Melocactus zehntneri subsp. robustispinus (Buining & Brederoo) P.J.Braun in Bradleya 6: 98. 1988
Melocactus zehntneri subsp. robustispinus in Bradleya 6: 98. 1988
is new combination for Melocactus robustispinus in Succulenta (Netherlands) 56: 116–119. 1977