| Acanthaceae Juss., 1789 |
| Acantheae Dumort., 1829 |
| Acanthoideae Eaton, 1836 |
| Acanthus L., 1753 |
| Acanthus mollis L., 1753 |
| Adhatoda Mill., 1754 |
| Adhatoda candicans Nees, 1847 |
| Adhatoda dipteracantha Nees, 1847 |
| Adhatoda furcata (Jacq.) Nees, 1847 |
| Adhatoda furcata var. terminalis Nees, 1847 |
| Adhatoda longiflora Torr., 1858 |
| Adhatoda pacifica Oerst., 1855 |
| Anisacanthus Nees, 1842 |
| Anisacanthus abditus Brandegee, 1893 |
| Anisacanthus andersonii T.F. Daniel, 1982 |
| Anisacanthus glaberrimus M.E. Jones, 1929 |
| Anisacanthus gonzalezii Greenm., 1903 |
| Anisacanthus insignis A. Gray, 1886 |
| Anisacanthus insignis var. linearis S.H. Hagen, 1941 |
| Anisacanthus junceus (Torr.) Hemsl., 1882 |