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Family | Scientific Name | Common Name | Habitat | Distribution | Image |
Poaceae | Aristida purpurea var. fendleriana | | Rocky calcareous areas, prairies. | SD, MT, and CA south through OK, TX, NM, and AZ into Mexico. |
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Poaceae | Aristida purpurea var. longiseta | Red Three-awn | Rocky and sandy areas, eastwards adventive in disturbed areas. | MB west to BC, south to TX, CA, and Mexico; adventive eastwards. Also reported from NC, but the collection is from a Soil Conservation Service test nursery, and there is no evidence of naturalization. |
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Poaceae | Aristida purpurea var. nealleyi | Nealley's Three-awn | Rocky slopes, woodlands and scrub. | KS and CA south to TX, NM, AZ, CA, and Mexico. |
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Poaceae | Aristida purpurea var. purpurea | Purple Three-awn | Sandy or rocky soils. | KS and CA south to LA, TX, NM, AZ, CA, and Mexico. |
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Poaceae | Aristida purpurea var. wrightii | Wright's Three-awn | Calcareous soils. | OK, CO, s. UT, s. NV, and s. CA south to s. TX and Mexico. |
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