Echinocactus mackieanus Hook. in Bot. Mag. 64: t. 3561. 1837 Echinocactus mackieanus Hook. in Bot. Mag. 64: t. 3561. 1837is basionym for Gymnocalycium mackieanum (Hook.) Metzing, Mereg. & R.Kiesling in Allionia 33: 209. 1995Taxon for this nameEchinocactus mackieanus Hook.