Melocactus robustispinus Buining, Brederoo & Theunissen in Succulenta (Netherlands) 56: 116–119. 1977
Melocactus robustispinus in Succulenta (Netherlands) 56: 116–119. 1977
is basionym for Melocactus zehntneri subsp. robustispinus in Bradleya 6: 98. 1988