularia pumila Walter -- not accepted
  Utricularia purpurea Walter -- accepted -- purple bladderwort, utriculaire pourpre, eastern purple bladderwort
  Utricularia pusilla Vahl -- accepted -- tiny bladderwort
  Utricularia racemosa Wall. -- not accepted -- bladderwort
  Utricularia radiata Small -- accepted -- little floating bladderwort
  Utricularia resupinata B.D. Greene ex Bigelow -- accepted -- northeastern bladderwort, lavender bladderwort
  Utricularia simulans Pilg. -- accepted -- fringed bladderwort
  Utricularia striata Leconte ex Torr. -- accepted -- striped bladderwort
  Utricularia stygia G. Thor -- not accepted -- arctic bladderwort
  Utricularia subulata L. -- accepted -- zigzag bladderwort
  Utricularia uliginosa Vahl -- accepted -- bladderwort
  Utricularia virgatula Barnhart -- not accepted
  Utricularia vulgaris L. -- accepted
  Utricularia vulgaris ssp. macrorhiza (Leconte) R.T. Clausen -- accepted
  Utricularia vulgaris var. americana A. Gray -- not accepted
  Valerianoides cayennensis (Rich.) Kuntze -- not accepted
  Valerianoides jamaicensis (L.) Kuntze -- not accepted
  Valerianoides strigosa (Vahl) Britton -- not accepted
  Vandellia diffusa L. -- not accepted
  Verbascum L. -- accepted -- mullein
  Verbascum blattaria L. -- accepted -- moth mullein, white moth mullein
  Verbascum bombyciferum Boiss. -- accepted -- Turkish mullein
  Verbascum chaixii Vill. -- accepted -- nettle-leaf mullein
  Verbascum densiflorum Bertol. -- accepted -- denseflower mullein
  Verbascum lychnitis L. -- accepted -- white mullein
  Verbascum lychnitis ssp. lychnitis L. -- accepted -- white mullein
  Verbascum nigrum L. -- accepted -- black mullein
  Verbascum phlomoides L. -- accepted -- orange mullein
  Verbascum phoeniceum L. -- accepted -- purple mullein
  Verbascum phoeniceum var. phoeniceum L. -- accepted -- purple mullein
  Verbascum phoenicium L. -- not accepted
  Verbascum pulverulentum Vill. -- accepted -- broad-leaf mullein, violetstamen mullein
  Verbascum pyramidatum M. Bieb. -- accepted
  Verbascum sinuatum L. -- accepted -- wavyleaf mullein
  Verbascum sinuatum var. sinuatum L. -- accepted -- wavyleaf mullein
  Verbascum speciosum Schrad. -- accepted -- showy mullein
  Verbascum thapsiforme Schrad. -- not accepted
  Verbascum thapsus L. -- accepted -- big taper, flannel plant, velvet dock, velvet plant, woolly mullein, flannel mullein, great mullein, mullein, common mullein
  Verbascum thapsus ssp. thapsus L. -- accepted -- common mullein
  Verbascum virgatum Stokes -- accepted -- wand mullein
  Verbascum X kerneri Fritsch -- accepted -- Kerner's mullein
  Verbascum X pterocaulon Franch. -- accepted -- mullein
  Verbascum X ramigerum Link ex Schrad. -- accepted
  Verbascum X spurium K. Koch -- accepted -- mullein
  Verbena L. -- accepted -- vervain
  Verbena abramsii Moldenke -- not accepted -- San Bernardino vervain
  Verbena ambrosiifolia Rydb. ex Small -- not accepted
  Verbena angustifolia Michx. -- not accepted
  Verbena arizonica Briq. -- not accepted
  Verbena bipinnatifida Nutt. -- not accepted
  Verbena bipinnatifida var. brevispicata (Umber) Moldenke -- not accepted
  Verbena bipinnatifida var. latilobata L.M. Perry -- not accepted
  Verbena blanchardi Moldenke -- not accepted
  Verbena bonariensis L. -- accepted -- pretty verbena, purpletop vervain
  Verbena bonariensis var. bonariensis L. -- accepted -- purpletop vervain
  Verbena bonariensis var. conglomerata Briq. -- accepted -- purpletop vervain
