Festuca breviglumis Swallen Festuca breviglumis Swallen in Contr. U.S. Natl. Herb. 29(9): 398. 1950 sec. Dávila & al. 2018=Bromus cernuus Swallen in Bol. Soc. Bot. Méx. 23: 26-28, f. 1. 1958 syn. sec. Dávila & al. 2006