Tephrocactus pseudoudonis Rauh & Backeb., Descr. Cact. Nov. 1: 7. 1957 ["1956"] Tephrocactus pseudoudonis Rauh & Backeb., Descr. Cact. Nov. 1: 7. 1957 ["1956"]is basionym for Opuntia pseudoudonis (Rauh & Backeb.) G.D.Rowley in Natl. Cact. Succ. J. 13: 6. 1958Taxon for this nameTephrocactus pseudoudonis Rauh & Backeb.