Notocactus horstii F.Ritter in Succulenta (Netherlands) 45: 3. 1966
Notocactus horstii in Succulenta (Netherlands) 45: 3. 1966
is basionym for Parodia horstii in Bradleya 5: 93. 1987
is basionym for Ritterocactus horstii in Sukkulenty 3: 60. 2000
is basionym for Peronocactus horstii in Sukkulenty 2(2): 21. 1999