Melocactus longicarpus Buining & Brederoo in Cact. Succ. J. (Los Angeles) 46: 191. 1974
Melocactus longicarpus in Cact. Succ. J. (Los Angeles) 46: 191. 1974
is basionym for Melocactus ernestii subsp. longicarpus in Bradleya 9: 26. 1991
is basionym for Melocactus deinacanthus subsp. longicarpus in Bradleya 6: 94. 1988
Melocactus longicarpus in Cact. Succ. J. (Los Angeles) 46: 191. 1974