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Montana Field Guide

Montana Field Guides

Quackgrass - Elymus repens
Other Names:  Elytrigia repens, Agropyron repens

Exotic Species (not native to Montana)

Global Rank: GNR
State Rank: SNA

Agency Status
USFWS:
USFS:
BLM:
MNPS Threat Rank:
C-value: 0

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General Description
Rhizomatous. Stems slender, 0.7–1.1 m. Leaves: blades 4–11 mm wide, flat, lax to ascending, sheaths often with retrorse soft hairs. Inflorescence 5–13 cm long, rachis continuous, slender, the internodes <10 mm long. Spikelets 9–16 mm long, appressed to the rachis, florets 3 to 7 per spikelet, glumes shorter than florets, tapering to an awn tip. Lemmas tapering to an awn-tip (rarely unawned) or with an awn usually about 5 (–10) mm long (Lavin in Lesica 2012. Manual of Montana Vascular Plants. BRIT Press. Fort Worth, TX).

Species Range
Unknown/Undetermined
 


Range Comments
Introduced throughout N. America excepting the very southeast (Lavin in Lesica 2012. Manual of Montana Vascular Plants. BRIT Press. Fort Worth, TX).

Summary of Observations Submitted for Montana
Number of Observations: 37

(Click on the following maps and charts to see full sized version) Map Help and Descriptions
Relative Density

Recency

 

(Observations spanning multiple months or years are excluded from time charts)



Habitat
Moist disturbed settings especially around lawns, in gardens, along roadsides, and riparian areas from lower to middle elevations (Lavin in Lesica 2012. Manual of Montana Vascular Plants. BRIT Press. Fort Worth, TX).

References
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Citation for data on this website:
Quackgrass — Elymus repens.  Montana Field Guide.  .  Retrieved on , from