Subspecies, varieties, forms and cultivars of plants belonging to the Gymnocalycium ragonesei group

• Gymnocalycium obductum Piltz
• Gymnocalycium ragonesei A.Cast.: has flattened globose, almost disk shaped brown stems. Spines 5-6 short, hairlike, to 3 mm long, spidery, flattened against stem. Distribution: Catamarca, Argentina
• Gymnocalycium ragonesei f. cristatum hort.: crested form.
• Gymnocalycium ragonesei f. rubra hort.: Mutant lacking chlorophyll pigment. The result is a completely red or purple plant.
• Gymnocalycium stellatum var. minimum (Pazout) R.Strong: has very small grayish-brown or olive-green flattened stems with a swollen tap root. Spines short flexible, brown to grey. Distribution: Córdoba, Argentina.