Children (12 direct children, 12 direct and indirect children):
Mammillaria discolor schmollii
Mammillaria discolor ochoterenae
Mammillaria discolor discolor
Mammillaria discolor subsp. pachyrhiza
Mammillaria discolor subsp. longispina
Mammillaria discolor subsp. esperanzaensis
Mammillaria discolor var. longispina
Mammillaria discolor var. albida
Mammillaria discolor var. curvispina
Mammillaria discolor var. nitens
Mammillaria discolor var. ochoterenae
Mammillaria discolor var. schmollii