Erdisia quadrangularis Rauh & Backeb., Descr. Cact. Nov. 1: 12. 1957 ["1956"] Erdisia quadrangularis Rauh & Backeb., Descr. Cact. Nov. 1: 12. 1957 ["1956"]Taxon for this nameErdisia quadrangularis Rauh & Backeb.