Homalocephala parryi (Engelm.) Vargas & Barcenas comb. nov.

Echinocactus parryi Engelm., Proc. Amer. Acad. Arts 3: 276. 1857.

Type.

[Mexico], near Lake Santa Maria, Chihuahua, a bunch of spines collected by Dr. Parryi, s/n, apparently lost (lectotype, plate 32, figs 6-7 in Engelm., Rep. U.S. Mex. Bound., Bot. [Emory], designated by Chamberland, Syst. Bot. 22: 310. 1997).