Gymnocalycium stellatum var. zanthnerianum - 3km, N.San Pedro Norte (most northernly location)

Gymnocalycium stuckertii.

Gymnocalycium taningaense. Collected Taninga/Cordoba, Argentina. HV1241a

Gymnocalycium tilcarense

Gymnocalycium tillianum.  Mutquin /Catamarca, Argentina

Gymnocalycium triacanthum - Collected: Icano / Catamarca Argentina. HV1719

Gymnocalycium uruguayense

Gymnocalycium valnicekianum

Gymnocalycium vatteri var. altautinense  - Type from Vindplaats / Altautina / Cordoba. HV 669

Gymnocalycium venturianum

Gymnocalycium venturianun

Gymnocalycium zegarrae. Rounded tubercles, bell shaped flowers. Puente Arce / Cochabamba/Bolivia - HV/B 046