  Verbena bracteata Cav. ex Lag. & Rodr. -- accepted -- bracted vervain, prostrate vervain, carpet vervain, prostrate verbena, bigbract verbena
  Verbena bracteosa Michx. -- not accepted
  Verbena brasiliensis Vell. -- accepted -- Brazilian vervain
  Verbena californica Moldenke -- accepted -- Red Hills vervain, California vervain
  Verbena cameronensis L.I. Davis -- not accepted
  Verbena canadensis (L.) Britton -- not accepted
  Verbena canadensis var. atroviolacea Dermen -- not accepted
  Verbena canadensis var. compacta Dermen -- not accepted
  Verbena canadensis var. drummondii (Lindl.) E.M. Baxter -- not accepted
  Verbena canadensis var. grandiflora (J.N. Haage & Schmidt) Moldenke -- not accepted
  Verbena canadensis var. lambertii (Sims) Thell. -- not accepted
  Verbena canescens Kunth -- accepted -- gray vervain
  Verbena canescens var. roemeriana (Scheele) L.M. Perry -- not accepted
  Verbena carnea Medik. -- accepted
  Verbena carolina L. -- accepted -- Carolina vervain
  Verbena carolinensis (Walter) J.G. Gmel. -- not accepted
  Verbena chiricahensis (Umber) Moldenke -- not accepted
  Verbena ciliata Benth. -- not accepted
  Verbena ciliata var. longidentata L.M. Perry -- not accepted
  Verbena ciliata var. pubera (Greene) L.M. Perry -- not accepted
  Verbena clemensorum Moldenke -- not accepted
  Verbena cloverae Moldenke -- accepted -- Clover's vervain
  Verbena cloverae var. lilacina Moldenke -- not accepted
  Verbena delticola Small -- not accepted
  Verbena demareei Moldenke -- not accepted
  Verbena ehrenbergiana Schauer -- accepted -- Ehrenberg's vervain
  Verbena elegans Kunth -- not accepted
  Verbena elegans var. asperata L.M. Perry -- not accepted
  Verbena gooddingii Briq. -- not accepted
  Verbena gooddingii var. nepetifolia Tidestr. -- not accepted
  Verbena gracilis Desf. -- accepted -- Fort Huachuca verbena, Fort Huachuca vervain
  Verbena halei Small -- accepted -- slender verbena, Texas verbena, Texas vervain
  Verbena hastata L. -- accepted -- blue vervain, blue verbena, Simpler's-joy, swamp verbena
  Verbena hastata var. hastata L. -- accepted -- swamp verbena, Simpler's-joy
  Verbena hastata var. scabra Moldenke -- accepted -- Simpler's-joy, swamp verbena
  Verbena hispida Ruiz & Pav. -- not accepted -- hairy vervain
  Verbena hybrida Groenland & Rümpler -- not accepted -- garden vervain
  Verbena imbricata Wooton & Standl. -- not accepted
  Verbena incisa Hook. -- not accepted
  Verbena inconspicua Greene -- not accepted
  Verbena lambertii Sims -- not accepted
  Verbena lasiostachys Link -- accepted -- western vervain
  Verbena lasiostachys var. abramsii (Moldenke) Jeps. -- not accepted -- San Bernardino vervain
  Verbena lasiostachys var. lasiostachys Link -- accepted -- western vervain
  Verbena lasiostachys var. scabrida Moldenke -- accepted
  Verbena lasiostachys var. septentrionalis Moldenke -- not accepted
  Verbena litoralis Kunth -- accepted -- seashore vervain
  Verbena litoralis var. brevibracteata (Kuntz) N. O'Leary -- accepted -- seashore vervain
  Verbena litoralis var. litoralis Kunth -- accepted -- seashore vervain
  Verbena lundelliorum Moldenke -- not accepted
  Verbena macdougalii A. Heller -- accepted -- hillside verbena, MacDougal verbena
  Verbena maritima Small -- not accepted
  Verbena menthifolia Benth. -- accepted -- mint vervain
  Verbena montevidensis Spreng. -- accepted -- Uruguayan vervain
