Efossus heteracanthus (Muehlenpf.) Orcutt in Cactography 5. 1926 Efossus heteracanthus (Muehlenpf.) Orcutt in Cactography 5. 1926is new combination for Echinocactus heteracanthus Muehlenpf. in Allg. Gartenzeitung 13: 345. 1845Taxon for this nameEfossus heteracanthus (Muehlenpf.) Orcutt