Echinocactus bicolor f. pottsii (Salm-Dyck) Voss, Vilm. Blumengärtn., ed. 3, 1: 373. 1894 Echinocactus bicolor f. pottsii (Salm-Dyck) Voss, Vilm. Blumengärtn., ed. 3, 1: 373. 1894Taxon for this nameEchinocactus bicolor f. pottsii (Salm-Dyck) Voss