Trisetum mexicanum (Swallen) S.D. Koch Trisetum mexicanum (Swallen) S.D. Koch in Taxon 28(1-3): 233. 1979 sec. Dávila & al. 2006=Deschampsia mexicana Swallen in Bol. Soc. Bot. Méx. 23: 28-30, f. 2. 1958 syn. sec. Dávila & al. 2006