Bromus commutatus is an annual C3 grass (Waller and Lewis 1979), 30 cm to 1.2 m tall; lower sheaths finely hairy; ligules 0.1-0.2 cm.
Leaves alternate, blade 0.1-0.7 cm wide, flat, finely hairy.
Flower spikelets 1-3 per branch, 4-10 flowered, 1-1.8 cm; glumes finely hairy or minutely bristly, slightly unequal, about 0.6 cm long; lemma 0.7-1 cm long, veins faint, apical teeth to 0.2 cm, awns 0.5-1.2 cm, more-or-less straight; palea much shorter than lemma; inflorescence 4-12 cm, open, broad, branches stiff, (not drooping), mostly longer than spikelets; blooming and fruiting June-early Aug.
Wetland status: NL.
Frequency in NYC: Very infrequent.
Habitat: Disturbed sites, roadsides.