Children (13 direct children, 13 direct and indirect children):
Mammillaria heyderi subsp. macdougalii
Mammillaria heyderi subsp. heyderi
Little nipple cactus
Mammillaria heyderi subsp. hemisphaerica
Mammillaria heyderi hemisphaerica
Mammillaria heyderi subsp. gummifera
Mammillaria heyderi gummifera
Mammillaria heyderi subsp. gaumeri
Mammillaria heyderi subsp. meiacantha
Mammillaria heyderi var. bullingtoniana
Little nipple cactus
Mammillaria heyderi var. heyderi
Little nipple cactus
Mammillaria heyderi var. macdougalii
Mammillaria heyderi var. hemisphaerica
Mammillaria heyderi var. meiacantha
Mammillaria heyderi subsp. coahuilensis
Mammillaria heyderi var. applanata