| Cymophora luckowana B.L. Turner, 1992 |
| Cymophora pringlei B.L. Rob., 1907 |
| Cynara L., 1753 |
| Cynara cardunculus L., 1753 |
| Cyrtocymura H. Rob., 1987 |
| Cyrtocymura scorpioides (Lam.) H. Rob., 1987 |
| 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 |