Bromus briziformis is an annual grass, with erect or ascending culms growing 20–80 cm (7.9–31.5 in) tall.

The leaf sheaths are shaggy and ligules, measuring 0.5–2 mm (0.020–0.079 in) long, are densely hairy.

The leaf blades are 3–13 cm (1.2–5.1 in) long and 2–4 mm (0.079–0.157 in) wide, and are lightly hairy to glabrous on both sides.

The lax and secund panicles have long spreading or drooping branches that bear solitary terminal spikelets.

It is native to southwest Eurasia, but naturalized throughout North America from New Mexico up to southern British Columbia, and scattered throughout the eastern United States.