Melocactus curvispinus subsp. dawsonii (Bravo) N.P.Taylor in Bradleya 9: 77. 1991
Melocactus curvispinus subsp. dawsonii in Bradleya 9: 77. 1991
is new combination for Melocactus dawsonii in Cact. Suc. Mex. 10: 28. 1965
Melocactus curvispinus subsp. dawsonii in Bradleya 9: 77. 1991