Pediocactus knuthianus (Boed.) Halda in Acta Mus. Richnov., Sect. Nat., 5: 18. 1998
Pediocactus knuthianus in Acta Mus. Richnov., Sect. Nat., 5: 18. 1998
is new combination for Echinocactus knuthianus in Monatsschr. Deutsch. Kakteen-Ges. 2: 139. 1930