| Aristida purpurea var. hookeri Trin. & Rupr., 1842 |
| Aristida purpurea var. laxiflora Merr., 1901 |
| Aristida purpurea var. longiseta (Steud.) Vasey, 1878 |
| Aristida purpurea var. micrantha Vasey, 1892 |
| Aristida purpurea var. nealleyi (Vasey) Allred, 1984 |
| Aristida purpurea var. parishii (Hitchc.) Allred, 1984 |
| Aristida purpurea var. perplexa Allred & Valdés-Reyna, 1995 |
| Aristida purpurea var. purpurea Nutt., 1837 |
| Aristida purpurea var. robusta (Merr.) A.H. Holmgren & N.H. Holmgren, 1977 |
| Aristida purpurea var. wrightii (Nash) Allred, 1984 |
| Aristida purpusiana Hitchc., 1913 |
| Aristida racemosa Muhl., 1817 |
| Aristida rariflora (Hitchc.) Henrard, 1927 |
| Aristida recurvata Kunth, 1816 |
| Aristida reverchonii Vasey, 1886 |
| Aristida reverchonii var. angusta Vasey, 1892 |
| Aristida roemeriana Scheele, 1849 |
| Aristida sanctae-luciae Trin., 1826 |
| Aristida scabra (Kunth) Kunth, 1829 |
| Aristida schaffneri E. Fourn., 1885 |