| Stipa neomexicana (Thurb.) Scribn., 1899 |
| Stipa oreophila Speg., 1896 |
| Stipa parishii Vasey, 1882 |
| Stipa parishii var. depauperata M.E. Jones, 1912 |
| Stipa pringlei Scribn. ex Vasey, 1892 |
| Stipa pulchra Hitchc., 1915 |
| Stipa pulchra var. cernua (Stebbins & Love) Beetle & Tofsrud, 1947 |
| Stipa robusta (Vasey) Scribn., 1897 |
| Stipa saxicola Hitchc., 1925 |
| Stipa setigera J. Presl, 1830 |
| Stipa speciosa Trin. & Rupr., 1842 |
| Stipa speciosa f. minor Speg., 1901 |
| Stipa speciosa f. speciosa Trin. & Rupr., 1842 |
| Stipa speciosa var. minor Vasey, 1892 |
| Stipa speciosa var. speciosa Trin. & Rupr., 1842 |
| Stipa spicata L. f., 1781 |
| Stipa subulata E. Fourn., 1885 |
| Stipa tehuelches Speg., 1925 |
| Stipa tenuis Willd. ex Steud., 1841 |
| Stipa tenuissima Trin., 1836 |