Neoporteria dubia (Backeb.) Donald & G.D.Rowley in Cact. Succ. J. Gr. Brit. 28: 56. 1966 Neoporteria dubia (Backeb.) Donald & G.D.Rowley in Cact. Succ. J. Gr. Brit. 28: 56. 1966is new combination for Pyrrhocactus dubius Backeb., Kaktus-ABC: 415. 1936 ["1935"]Taxon for this nameNeoporteria dubia (Backeb.) Donald & G.D.Rowley