Homalocephala polycephala subsp. xeranthemoides (J.M.Coult.) Vargas & Bárcenas in PhytoKeys 111: 49. 2018
Homalocephala polycephala subsp. xeranthemoides in PhytoKeys 111: 49. 2018
is new combination for Echinocactus polycephalus var. xeranthemoides in Contr. U.S. Natl. Herb. 3: 358. 1896
Homalocephala polycephala subsp. xeranthemoides in PhytoKeys 111: 49. 2018