Ritterocactus ayopayanus (Cárdenas) Doweld in Sukkulenty 3: 61. 2000 Ritterocactus ayopayanus (Cárdenas) Doweld in Sukkulenty 3: 61. 2000is new combination for Parodia ayopayana Cárdenas in Cact. Succ. J. (Los Angeles) 23: 98, f. 53, 54. 1951Taxon for this nameRitterocactus ayopayanus (Cárdenas) Doweld