| Dahlia Cav., 1791 |
| Dahlia apiculata (Sherff) P.D.Sørensen, 1969 |
| Dahlia atropurpurea P.D. Sørensen, 1969 |
| Dahlia australis (Sherff) P.D. Sørensen, 1969 |
| Dahlia australis var. australis (Sherff) P.D. Sørensen, 1969 |
| Dahlia australis var. chiapensis P.D. Sørensen, 1969 |
| Dahlia australis var. liebmannii (Sherff) P.D.Sørensen, 1969 |
| Dahlia australis var. serratior (Sherff) P.D.Sørensen, 1969 |
| Dahlia barkerae Knowles & Westc., 1838 |
| Dahlia brevis P.D. Sørensen, 1969 |
| Dahlia calzadana Villaseñor & Redonda-Mart., 2018 |
| Dahlia campanulata Saar, P.D. Sørensen & Hjert., 2003 |
| Dahlia cardiophylla S.F. Blake & Sherff, 1936 |
| Dahlia coccinea Cav., 1796 |
| Dahlia congestifolia P.D. Sørensen, 1987 |
| Dahlia cordifolia (Sessé & Moc.) McVaugh, 2000 |
| Dahlia coronata Sprague, 1929 |
| Dahlia cuspidata Saar, P.D. Sørensen & Hjert., 2003 |
| Dahlia dissecta S. Watson, 1891 |
| Dahlia dissecta var. dissecta S. Watson, 1891 |