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General: Grass Family (Poaceae). Mountain brome is a short-lived, perennial, cool season C-3 type bunch grass native to the mountain and intermountain regions of Western North America.

Plants develop from a shallow, non-rhizomatous root system. Culms are tall, usually 0.5 to 1.0 meters (20 to 40 inches), but sometimes reaching 1.5 meters (60 inches). Leaves are flat and broad, 4 to 10 mm wide (0.15 to 0.4 inches), mostly soft hairy, especially around the sheath, but can be glabrous or scabrous. Auricles are absent or much reduced, and the ligule is membranous, from 1 to 4 mm (0.05 to 0.15 inches) long.

The inflorescence is a loosely contracted, nodding panicle reaching 10 to 30 cm (4 to 12 inches) long. Spikelets are 5 to 10 flowered, 20 to 40 mm (0.8 to 1.6 inches) long; the glumes lanceolate, strongly keeled. The first glume is 7 to 11 mm (0.3 to 0.45 inches) long with 3 to 5 nerves. The second glume is larger, 9 to 13 mm (0.35 to 0.5 inches) long and 5 to 7 nerved. Lemmas are long, 11 to 15 mm (0.45 to 0.6 inches), keeled with the apex slightly bifid to entire with awns 4 to 6 mm (0.15 to 0.25 inches) long.


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USDA NRCS Idaho State Office

Source: USDA NRCS PLANTS Database

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