Malacocarpus sellowianus var. tetracanthus (Lem.) Salm-Dyck, Cact. Hort. Dyck., ed. 1849: 25. 1850
Malacocarpus sellowianus var. tetracanthus, Cact. Hort. Dyck., ed. 1849: 25. 1850
is new combination for Echinocactus tetracanthus, Cact. Aliq. Nov.: 15. 1838