Grusonia spinosior (Engelm.) G.D.Rowley in Tephrocactus Study Group 12(3): 45. 2006 Grusonia spinosior (Engelm.) G.D.Rowley in Tephrocactus Study Group 12(3): 45. 2006is new combination for Opuntia whipplei var. spinosior Engelm. in Proc. Amer. Acad. Arts 3: 307. 1856Taxon for this nameGrusonia spinosior (Engelm.) G.D.Rowley