Children (8 direct children, 8 direct and indirect children):
Gymnocalycium castellanosii subsp. acorrugatum
Gymnocalycium castellanosii subsp. armillatum
Gymnocalycium castellanosii subsp. bozsingianum
Gymnocalycium castellanosii var. rigidum
Gymnocalycium castellanosii subsp. ferocior
Gymnocalycium castellanosii subsp. ferocius
Gymnocalycium castellanosii var. armillatum
Gymnocalycium castellanosii var. bozsingianum
Gymnocalycium castellanosii subsp. castellanosii