Melocactus amethystinus Buining & Brederoo in Krainz, Kakteen 50-51: CVId. 1972
Melocactus amethystinus in Krainz, Kakteen 50-51: CVId. 1972
is basionym for Melocactus bahiensis subsp. amethystinus in Bradleya 9: 30. 1991
is basionym for Melocactus bahiensis f. amethystinus in Bradleya 9: 30. 1991