Gymnocalycium ragonesei

Gymnocalycium ragonesei  has a very restricted range in Catamarca (and Cordoba?), Argentina. It grows at low elevation of 100 to 200(-400) meters above sea level, semi-buried at the edge of saline grasslands. The major threat for this species is illegal collection.

from The Encyclopedia of Cacti

Scientific classification

Kingdom: Plantae
Clade: Angiosperms
Clade: Eudicots
Order: Caryophyllales
Family: Cactaceae
Subfamily: Cactoideae
Genus: Gymnocalycium
Species: G. ragonesei
Binomial name: Gymnocalycium ragonesei                         – Wikipedia.