Pediocactus simpsonii var. knowltonii (L.D.Benson) Halda in Acta Mus. Richnov., Sect. Nat., 5(1): 13. 1998
Pediocactus simpsonii var. knowltonii in Acta Mus. Richnov., Sect. Nat., 5(1): 13. 1998
is new combination for Pediocactus knowltonii in Cact. Succ. J. (Los Angeles) 32: 193. 1960