Children (7 direct children, 7 direct and indirect children):
Melocactus oreas subsp. cremnophilus
Melocactus oreas subsp. rubrisaetosus
Melocactus oreas subsp. ernestii
Melocactus oreas subsp. bahiensis
Melocactus oreas var. rubrisaetosus
Melocactus oreas var. longispinus
Melocactus oreas subsp. oreas