| Aristida unilateralis Willd. ex Steud., 1840 |
| Aristida vaginata Hitchc., 1935 |
| Aristida vaseyi Wooton & Standl., 1912 |
| Aristida virletii E. Fourn., 1885 |
| Aristida vulgaris Trin. & Rupr., 1842 |
| Aristida vulgaris var. canariensis (Willd.) Trin. & Rupr., 1842 |
| Aristida wrightii Nash, 1903 |
| Aristideae C.E. Hubb., 1960 |
| Aristidium (Endl.) Lindl., 1847 |
| Aristidium Endl., 1836 |
| Aristidoideae Caro, 1982 |
| Aristopsis Catasús, 1981 |
| Arrhenatherum P. Beauv., 1812 |
| Arrhenatherum americanum P. Beauv., 1812 |
| Arrhenatherum avenaceum (Scop.) P. Beauv., 1812 |
| Arrhenatherum bulbosum (Willd.) C. Presl, 1820 |
| Arrhenatherum elatius (L.) P. Beauv. ex J. Presl & C. Presl, 1819 |
| Arrhenatherum tuberosum F.W. Schultz, 1863 |
| Arrozia Schrad. & Kunth, 1833 |
| Arthratherum P. Beauv., 1812 |