Pediocactus simpsonii var. robustior (J.M.Coult.) L.D.Benson in Cact. Succ. J. (Los Angeles) 34(1): 19. 1962
Pediocactus simpsonii var. robustior in Cact. Succ. J. (Los Angeles) 34(1): 19. 1962
is new combination for Echinocactus simpsonii var. robustior in Contr. U.S. Natl. Herb. 3: 377. 1896