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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 | Rosanae
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| Order | Malpighiales
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| Family | Salicaceae
– willows, saules |
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| Genus | Populus L. – cottonwood |
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Direct Children: |
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| Species | Populus X acuminata Rydb. (pro sp.)
– lanceleaf cottonwood | |
| Species | Populus alba L.
– white poplar | |
| Species | Populus angustifolia E. James
– narrowleaf cottonwood | |
| Species | Populus balsamifera L.
– balsam poplar | |
| Species | Populus X berolinensis (K. Koch) Dippel
– poplar | |
| Species | Populus X brayshawii B. Boivin
– hybrid balsam poplar | |
| Species | Populus X canadensis Moench (pro sp.)
– Carolina poplar, Canadian poplar | |
| Species | Populus X canescens (Aiton) Sm. (pro sp.)
– gray poplar | |
| Species | Populus deltoides W. Bartram ex Marshall
– plains cottonwood, common cottonwood, eastern cottonwood | |
| Species | Populus fremontii S. Watson
– cottonwood, Fremont's cottonwood | |
| Species | Populus X generosa Henry
– balm-of-Gilead | |
| Species | Populus grandidentata Michx.
– bigtooth aspen | |
| Species | Populus X hastata Dode (pro sp.)
– black cottonwood | |
| Species | Populus X heimburgeri B. Boivin
– Heimburger's poplar | |
| Species | Populus heterophylla L.
– swamp cottonwood | |
| Species | Populus X hinckleyana Correll (pro sp.)
– Hinckley's poplar | |
| Species | Populus X inopina Eckenw.
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| Species | Populus X jackii Sarg.
– balm-of-Gilead | |
| Species | Populus maximowiczii A. Henry
– Japanese poplar | |
| Species | Populus nigra L.
– black cottonwood, black poplar, Lombardy's poplar | |
| Species | Populus X parryi Sarg.
– Parry's poplar, Parry's cottonwood | |
| Species | Populus X petrowskiana R.I. Schröd. ex Regel
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| Species | Populus X rollandii Rouleau
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| Species | Populus X rouleauiana B. Boivin
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| Species | Populus simonii Carrière
– Chinese cottonwood, Simon poplar | |
| Species | Populus X smithii B. Boivin
– Smith's poplar | |
| Species | Populus X tomentosa Carrière (pro sp.)
– Chinese white poplar | |
| Species | Populus tremula L.
– European aspen | |
| Species | Populus tremuloides Michx.
– quaking aspen | |
| Species | Populus trichocarpa Torr. & A. Gray ex Hook.
– black cottonwood | |
| Species | Populus tristis Fisch.
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