Dahlia sorensenii H.V. Hansen & Hjert. Dahlia sorensenii H.V. Hansen & Hjert. in Nordic J. Bot. 16(4): 454. 1997 ["1996"] sec. Carrasco-Ortíz & al. 2019=Dahlia variabilis (Willd.) Desf., Tabl. École Bot. (ed. 3): 182. 1829 syn. sec. ???