Grusonia davisii (Engelm. & J.M.Bigelow) G.D.Rowley in Tephrocactus Study Group 12(3): 44. 2006 Grusonia davisii (Engelm. & J.M.Bigelow) G.D.Rowley in Tephrocactus Study Group 12(3): 44. 2006is new combination for Opuntia davisii Engelm. & J.M.Bigelow in Proc. Amer. Acad. Arts 3: 305. 1856Taxon for this nameGrusonia davisii (Engelm. & J.M.Bigelow) G.D.Rowley