Pyrrhocactus engleri (F.Ritter) F.Ritter in Succulenta (Netherlands) 1959: 131. 1959 Pyrrhocactus engleri (F.Ritter) F.Ritter in Succulenta (Netherlands) 1959: 131. 1959is new combination for Horridocactus engleri F.Ritter in Succulenta (Netherlands) 1959: 76. 1959Taxon for this namePyrrhocactus engleri (F.Ritter) F.Ritter