  Verbena neomexicana (A. Gray) Small -- accepted -- New Mexico verbena, hillside vervain
  Verbena neomexicana var. hirtella L.M. Perry -- accepted -- hillside verbena, New Mexico verbena, hillside vervain
  Verbena neomexicana var. neomexicana (A. Gray) Small -- accepted -- hillside vervain, New Mexican verbena
  Verbena neomexicana var. xylopoda L.M. Perry -- accepted -- hillside verbena, hillside vervain
  Verbena officinalis L. -- accepted -- herb of the cross
  Verbena officinalis ssp. halei (Small) Barber -- not accepted
  Verbena officinalis var. officinalis L. -- accepted -- herb of the cross
  Verbena officinalis var. prostrata Gren. & Godr. -- accepted -- prostrate verbena
  Verbena perennis Wooton -- accepted -- perennial verbena, pinleaf vervain
  Verbena peruviana (L.) Britton -- not accepted
  Verbena pinetorum Moldenke -- accepted -- Chihuahuan vervain
  Verbena plicata Greene -- accepted -- fan-leaf vervain, whiteveined verbena, fanleaf vervain
  Verbena plicata var. degeneri Moldenke -- not accepted -- Degener's vervain
  Verbena plicata var. plicata Greene -- not accepted -- fanleaf vervain
  Verbena polyantha (Umber) Moldenke -- not accepted
  Verbena polystachya Kunth -- not accepted -- verbena
  Verbena prostrata R. Br. -- not accepted
  Verbena pubera Greene -- not accepted
  Verbena pulchella Greene -- not accepted
  Verbena pulchella Sweet -- not accepted
  Verbena pulchella var. gracilior (Tronc.) Shinners -- not accepted
  Verbena pumila Rydb. -- not accepted
  Verbena quadrangulata A. Heller -- not accepted
  Verbena quandrangulata A. Heller -- not accepted
  Verbena racemosa Eggert -- not accepted
  Verbena rigida Spreng. -- accepted -- tuberous vervain
  Verbena rigida var. lilacina (G. Harrow) Moldenke -- not accepted
  Verbena riparia Raf. ex Small & A. Heller -- not accepted -- riverbank vervain
  Verbena robusta Greene -- not accepted
  Verbena runyonii Moldenke -- not accepted -- Rio Grande vervain
  Verbena scabra Vahl -- accepted -- sandpaper vervain
  Verbena simplex Lehm. -- accepted -- narrow-leaved vervain, verveine simple, simple verbena, narrowleaf vervain
  Verbena squamosa Jacq. -- not accepted
  Verbena stricta Vent. -- accepted -- tall vervain, woolly verbena, hoary vervain, hoary verbena
  Verbena supina L. -- accepted -- supine vervain
  Verbena tampensis Nash -- not accepted
  Verbena tenera Spreng. -- not accepted
  Verbena tenuisecta Briq. -- not accepted
  Verbena tenuisecta var. alba Moldenke -- not accepted
  Verbena tumidula L.M. Perry -- not accepted
  Verbena urticifolia L. -- accepted -- white verbena, white vervain
  Verbena urticifolia var. incarnata (Raf.) Moldenke -- not accepted -- white vervain
  Verbena urticifolia var. leiocarpa L.M. Perry & Fernald -- accepted -- white vervain
  Verbena urticifolia var. simplex Farw. -- not accepted -- white vervain
  Verbena urticifolia var. urticifolia L. -- accepted -- white vervain
  Verbena venosa Gillies & Hook. -- not accepted
  Verbena verecunda (Umber) Moldenke -- not accepted
  Verbena verna A. Nelson -- not accepted
  Verbena verna var. fissa A. Nelson -- not accepted
  Verbena wrightii A. Gray -- not accepted
  Verbena X allenii Moldenke -- accepted -- Allen's verbena
  Verbena X bingenensis Moldenke -- accepted
  Verbena X blanchardii Moldenke -- accepted -- Blanchard's verbena
  Verbena X clemensiorum Moldenke -- accepted -- Amador County vervain
  Verbena X crookshanksii Moldenke -- accepted -- Crookshank's verbena
