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Montana Field Guide

Montana Field Guides

Giant Wildrye - Elymus condensatus
Other Names:  Leymus condensatus

Non-native Species

Global Rank: G3G4
State Rank: SNA

Agency Status


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General Description
Bunchgrass. Stems 1–3 m tall, forming large patches in which may be found short rhizomes. Leaves: blades up to 30 mm wide, usually flat. Inflorescence 15–50 cm long, the rachis continuous and erect. Spikelets mostly >3 per node, about 15 mm long; glumes narrow, gradually tapering from the base to a narrow, pointed tip, about as long as or longer than the first lemma, veins not evident or with a single vein. Lemmas usually about 5 per spikelet (Lesica et al. 2012. Manual of Montana Vascular Plants. BRIT Press. Fort Worth, TX).

Range Comments
Collected in Stillwater County Western North America in BC, AB, CA (Lesica et al. 2012. Manual of Montana Vascular Plants. BRIT Press. Fort Worth, TX).

Observations in Montana Natural Heritage Program Database
Number of Observations: 4

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Relative Density



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



  • Literature Cited AboveLegend:   View Online Publication
    • 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?
    • Brey, C.W. 1998. Epidemiology of wheat curl mite (Aceria tosichella K.) and wheat streak mosaic virus on feral grass species and effect of glyphosate on wheat curl mite dispersal. Ph.D. Dissertation. Bozeman, MT: Montana State University. 136 p.
    • Carroll, M.W. 1998. Influence of a legume covercrop on volunteer wheat, the wheat curl mite, Aceria tosichella (K.) and wheat streak mosaic virus. M.Sc. Thesis. Bozeman, MT: Montana State University. 78 p.
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Citation for data on this website:
Giant Wildrye — Elymus condensatus.  Montana Field Guide.  .  Retrieved on , from