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| Kingdom | Plantae
– plantes, Planta, Vegetal, plants |
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| Subkingdom | Viridiplantae
– green plants |
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| Infrakingdom | Streptophyta
– land plants |
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| Superdivision | Embryophyta
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| Division | Tracheophyta
– vascular plants, tracheophytes |
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| Subdivision | Spermatophytina
– spermatophytes, seed plants, phanérogames |
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| Class | Magnoliopsida
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| Superorder | Caryophyllanae
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| Order | Caryophyllales
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| Family | Polygonaceae – knotweed, renouées, buckwheat |
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Direct Children: |
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| Genus | Acanthoscyphus Small
– flowery puncturebract | |
| Genus | Aconogonon (Meisn.) Rchb.
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| Genus | Antenoron Raf.
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| Genus | Antigonon Endl.
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| Genus | Aristocapsa Reveal & Hardham
– spinycape | |
| Genus | Bistorta (L.) Scopoli
– bistort | |
| Genus | Brunnichia Banks ex Gaertn.
– buckwheat vine | |
| Genus | Calligonum L.
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| Genus | Centrostegia A. Gray ex Benth.
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| Genus | Chorizanthe R. Br. ex Benth.
– spineflower | |
| Genus | Coccoloba P. Browne
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| Genus | Dedeckera Reveal & J.T. Howell
– Mary's grass, July gold | |
| Genus | Dodecahema Reveal & Hardham
– spineflower | |
| Genus | Emex Neck. ex Campd.
– threecornerjack | |
| Genus | Eriogonum Michx.
– ériogones, wild buckwheat, buckwheat | |
| Genus | Fagopyrum Mill.
– buckwheat | |
| Genus | Fallopia Adans.
– false-buckwheat | |
| Genus | Gilmania Coville
– goldencarpet | |
| Genus | Goodmania Reveal & Ertter
– spinecape | |
| Genus | Hollisteria S. Watson
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| Genus | Homalocladium (F. Muell.) L.H. Bailey
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| Genus | Johanneshowellia Reveal
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| Genus | Koenigia L.
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| Genus | Lastarriaea J. Rémy
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| Genus | Mucronea Benth.
– spineflower | |
| Genus | Muehlenbeckia Meisn.
– maidenhair vine | |
| Genus | Nemacaulis Nutt.
– cottonheads | |
| Genus | Oxyria Hill
– mountain sorrel, mountainsorrel | |
| Genus | Oxytheca Nutt.
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| Genus | Persicaria (L.) Mill.
– smartweed | |
| Genus | Polygonella Michx.
– jointweed | |
| Genus | Polygonum L.
– smartweed species, knotweed | |
| Genus | Pterostegia Fisch. & C.A. Mey.
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| Genus | Rheum L.
– rhubarb | |
| Genus | Rumex L.
– dock | |
| Genus | Sidotheca Reveal
– starry puncturebract | |
| Genus | Stenogonum Nutt.
– buckwheat | |
| Genus | Systenotheca Reveal & Hardham
– spineflower | |
| Genus | Triplaris Loefl. ex L.
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