| Dahlia coccinea Cav. | | a | | Dahlia coccinea Cav. | | 13142 | |
| Dahlia excelsa Benth. | | a | | Dahlia excelsa Benth. | | 13143 | |
| Dahlia gracilis Ortgies | Dahlia coccinea Cav. | | | Dahlia gracilis Ortgies | Dahlia coccinea Cav. | 13144 | 13142 |
| Dahlia imperialis Roezl ex Ortgies | | a | | Dahlia imperialis Roezl ex Ortgies | | 13145 | |
| Dahlia maximiliana hort. ex Hook. f. | Dahlia imperialis Roezl ex Ortgies | | | Dahlia maximiliana hort. ex Hook. f. | Dahlia imperialis Roezl ex Ortgies | 13146 | 13145 |
| Dahlia maxonii Saff. | Dahlia imperialis Roezl ex Ortgies | | | Dahlia maxonii Saff. | Dahlia imperialis Roezl ex Ortgies | 13147 | 13145 |
| Dahlia merckii Lehm. | | a | | Dahlia merckii Lehm. | | 13148 | |
| Dahlia pinnata Cav. | | a | | Dahlia pinnata Cav. | | 13149 | |
| Dahlia popenovii Saff. | Dahlia coccinea Cav. | | | Dahlia popenovii Saff. | Dahlia coccinea Cav. | 13150 | 13142 |
| Dahlia rosea Cav. | Dahlia pinnata Cav. | | | Dahlia rosea Cav. | Dahlia pinnata Cav. | 13151 | 13149 |
| Dahlia scapigera (A. Dietr.) Knowles & Westc. | | a | | Dahlia scapigera (A. Dietr.) Knowles & Westc. | | 13152 | |
| Dahlia variabilis (Willd.) Desf. | Dahlia pinnata Cav. | | | Dahlia variabilis (Willd.) Desf. | Dahlia pinnata Cav. | 13153 | 13149 |
| Dahlia spp. | | a | | Dahlia spp. | | 300170 | |
| Dahlia pinnata auct. nonn. | Dahlia sorensenii H. V. Hansen & Hjert. | | | Dahlia pinnata auct. nonn. | Dahlia sorensenii H. V. Hansen & Hjert. | 404565 | 464629 |
| Dahlia sorensenii H. V. Hansen & Hjert. | | a | | Dahlia sorensenii H. V. Hansen & Hjert. | | 464629 | |
| Dahlia ×hortensis Guillaumin | Dahlia pinnata Cav. | | | Dahlia hortensis Guillaumin | Dahlia pinnata Cav. | 464648 | 13149 |
| Dahlia rupicola P. D. Sørensen | | a | | Dahlia rupicola P. D. Sørensen | | 476726 | |
| Dahlia dissecta S. Watson | | a | | Dahlia dissecta S. Watson | | 476727 | |
| Dahlia ×hybrida hort., nom. inval. | Dahlia pinnata Cav. | | | Dahlia hybrida hort., nom. inval. | Dahlia pinnata Cav. | 480673 | 13149 |