Gymnocalycium, commonly called chin cactus, is a genus of about 70 South American species of cacti.

Gymnocalycium mihanovichii, often called chin cactus, is a species of cactus from South America commonly grown as a houseplant.

Gymnocalycium quehlianum (Quehla chin cactus) is a species of flowering plant in the family Cactaceae, native to northern Argentina.

Even the best grafts only last a few years, as the base grows faster than the Gymnocalycium.

The genus name Gymnocalycium (from Greek, "naked calyx") refers to the flower buds bearing no hair or spines.

Principal genera are Echinocactus, Ferocactus, Gymnocalycium, and Parodia.

Gymnocalycium quehlianum (Quehla chin cactus) is a species of flowering plant in the family Cactaceae, native to northern Argentina.

Of particular interest are the Gymnocalycium, Mamillaria, and Rhipsalis; Alluaudia, Aloe, and Kalanchoe from South Africa and Madagascar; and notable specimens of Welwitschia mirabilis from the South African desert.

"Cactarium" greenhouse collections include: cacti and succulents, with caudiciform species exhibiting thickened root crowns, many species of Asclepiads, Aztecia, Gymnocalycium, Alstromeria, Euphorbia, and Ferocactus, plus two fine examples of Welwitschia mirabilis from Namibian deserts.