Pyrrhocactus vollianus Backeb., Descr. Cact. Nov. 1: 31. 1957 ["1956"] Pyrrhocactus vollianus Backeb., Descr. Cact. Nov. 1: 31. 1957 ["1956"]is basionym for Neoporteria volliana (Backeb.) Donald & G.D.Rowley in Cact. Succ. J. Gr. Brit. 28: 58. 1966Taxon for this namePyrrhocactus vollianus Backeb.