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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 | Rosales
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| Family | Rhamnaceae
– buckthorns, nerpruns |
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| Genus | Rhamnus L.
– buckthorn |
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| Species | Rhamnus rubra Greene – red buckthorn |
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Direct Children: |
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| Subspecies | Rhamnus rubra ssp. modocensis C.B. Wolf
– Modoc buckthorn | |
| Subspecies | Rhamnus rubra ssp. nevadensis (A. Nelson) C.B. Wolf
– Nevada buckthorn | |
| Subspecies | Rhamnus rubra ssp. obtusissima (Greene) C.B. Wolf
– obtuse buckthorn | |
| Subspecies | Rhamnus rubra ssp. rubra Greene
– red buckthorn | |
| Subspecies | Rhamnus rubra ssp. yosemitana C.B. Wolf
– Yosemite buckthorn | |
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