  Verbena X deamii Moldenke (pro. sp.) -- accepted -- Deam's verbena
  Verbena X dodgei B. Boivin -- not accepted
  Verbena X engelmannii Moldenke -- accepted -- Engelmann's verbena
  Verbena X goodmanii Moldenke -- accepted -- Goodman's verbena
  Verbena X hybrida Groenland & Rümpler -- not accepted
  Verbena X illicita Moldenke -- accepted -- illicit verbena
  Verbena X moechina Moldenke -- accepted
  Verbena X oklahomensis Moldenke -- not accepted
  Verbena X paniculatistricta Engelm. -- not accepted
  Verbena X perriana Moldenke -- accepted
  Verbena X rydbergii Moldenke -- accepted -- Rydberg's verbena
  Verbena X stuprosa Moldenke -- accepted
  Verbena xutha Lehm. -- accepted -- Gulf vervain
  Verbenaceae -- accepted -- verbenas, verbénacées
  Veronica L. -- accepted -- speedwell
  Veronica agrestis L. -- accepted -- field speedwell, green field speedwell
  Veronica alpina L. -- accepted -- alpine speedwell
  Veronica alpina ssp. australis (Wahlenb.) Á. Löve & D. Löve -- not accepted
  Veronica alpina var. alpina L. -- not accepted -- alpine speedwell
  Veronica alpina var. alterniflora Fernald -- not accepted
  Veronica alpina var. australis Wahlenb. -- not accepted -- alpine speedwell
  Veronica alpina var. cascadensis Fernald -- not accepted
  Veronica alpina var. geminiflora Fernald -- not accepted
  Veronica alpina var. nutans (Bong.) B. Boivin -- not accepted
  Veronica alpina var. terrae-novae Fernald -- not accepted
  Veronica alpina var. unalaschcensis Cham. & Schltdl. -- not accepted
  Veronica americana Schwein. ex Benth. -- accepted -- brooklime, American speedwell
  Veronica anagallis L. -- not accepted -- water speedwell
  Veronica anagallis-aquatica L. -- accepted -- water speedwell, blue water speedwell
  Veronica arguteserrata Regel & Schmalh. -- accepted -- sawtooth speedwell
  Veronica arvensis L. -- accepted -- rock speedwell, wall speedwell, common speedwell, corn speedwell
  Veronica austriaca L. -- accepted -- broadleaf speedwell
  Veronica austriaca ssp. teucrium (L.) D.A. Webb -- not accepted -- broadleaf speedwell
  Veronica austriaca ssp. vahlii (Gaudin) D.A. Webb -- accepted -- Vahl's speedwell
  Veronica bachofenii Heuffel -- not accepted
  Veronica barrelieri Schott ex Roem. & Schult. -- accepted
  Veronica beccabunga L. -- accepted -- European speedwell
  Veronica biloba L. -- accepted -- bilobed speedwell, twolobed speedwell, twolobe speedwell
  Veronica campylopoda Boiss. -- accepted -- bent-foot speedwell
  Veronica catenata Pennell -- accepted -- sessile water-speedwell, chain speedwell
  Veronica catenata var. glandulosa (Farw.) Pennell -- not accepted
  Veronica chamaedrys L. -- accepted -- germander speedwell
  Veronica comosa K. Richt. -- not accepted
  Veronica comosa var. glaberrima (Pennell) B. Boivin -- not accepted
  Veronica comosa var. glandulosa (Farw.) B. Boivin -- not accepted
  Veronica connata Raf. -- not accepted
  Veronica connata ssp. glaberrima Pennell -- not accepted
  Veronica connata var. glaberrima (Pennell) Fernald -- not accepted
  Veronica connata var. typica Pennell -- not accepted
  Veronica copelandii Eastw. -- accepted -- Copeland's speedwell
  Veronica crinita Kit. -- not accepted -- fringed speedwell
  Veronica cusickii A. Gray -- accepted -- Cusick's speedwell
  Veronica cymbalaria Bodard -- accepted -- glandular speedwell
  Veronica decussata auct. non Aiton -- not accepted
  Veronica didyma Ten. -- not accepted
