Homalocephala polycephala subsp. xeranthemoides (J.M. Coult.) Vargas & Barcenas, 2018

Vargas-Luna, Mario Daniel, Hernandez-Ledesma, Patricia, Majure, Lucas Charles, uente-Martinez, Raul, cias, Hector Manuel Hernandez M & una, Rolando Tenoch Barcenas, 2018, Splitting Echinocactus: morphological and molecular evidence support the recognition of Homalocephala as a distinct genus in the Cacteae, PhytoKeys 111, pp. 31-59 : 47-48

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