Hordeum arizonicum Covas Hordeum arizonicum Covas in Madroño 10(1): 16-17, pl. 2, f. 11. 1949 sec. Dávila & al. 2018=Critesion arizonicum (Covas) Á. Löve in Taxon 29(1): 166. 1980 syn. sec. Dávila & al. 2006