Children (9 direct children, 9 direct and indirect children):
Gymnocalycium gibbosum subsp. radovanii
Gymnocalycium gibbosum subsp. borthii
Gymnocalycium gibbosum subsp. ferdinandii
Gymnocalycium gibbosum subsp. gastonii
Gymnocalycium gibbosum subsp. radekii
Gymnocalycium gibbosum subsp. ferox
Gymnocalycium gibbosum var. brachypetalum
Gymnocalycium gibbosum var. nigrum
Gymnocalycium gibbosum subsp. gibbosum