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Montana Field Guide

Montana Field Guides

Basin Brome - Bromus polyanthus

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Not Documented

Global Rank: G5
State Rank: SNA
(see State Rank Reason below)

Agency Status


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State Rank Reason (see State Rank above)
Bromus polyanthus has not been documented in Montana (Lesica et al. 2012; Postings as of October 30, 2019 on the Consortium of Pacific Northwest Herbaria [] and Rocky Mountain Herbarium [] portals). No Montana specimens have been verified (MTNHP Status Review in 2018). It occurs in portions of the central and western U.S. and intergrades with Bromus carinatus var. marginatus. There is potential for it to occur in Montana. Potential specimens should be provided to and verified at one of our State Herbaria (University of Montana, Montana State University, or Montana State University-Billings). A conservation status rank is not applicable (SNA) because this plant is not known to occur in Montana.
General Description
This is adapted from Flora of North America (Pavlick and Anderton in FNA 2007).

PLANTS: Loosely cespitose perennials; culms 60-120 cm tall, erect, glabrous or puberulent.

LEAVES: 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).

INFLORESCENCE: 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.

Diagnostic Characteristics
Potential specimens should be reported and confirmed by one of our State Herbaria:
University of Montana, Montana State University, or Montana State University-Billings

  • Literature Cited AboveLegend:   View Online Publication
    • Flora of North America Editorial Committee. 2007. Flora of North America North of Mexico. Vol. 24. Magnoliophyta: Commelinidae (in part): Poaceae, part 1. Oxford Univ. Press, New York. xxviii + 911 pp.
    • Lesica, P., M.T. Lavin, and P.F. Stickney. 2012. Manual of Montana Vascular Plants. Fort Worth, TX: BRIT Press. viii + 771 p.
  • Additional ReferencesLegend:   View Online Publication
    Do you know of a citation we're missing?
    • Lesica, P., M.T. Lavin, and P.F. Stickney. 2022. Manual of Montana Vascular Plants, Second Edition. Fort Worth, TX: BRIT Press. viii + 779 p.
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Citation for data on this website:
Basin Brome — Bromus polyanthus.  Montana Field Guide.  .  Retrieved on , from