Search Field Guide
Advanced Search
MT Gov Logo
Montana Field Guide

Montana Field Guides

Basin Brome - Bromus polyanthus

Status Under Review
Undetermined Origin

Global Rank: G5
State Rank: SU

Agency Status
MNPS Threat Rank:

External Links

General Description
Loosely cespitose perennials; culms 60-120 cm tall, erect, glabrous or puberulent. Leaf sheaths smooth or scabrous, sometimes hairy except at throat; auricles absent; ligules (1-)2-2.5 mm long, glabrous, obtuse, erose; blades 10-31 cm long, 2-9 mm wide, glabrous or scabrous (rarely hairy near collar). Panicles 10-20 cm long, open to somewhat contracted; lower branches (1)2-3 per node, erect, shorter than 10 cm long, with 1-2 spikelets variously distributed. Spikelets 20-35 mm, strongly compressed, not crowded or overlapping, florets 6-11. Lower glumes mostly 7-10 mm long, 3-veined; upper glumes mostly 9-11 mm long, 5-7 veined, shorter than the lowest lemma; lemmas 12-15 mm long, strongly compressed-keeled (at least distally), glabrous or sometimes scabrous, 7-9 veined (veins usually flush), apex entire or with acute teeth less than 1 mm long, awns 4-7 mm long; anthers 1-5 mm (adapted from: Pavlick & Anderton, 2007, Flora N. America, Vol. 24).

Range Comments
BC to northwest MT south to CA and west TX (Kartesz in prep. 2012).

Open slopes and meadows (Pavlick & Anderton, 2007, Flora N. America, Vol. 24).

Login Logout
Citation for data on this website:
Basin Brome — Bromus polyanthus.  Montana Field Guide.  .  Retrieved on , from