Grusonia hamiltonii W.T.Marshall in Marshall & Bock, Cactaceae: 68. 1941 Grusonia hamiltonii W.T.Marshall in Marshall & Bock, Cactaceae: 68. 1941is new combination for Grusonia hamiltonii H.E.Gates ex Backeb., Cactaceae 1: 210. 1958Taxon for this nameGrusonia hamiltonii W.T.Marshall