Echinocactus elephantidens (Lem.) Poselg. in Allg. Gartenzeitung 21: 102. 1853 Echinocactus elephantidens (Lem.) Poselg. in Allg. Gartenzeitung 21: 102. 1853is new combination for Mammillaria elephantidens Lem., Cact. Aliq. Nov.: 1. 1838Taxon for this nameEchinocactus elephantidens (Lem.) Poselg.