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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 | Asterales
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| Family | Asteraceae
– sunflowers, tournesols |
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| Genus | Plectocephalus D. Don |
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Direct Children: |
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| Species | Plectocephalus americanus (Nutt.) D. Don
– American star-thistle | |
| Species | Plectocephalus rothrockii (Greenm.) D.J.N. Hind
– Rothrock's knapweed | |
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