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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 | Asteranae
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| Order | Gentianales
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| Family | Gentianaceae
– gentians, gentianes |
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| Genus | Bartonia Muhl. ex Willd. – screwstem |
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Direct Children: |
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| Species | Bartonia paniculata (Michx.) Muhl.
– twining screwstem | |
| Species | Bartonia texana Correll
– Texas screwstem | |
| Species | Bartonia verna (Michx.) Raf. ex Barton
– white screwstem | |
| Species | Bartonia virginica (L.) Britton, Sterns & Poggenb.
– yellow screwstem, bartonie de Virginie | |
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