Bouteloua chihuahuana (M.C. Johnst.) Columbus Bouteloua chihuahuana (M.C. Johnst.) Columbus in Aliso 14(3): 227. 1996 sec. Dávila & al. 2018≡Bouteloua rigidiseta var. chihuahuana M.C. Johnst. in SouthW. Naturalist 27(1): 29. 1982 syn. sec. Dávila & al. 2006