Echinocactus sellowii f. tetracanthus (Lem.) Schelle, Handb. Kakteenkult.: 143. 1907 Echinocactus sellowii f. tetracanthus (Lem.) Schelle, Handb. Kakteenkult.: 143. 1907is new combination for Echinocactus tetracanthus Lem., Cact. Aliq. Nov.: 15. 1838Taxon for this nameEchinocactus sellowii f. tetracanthus (Lem.) Schelle