Pyrrhocactus aconcaguensis var. orientalis F.Ritter in Succulenta (Netherlands) 1960: 109. 1960
Pyrrhocactus aconcaguensis var. orientalis in Succulenta (Netherlands) 1960: 109. 1960
is basionym for Pyrrhocactus horridus var. orientalis, Kakteen Südamerika 3: 949. 1980
is basionym for Horridocactus aconcaguensis var. orientalis, Cactaceae 6: 3791. 1962
is basionym for Neoporteria curvispina f. orientalis in Cact. Succ. J. Gr. Brit. 28: 55. 1966