Plants perennial; not rhizomatous. Culms 50-100 cm, erect or spreading; nodes 5-7, pilose or pubescent; internodes glabrous. Basal
sheaths pubescent or pilose, throats pilose; upper sheaths pubescent or glabrous, midrib of the culm leaves not
abruptly narrowed just below the collar; auricles
absent; ligules 1-2 mm, glabrous,
truncate or obtuse; blades 20-30 cm
long, (4)7-11 mm wide, flat, both surfaces pilose or the abaxial surface
glabrous. Panicles 10-20 cm, open,
nodding; branches ascending or
spreading. Spikelets 20-30 mm,
elliptic to lanceolate, terete to moderately laterally compressed, with 5-10
florets. Glumes usually pilose or
pubescent, rarely glabrous; lower glumes
6-8 mm, 1-veined; upper glumes 8-8.5
mm, 3-veined, mucronate; lemmas
10-12 mm, elliptic to lanceolate, rounded over the midvein, backs and margins
pilose or pubescent, apices acute to obtuse, entire; awns 3-5 mm, straight, arising less than 1.5 mm below the lemma
apices; anthers 1.5-3 mm. 2n = 28.
Bromus mucroglumis grows at 1500-3000 m in the southwestern United
States and northern Mexico.