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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 | Rosaceae
– roses |
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| Genus | Petrophytum (Nutt. ex Torr. & A. Gray) Rydb. – rockspirea |
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Direct Children: |
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| Species | Petrophytum caespitosum (Nutt.) Rydb.
– mat rockspirea | |
| Species | Petrophytum cinerascens (Piper) Rydb.
– halfshrub rockmat, chelan rockmat | |
| Species | Petrophytum hendersonii (Canby) Rydb.
– Olympic Mountain rockmat | |
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