Dahlia merckii Lehm. Dahlia merckii Lehm., Del. Sem. Hort. Hamburg. 1839: 4. 1839 sec. Carrasco-Ortíz & al. 2019≡Dahlia scapigera f. merckii (Lehm.) Sherff, Amer. J. Bot. 34: 141. 1947 syn. sec. Carrasco-Ortíz & al. 2019