The genus name gymnocalycium comes from the Greek for naked calyx referring to the flower buds bearing no hair or spines.
This is a very slow growing species from the grassy hillsides of Serria Grande of Cordoba, Argentina at an altitude of about 2500 feet. Generally solitary, older plant specimens may cluster from the base. The body is flattened with a green-blue or dull grey-green color reaching a width of about 3 1/2" and about 1 1/2" in height. 1, 2, or 3 spines that are stiff and bent to the body. The most characteristic vatteri form is the one with a single spine. Flowers are white with light pink throat and about 1 1/2" long. Named after Ernst Vatter of Buenos Aires.
The plant above in the collection is in a 3" pot.
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