Melocactus ferreophilus Buining & Brederoo in Krainz, Kakteen 52: CVId. 1973
Melocactus ferreophilus in Krainz, Kakteen 52: CVId. 1973
is basionym for Melocactus azureus subsp. ferreophilus in Bradleya 9: 40. 1991
Melocactus ferreophilus in Krainz, Kakteen 52: CVId. 1973