| Tridens flavus var. aristatus (Scribn. & C.R. Ball) Shinners, 1954 |
| Tridens grandiflora (Vasey) Wooton & Standl., 1912 |
| Tridens muticus (Torr.) Nash, 1903 |
| Tridens nealleyi (Vasey) Wooton & Standl., 1912 |
| Tridens pilosus (Buckley) Hitchc., 1913 |
| Tridens pulchellus (Kunth) Hitchc., 1912 |
| Tridens quinquefidus (Pursh) Roem. & Schult., 1817 |
| Tridens sesleroides Nash, 1903 |
| Tridens texanus (S. Watson) Nash, 1903 |
| Tridens veralensis Catasús, 1980 |
| Tridens verticillatus Meyen, 1834 |
| Tridens virens Nees, 1829 |
| Tridentopsis P.M. Peterson, 2014 |
| Tridentopsis mutica (Torr.) P.M. Peterson, 2014 |
| Triniochloa Hitchc., 1913 |
| Triniochloa alpestris (Kunth) Pittier, 1937 |
| Triniochloa gracilis Gómez-Sánchez & Gonz.-Led., 1998 |
| Triniochloa laxa Hitchc., 1913 |
| Triniochloa micrantha (Scribn.) Hitchc., 1913 |
| Triniochloa stipoides (Kunth) Hitchc., 1913 |