| Triarrhena (Maxim.) Nakai, 1950 |
| Triathera Desv., 1810 |
| Triathera americana (L.) Desv., 1810 |
| Triathera aristidoides (Kunth) Nash, 1903 |
| Triathera gracilis E. Fourn., 1886 |
| Triatherus Raf., 1818 |
| Trichachne Nees, 1829 |
| Trichachne affinis Swallen, 1963 |
| Trichachne californica (Benth.) Chase, 1933 |
| Trichachne hitchcockii (Chase) Chase, 1933 |
| Trichachne insularis (L.) Nees, 1829 |
| Trichachne nutans (L.) B.R. Baum, 1967 |
| Trichachne patens Swallen, 1932 |
| Trichachne penicilligera (Speg.) Parodi, 1939 |
| Trichachne saccharatum (Buckley) Nash, 1903 |
| Trichachne sacchariflora Nees, 1829 |
| Trichachne sellowii Müll. Hal., 1861 |
| Trichachne sericea Swallen, 1949 |
| Trichanthecium Zuloaga & Morrone, 2011 |
| Trichanthecium cyanescens (Nees ex Trin.) Zuloaga & Morrone, 2011 |