  Veronica dillenii Crantz -- accepted -- Dillenius' speedwell
  Veronica filiformis Sm. -- accepted -- creeping speedwell, creeping veronica, slender speedwell, Whetzel weed, threadstalk speedwell
  Veronica franciscana Eastw. -- not accepted
  Veronica fruticans Jacq. -- accepted -- woodystem speedwell
  Veronica gentianoides Vahl -- accepted
  Veronica glandifera Pennell -- not accepted
  Veronica glandulifera Freyn -- not accepted
  Veronica grandiflora Gaertn. -- accepted -- largeflower speedwell
  Veronica grandis Fisch. ex Spreng. -- accepted -- heartleaf speedwell
  Veronica hederifolia L. -- accepted -- ivyleaf speedwell
  Veronica humifusa Dicks. -- not accepted
  Veronica incana L. -- accepted -- spiked speedwell
  Veronica latifolia L. -- not accepted
  Veronica longifolia L. -- accepted -- long-leaf speedwell, longleaf speedwell
  Veronica micromera Wooton & Standl. -- not accepted
  Veronica micromeria Wooton & Standl. -- not accepted
  Veronica nutans Bong. -- not accepted
  Veronica officinalis L. -- accepted -- common gypsyweed
  Veronica officinalis var. officinalis L. -- accepted -- common gypsyweed
  Veronica officinalis var. tournefortii auct. non (Vill.) Rchb. -- not accepted -- common gypsyweed
  Veronica opaca Fr. -- accepted -- broadsepal speedwell
  Veronica peregrina L. -- accepted -- purslane speedwell, neckweed
  Veronica peregrina ssp. peregrina L. -- not accepted -- neckweed
  Veronica peregrina ssp. xalapensis (Kunth) Pennell -- not accepted -- hairy purslane speedwell, neckweed
  Veronica peregrina var. typica Pennell -- not accepted
  Veronica peregrina var. xalapensis (Kunth) Pennell -- not accepted
  Veronica persica Poir. -- accepted -- winter speedwell, bird-eye speedwell, birdseye speedwell, Persian speedwell
  Veronica persica var. aschersoniana (Lehm.) B. Boivin -- not accepted
  Veronica persica var. corrensiana (Lehm.) B. Boivin -- not accepted
  Veronica persica var. persica Poir. -- not accepted -- birdeye speedwell
  Veronica plebeia R. Br. -- accepted -- island speedwell
  Veronica plebia R. Br. -- not accepted -- island speedwell
  Veronica polita Fr. -- accepted -- gray field speedwell
  Veronica prostrata L. -- accepted -- prostrate speedwell
  Veronica salina auct. non Schur -- not accepted
  Veronica scutellata L. -- accepted -- grass-leaf speedwell, marsh speedwell, grassleaf speedwell, skullcap speedwell
  Veronica scutellata var. villosa Schumach. -- not accepted
  Veronica serpyllifolia L. -- accepted -- thyme-leaf speedwell, thymeleaf speedwell
  Veronica serpyllifolia ssp. humifusa (Dicks.) Syme -- not accepted -- brightblue speedwell, thyme-leaf speedwell
  Veronica serpyllifolia ssp. serpyllifolia L. -- not accepted -- thymeleaf speedwell
  Veronica serpyllifolia var. borealis Laest. -- not accepted
  Veronica serpyllifolia var. humifusa (Dicks.) Vahl -- not accepted
  Veronica serpyllifolia var. nummularioides Lecoq & Lamotte -- not accepted
  Veronica sherwoodii M. Peck -- not accepted
  Veronica speciosa R. Cunn. ex A. Cunn. -- not accepted
  Veronica spicata L. -- accepted -- spiked speedwell
  Veronica spicata ssp. incana (L.) Walters -- not accepted -- spiked speedwell
  Veronica spicata ssp. spicata L. -- not accepted -- spiked speedwell
  Veronica spuria L. -- not accepted -- bastard speedwell
  Veronica stelleri Pall. ex Schrad. & Link -- accepted
  Veronica stelleri var. glabrescens Hultén -- not accepted
