Homalocephala polycephala subsp. xeranthemoides (J.M. Coult.) Vargas & Barcenas comb. nov.

Echinocactus polycephalus Engelm. & J.M. Bigelow var. xeranthemoides J.M. Coult. in Contr. U.S. Natl. Herb. 3(7): 358. 1896 [1 Apr 1896].

Type.

U.S. A., Arizona, near the Rio Colorado, Siler s/n., Nov., 1881 (lectotype, designated by Benson, Cacti U. S. Canada, 951. 1982: MO 106798 [excluding packet labeled "Siler, 1882"]).

Key to genera of HEA clade

Key to species of Astrophytum

Key to species of Homalocephala

Key to species of Echinocactus