Melocactus krainzianus Buining & Brederoo in Krainz, Kakteen 62: CVId. 1975
Melocactus krainzianus in Krainz, Kakteen 62: CVId. 1975
is basionym for Melocactus azureus var. krainzianus in Bradleya 6: 94. 1988
is basionym for Melocactus azureus subsp. krainzianus in Cactology 5 (Suppl. 8): 2. 2020