| Aristida eggersii Hitchc., 1924 |
| Aristida elegans Rudge, 1805 |
| Aristida elliotiana Steud., 1855 |
| Aristida eludens Allred & Valdés-Reyna, 1995 |
| Aristida escova Vasey ex Beal, 1896 |
| Aristida fasciculata Torr., 1824 |
| Aristida fasciculata var. californica (Vasey) Vasey ex L.H. Dewey, 1894 |
| Aristida fasciculata var. fendleriana (Steud.) Vasey ex L.H. Dewey, 1894 |
| Aristida fasciculata var. hookeri (Trin. & Rupr.) L.H. Dewey, 1894 |
| Aristida fasciculata var. micrantha (Vasey) Vasey ex L.H. Dewey, 1894 |
| Aristida fasciculata var. nuttallii Thurb. ex Beal, 1896 |
| Aristida fendleriana Steud., 1855 |
| Aristida festucoides Steud. & Hochst., 1845 |
| Aristida filipendula Buckley, 1862 |
| Aristida flexuosa E. Fourn., 1885 |
| Aristida floridana (Chapm.) Vasey, 1885 |
| Aristida fournieriana Hitchc., 1935 |
| Aristida fugitiva Vasey ex S. Watson, 1889 |
| Aristida furcata P. Beauv., 1812 |
| Aristida geminiflora E. Fourn., 1886 |