| Thevetia yccotli A. DC., 1844 |
| Thevetiinae A. DC., 1844 |
| Thoreauea J.K. Williams, 2002 |
| Thoreauea aberrans J.F. Morales, 2005 |
| Thoreauea guerrerensis Diego & Lozada-Pérez, 2006 |
| Thoreauea paneroi J.K. Williams, 2002 |
| Tintinnabularia Woodson, 1936 |
| Tintinnabularia gratissima J.F. Morales, 1996 |
| Tintinnabularia mortonii Woodson, 1936 |
| Tonduzia Pittier, 1908 |
| Tonduzia longifolia (A. DC.) Markgr., 1924 |
| Tonduzia macrantha Woodson, 1937 |
| Tonduzia parvifolia Pittier, 1908 |
| Tonduzia pittieri Donn. Sm., 1910 |
| Tonduzia stenophylla (Donn. Sm.) Pittier, 1908 |
| Tonduziinae M.E. Endress, 2014 |
| Trachelospermum Lem., 1851 |
| Trachelospermum difforme (Walter) A. Gray, 1878 |
| Trachelospermum stans A. Gray, 1886 |
| Trichosacme Zucc., 1846 |