| 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 |
| Triniochloa talpensis Gonz.-Led. & Gómez-Sánchez, 1995 |
| Triniusa Steud., 1854 |
| Triodia R. Br., 1810 |
| Triodia acuminata (Gray) Benth. ex Vasey, 1883 |
| Triodia albescens Vasey, 1891 |
| Triodia avenacea Kunth, 1816 |
| Triodia avenacea var. avenacea Kunth, 1816 |
| Triodia avenacea var. breviaristata Kurtz, 1893 |
| Triodia caerulescens Desv., 1831 |
| Triodia cuprea J. Jacq., 1814 |