Notocactus glaucinus var. gracilis F.Ritter, Kakteen Südamerika 1: 168. 1979
Notocactus glaucinus var. gracilis, Kakteen Südamerika 1: 168. 1979
is basionym for Parodia oxycostata subsp. gracilis in Cactaceae Consensus Init. 6: 12. 1998
is basionym for Peronocactus oxycostatus subsp. gracilis in Sukkulenty 2(2): 21. 1999
is basionym for Notocactus oxycostatus subsp. gracilis in Sukkulenty 3: 54. 2000