| Achnatherum hirticulme (S.L. Hatch, Valdés-Reyna & Morden) Valdés-Reyna & Barkworth, 2003 |
| Achnatherum hymenoides (Roem. & Schult.) Barkworth, 1993 |
| Achnatherum lobatum (Swallen) Barkworth, 1993 |
| Achnatherum multinode (Scribn. ex Beal) Valdés-Reyna & Barkworth, 2003 |
| Achnatherum parishii (Vasey) Barkworth, 1993 |
| Achnatherum parishii subsp. depauperatum (M.E. Jones) Barkworth, 1993 |
| Achnatherum parishii subsp. parishii (Vasey) Barkworth, 1993 |
| Achnatherum robustum (Vasey) Barkworth, 1993 |
| Achnatherum speciosum (Trin. & Rupr.) Barkworth, 1993 |
| Achnodon Link, 1827 |
| Achnodon Griseb., 1852 |
| Achnodonton P. Beauv., 1812 |
| Achyrodes Boehm., 1760 |
| Achyrodes aureum (L.) Kuntze, 1891 |
| Acicarpa Raddi, 1823 |
| Acicarpa sacchariflora Raddi, 1823 |
| Acratherum Link, 1827 |
| Acroceras Stapf, 1920 |
| Acroceras oryzoides Stapf, 1920 |
| Acroceras zizanioides (Kunth) Dandy, 1931 |