  Veronica sublobata M.A. Fisch. -- accepted -- false ivy-leaved speedwell
  Veronica tenella All. -- not accepted
  Veronica teucrium L. -- accepted
  Veronica tournefortii auct. non Vill. -- not accepted
  Veronica triloba Opiz -- accepted -- trilobed speedwell
  Veronica triphyllos L. -- accepted -- lobed speedwell, finger speedwell
  Veronica undulata Wall. -- accepted -- undulate speedwell
  Veronica verna L. -- accepted -- spring speedwell
  Veronica virginica L. -- not accepted
  Veronica wormskjoldii Roem. & Schult. -- accepted -- American alpine speedwell
  Veronica wormskjoldii ssp. alterniflora (Fernald) Pennell -- not accepted
  Veronica wormskjoldii ssp. nutans (Bong.) Pennell -- accepted -- American alpine speedwell
  Veronica wormskjoldii ssp. wormskjoldii Roem. & Schult. -- accepted -- American alpine speedwell
  Veronica wormskjoldii var. stelleri (Pall. ex Schrad. & Link) S.L. Welsh -- not accepted
  Veronica wormskjoldii var. wormskjoldii Roem. & Schult. -- not accepted -- American alpine speedwell
  Veronica X lackschewitzii Keller -- accepted
  Veronica xalapensis Kunth -- not accepted
  Veronicastrum Heist. ex Fabr. -- accepted
  Veronicastrum serpyllifolium (L.) Fourr. -- not accepted
  Veronicastrum serpyllifolium ssp. humifusum (Dicks.) W.A. Weber -- not accepted
  Veronicastrum virginicum (L.) Farw. -- accepted -- Culver's root
  Vesiculina purpurea (Walter) Raf. -- not accepted
  Vitex L. -- accepted -- chastetree
  Vitex agnus-castus L. -- accepted -- chaste tree, lilac chastetree
  Vitex agnus-castus var. agnus-castus L. -- accepted -- lilac chastetree
  Vitex agnus-castus var. caerulea Rehder -- accepted -- lilac chastetree
  Vitex divaricata Sw. -- accepted -- higuerillo
  Vitex glabrata R. Br. -- accepted -- smooth chastetree
  Vitex negundo L. -- accepted -- negundo chastetree, Chinese chastetree
  Vitex negundo var. bicolor (Willd.) H.J. Lam -- not accepted
  Vitex negundo var. heterophylla (Franch.) Rehder -- accepted -- Chinese chastetree, negundo chastetree
  Vitex negundo var. intermedia (C. Pei) Moldenke -- accepted -- negundo chastetree, Chinese chastetree
  Vitex negundo var. negundo L. -- accepted -- Chinese chastetree, negundo chastetree
  Vitex ovata Thunb. -- not accepted
  Vitex parviflora Juss. -- accepted -- smallflower chastetree
  Vitex rotundifolia L. f. -- accepted -- roundleaf chastetree
  Vitex trifolia L. -- accepted -- simpleleaf chastetree
  Vitex trifolia var. bicolor (Willd.) Moldenke -- accepted -- simpleleaf chastetree
  Vitex trifolia var. simplicifolia Cham. -- not accepted
  Vitex trifolia var. subtrisecta (Kuntze) Moldenke -- accepted -- simpleleaf chastetree
  Vitex trifolia var. trifolia L. -- accepted -- simpleleaf chastetree
  Vitex trifolia var. variegata Moldenke -- accepted -- varigated chastetree
  Volkameria aculeata L. -- accepted -- haggarbush
  Volkameria inermis L. -- accepted -- embrert
  Warnockia M.W. Turner -- accepted -- brazosmint
  Warnockia scutellarioides (Engelm. & A. Gray) M.W. Turner -- accepted -- prairie brazosmint
  Wulfenia bullii (Eaton) Barnhart -- not accepted
  Yeatesia Small -- accepted -- bractspike
  Yeatesia laetevirens (Buckley) Small -- not accepted
  Yeatesia platystegia (Torr.) Hilsenb. -- accepted -- Montell bractspike
  Yeatesia viridiflora (Nees) Small -- accepted -- yellow bractspike
  Ziziphora pulegioides (L.) Desf. -- not accepted
   

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