Pediocactus robustior (J.M.Coult.) Arp in Cact. Succ. J. (Los Angeles) 44(5): 222. 1972
Pediocactus robustior in Cact. Succ. J. (Los Angeles) 44(5): 222. 1972
is new combination for Echinocactus simpsonii var. robustior in Contr. U.S. Natl. Herb. 3: 377. 1896