Gymnocalycium riojense var. guasayanense Strigl in Gymnocalycium 4: 57. 1991
Gymnocalycium riojense var. guasayanense in Gymnocalycium 4: 57. 1991
is basionym for Gymnocalycium riojense subsp. guasayanense in Gymnocalycium 21 (Sonderausgabe): 816. 2008