Children (9 direct children, 9 direct and indirect children):
Mammillaria prolifera prolifera
Mammillaria prolifera subsp. prolifera
Mammillaria prolifera var. texana
Texas nipple cactus
Mammillaria prolifera arachnoidea
Mammillaria prolifera zublerae
Mammillaria prolifera multiceps
Mammillaria prolifera subsp. haitiensis
Mammillaria prolifera subsp. texana
Mammillaria prolifera var. arachnoidea
Mammillaria prolifera var. multiceps