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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 | Lilianae
– monocots, monocotyledons, monocotylédones |
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| Order | Poales
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| Family | Poaceae
– grasses, graminées |
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| Genus | Aristida L.
– threeawn, annual threeawn, perennial threeawn species, perennial threeawn |
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| Species | Aristida purpurea Nutt. – purple threeawn, purple three-awn, purple 3-awn, red threeawn |
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Direct Children: |
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| Form | Aristida purpurea f. brownii (Warnock) Allred & Valdés-Reyna
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| Variety | Aristida purpurea var. curvifolia (E. Fourn.) Allred
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| Variety | Aristida purpurea var. fendleriana (Steud.) Vasey
– Fendler threeawn, Fendler's threeawn | |
| Variety | Aristida purpurea var. longiseta (Steud.) Vasey
– Fendler threeawn, red threeawn, Fendler's threeawn, red threeawn (Fendler) | |
| Variety | Aristida purpurea var. nealleyi (Vasey) Allred
– blue threeawn | |
| Variety | Aristida purpurea var. parishii (Hitchc.) Allred
– Parish's threeawn, Parish threeawn | |
| Variety | Aristida purpurea var. perplexa Allred & Valdés-Reyna
– purple threeawn | |
| Variety | Aristida purpurea var. purpurea Nutt.
– purple threeawn | |
| Variety | Aristida purpurea var. wrightii (Nash) Allred
– Wright's threeawn, wright threeawn | |
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