Gymnocalycium
It is a genus of about 70 species of a small, round cacti native to South America (Argentina, Bolivia, Brazil and Paraguay). The genus name Gymnocalycium (meaning "naked calyx") is referring to their smooth flower buds bearing no hair or spines.
- Gymnocalycium albiareolatum
- Gymnocalycium angelae
- Gymnocalycium anisitsii
- Gymnocalycium baldianium - Dwarf chin
- Gymnocalycium bayrianum
- Gymnocalycium bodenbenderianum
- Gymnocalycium carminanthum
- Gymnocalycium castellanosii
- Gymnocalycium fischeri
- Gymnocalycium gibbosum
- Gymnocalycium horstii
- Gymnocalycium leeanum
- Gymnocalycium mihanovichii
- Gymnocalycium netrelianum
- Gymnocalycium obductum
- Gymnocalycium ochoterenai
- Gymnocalycium parvulum
- Gymnocalycium pflanzii
- Gymnocalycium quehlianum
- Gymnocalycium rauschii
- Gymnocalycium riojense
- Gymnocalycium rosae
- Gymnocalycium saglionis - Giant chin
- Gymnocalycium schroederianum
- Gymnocalycium spegazzinii
- Gymnocalycium stellatum
- Gymnocalycium taningaense
- Gymnocalycium uruguayense
- Gymnocalycium nova
