Tephrocactus silvestris (Backeb.) Backeb., Kaktus-ABC: 109, 410. 1936 ["1935"] Tephrocactus silvestris (Backeb.) Backeb., Kaktus-ABC: 109, 410. 1936 ["1935"]is new combination for Opuntia silvestris Backeb. in Cact. J. (Croydon) 1: 7. 1932Taxon for this nameTephrocactus silvestris (Backeb.) Backeb.