| Tabernaemontana stenoptera (Leeuwenb.) A.O. Simões & M.E. Endress, 2010 |
| Tabernaemontana tomentosa (Greenm.) A.O. Simões & M.E. Endress, 2010 |
| Tabernaemontana venusta (J.F. Morales) A.O. Simões & M.E. Endress, 2010 |
| Tabernaemontaneae G. Don, 1838 |
| Tabernaemontaninae A. DC., 1844 |
| Talayotea L.O. Alvarado, 2021 |
| Talayotea caudata (A. Gray) L.O. Alvarado, 2021 |
| Talayotea trachyantha (Greenm.) L.O. Alvarado, 2021 |
| Tassadia Decne., 1844 |
| Tassadia obovata Decne., 1844 |
| Tassadiinae Liede & Meve, 2014 |
| Telosiphonia (Woodson) Henrickson, 1996 |
| Telosiphonia brachysiphon (Torr.) Henrickson, 1996 |
| Telosiphonia hesperia (I.M. Johnst.) Henrickson, 1996 |
| Telosiphonia hypoleuca (Benth.) Henrickson, 1996 |
| Telosiphonia lanuginosa (M. Martens & Galeotti) Henrickson, 1996 |
| Telosiphonia macrosiphon (Torr.) Henrickson, 1996 |
| Telosiphonia nacapulensis Felger & Henrickson, 1996 |
| Thenardia Kunth, 1819 |
| Thenardia chiapensis J.K. Williams, 1995 |