Gymnocalycium castellanosii var. rigidum Gymnocalycium castellanosii subsp. armillatum Gymnocalycium bozsingianum Gymnocalycium castellanosii var. armillatum Gymnocalycium castellanosii var. bozsingianum Gymnocalycium castellanosii var. spinosior Gymnocalycium castellanosii subsp. bozsingianum
World Flora Online, accessed June 20, 2024