Thelocactus leucacanthus var. porrectus (Lem.) Backeb., Cactaceae 5: 2818. 1961 Thelocactus leucacanthus var. porrectus (Lem.) Backeb., Cactaceae 5: 2818. 1961is new combination for Echinocactus porrectus Lem., Cact. Aliq. Nov.: 17. 1838Taxon for this nameThelocactus leucacanthus var. porrectus (Lem.) Backeb.