Grusonia californica (Torr. & A.Gray) G.D.Rowley in Tephrocactus Study Group 12(3): 43. 2006 Grusonia californica (Torr. & A.Gray) G.D.Rowley in Tephrocactus Study Group 12(3): 43. 2006is new combination for Cereus californicus Torr. & A.Gray, Fl. N. Amer. 1(4): 555. 1840Taxon for this nameGrusonia californica (Torr. & A.Gray) G.D.Rowley