| Thysanachne scoparia J. Presl, 1829 |
| Tinaea Garzia, 1838 |
| Torgesia Bornm., 1913 |
| Torresia Ruiz & Pav., 1794 |
| Tosagris P. Beauv., 1812 |
| Tosagris agrostoidea P. Beauv., 1812 |
| Tozzettia Savi, 1799 |
| Tozzettia geniculata (L.) Bubani, 1901 |
| Trachynia Link, 1827 |
| Trachynia distachya (L.) Link, 1827 |
| Trachynotia Michx., 1803 |
| Trachynotia alterniflora Steud., 1841 |
| Trachynotia alternifolia (Loisel.) DC., 1815 |
| Trachynotia cynosuroides (L.) Michx., 1803 |
| Trachynotia juncea Michx., 1803 |
| Trachynotia polystachya Michx., 1803 |
| Trachypoa Bubani, 1901 |
| Trachypoa vulgaris Bubani, 1901 |
| Trachypogon Nees, 1829 |
| Trachypogon angustifolius E. Fourn. ex Hemsl., 1885 |