Grusonia versicolor (Engelm. ex Toumey) G.D.Rowley in Tephrocactus Study Group 12(3): 45. 2006 Grusonia versicolor (Engelm. ex Toumey) G.D.Rowley in Tephrocactus Study Group 12(3): 45. 2006is new combination for Opuntia versicolor Engelm. ex Toumey in Gard. & Forest 8: 325. 1895Taxon for this nameGrusonia versicolor (Engelm. ex Toumey) G.D.Rowley