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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 | Polypodiophytina
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| Class | Polypodiopsida
– leptosporangiate ferns |
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| Subclass | Polypodiidae
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| Order | Polypodiales
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| Suborder | Pteridineae
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| Family | Pteridaceae
– maidenhair ferns |
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| Subfamily | Cheilanthoideae Horvat
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| Genus | Pellaea Link
– cliff-brake, cliffbrake |
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| Species | Pellaea glabella Mett. ex Kuhn – smooth cliff-brake, pelléade glabre, dwarf cliffbrake, smooth cliffbrake |
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Direct Children: |
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| Subspecies | Pellaea glabella ssp. glabella Mett. ex Kuhn
– smooth cliffbrake | |
| Subspecies | Pellaea glabella ssp. missouriensis (Gastony) Windham
– Missouri cliffbrake | |
| Subspecies | Pellaea glabella ssp. occidentalis (E.E. Nelson) Windham
– western dwarf cliffbrake, smooth cliffbrake | |
| Subspecies | Pellaea glabella ssp. simplex (Butters) Á. Löve & D. Löve
– smooth cliffbrake | |
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