Children (9 direct children, 9 direct and indirect children):
Melocactus curvispinus dawsonii
Melocactus curvispinus curvispinus
Melocactus curvispinus subsp. caesius
Melocactus curvispinus subsp. koolwijkianus
Melocactus curvispinus subsp. cucutensis
Melocactus curvispinus subsp. lobelii
Melocactus curvispinus subsp. loboguerreroi
Melocactus curvispinus subsp. obtusipetalus
Melocactus curvispinus subsp. saravianus