Children (5 direct children, 5 direct and indirect children):
Gymnocalycium hyptiacanthum subsp. hyptiacanthum
Gymnocalycium hyptiacanthum subsp. netrelianum
Gymnocalycium hyptiacanthum subsp. uruguayense
Gymnocalycium hyptiacanthum subsp. paucicostatum
Gymnocalycium hyptiacanthum subsp. schroederianum