Horridocactus crispus (F.Ritter) Backeb., Cactaceae 6: 3795. 1962 Horridocactus crispus (F.Ritter) Backeb., Cactaceae 6: 3795. 1962is new combination for Pyrrhocactus crispus F.Ritter in Succulenta (Netherlands) 1959: 137. 1959Taxon for this nameHorridocactus crispus (F.Ritter) Backeb.