Horridocactus aconcaguensis var. orientalis (F.Ritter) Backeb., Cactaceae 6: 3791. 1962
Horridocactus aconcaguensis var. orientalis, Cactaceae 6: 3791. 1962
is new combination for Pyrrhocactus aconcaguensis var. orientalis in Succulenta (Netherlands) 1960: 109. 1960