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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 | Lamiales
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| Family | Plantaginaceae
– plantains |
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| Genus | Penstemon Schmidel
– penstémons, beardtongue |
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| Species | Penstemon linarioides A. Gray – creeping penstemon, toadflax penstemon |
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Direct Children: |
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| Subspecies | Penstemon linarioides ssp. coloradoensis (A. Nelson) D.D. Keck
– toadflax penstemon, Colorado penstemon | |
| Subspecies | Penstemon linarioides ssp. linarioides A. Gray
– toadflax penstemon, toadflax beardtongue | |
| Subspecies | Penstemon linarioides ssp. maguirei D.D. Keck
– Maguire's penstemon | |
| Subspecies | Penstemon linarioides ssp. sileri (A. Gray) D.D. Keck
– Siler's penstemon | |
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