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Montana Field Guide

Montana Field Guides

Ditch reedgrass - Calamagrostis scopulorum

Status Under Review
Native Species

Global Rank: G5
State Rank: SU

Agency Status
MNPS Threat Rank:
C-value: 4

External Links

General Description
Rhizomatous bunchgrass. Stems 50–80 cm. Leaves: blades 5–7 mm wide. Inflorescence a contracted panicle 6–12 cm long. Spikelets 6–7 mm long. Lemma with a slender straight awn not surpassing the lemma tip, callus hairs >1/2 as long as the lemma (Lavin in Lesica 2012. Manual of Montana Vascular Plants. BRIT Press. Fort Worth, TX).

Range Comments
Throughout the Rocky Mountain states in the U.S. (Lavin in Lesica 2012. Manual of Montana Vascular Plants. BRIT Press. Fort Worth, TX).

Observations in Montana Natural Heritage Program Database
Number of Observations: 12

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



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


  • Additional ReferencesLegend:   View Online Publication
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    • Lesica, P., M.T. Lavin, and P.F. Stickney. 2012. Manual of Montana Vascular Plants. Fort Worth, TX: BRIT Press. viii + 771 p.
    • Martin, S.A. 1985. Ecology of the Rock Creek bighorn sheep herd, Beartooth Mountains, Montana. M.Sc. Thesis. Bozeman, MT: Montana State University. 152 p.
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Citation for data on this website:
Ditch reedgrass — Calamagrostis scopulorum.  Montana Field Guide.  .  Retrieved on , from