Gymnocalycium uruguayense MM 196 *
Brazil: 8km North-East of Quarai towards Passo from Guarda, Rio Grande do Sul
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* Gymnocalycium uruguayense (Arechavaleta) Britton & Rose 1922 = Gymnocalycium hyptiacanthum subsp. uruguayense (Arechavaleta) Meregalli 2007 = Gymnocalycium hyptiacanthum ssp. uruguayense sensu Kiesling and Charles