Gymnocalycium zegarrae subsp. riograndense (Cárdenas) H.Till & Amerh. in Gymnocalycium 13: 353. 2000
Gymnocalycium zegarrae subsp. riograndense in Gymnocalycium 13: 353. 2000
is new combination for Gymnocalycium riograndense in Kakteen And. Sukk. 9(2): 24. 1958