| Taravalia aptera (Parry) Greene, 1906 |
| Thamnosma Torr. & Frém., 1845 |
| Thamnosma montanum Torr. & Frém., 1845 |
| Thamnosma pailensis M.C. Johnst., 1983 |
| Thamnosma stanfordii I.M. Johnst., 1943 |
| Thamnosma texana (A. Gray) Torr., 1859 |
| Thamnosma trifoliatum I.M. Johnst., 1924 |
| Toxosiphon Baill., 1872 |
| Toxosiphon lindenii (Planch.) Baill., 1872 |
| Triphasia Lour., 1790 |
| Triphasia trifolia (Burm. f.) P. Wilson, 1909 |
| Zanthoxylum L., 1753 |
| Zanthoxylum acreanum (K. Krause) J.F. Macbr., 1949 |
| Zanthoxylum acuminatum (Sw.) Sw., 1797 |
| Zanthoxylum acuminatum subsp. juniperinum (Poepp.) Reynel, 2015 |
| Zanthoxylum affine Kunth, 1823 |
| Zanthoxylum aguilarii Standl. & Steyerm., 1940 |
| Zanthoxylum arborescens Rose, 1897 |
| Zanthoxylum atoyacanum Lundell, 1938 |
| Zanthoxylum belizense Lundell, 1941 |