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Montana Field Guide

Montana Field Guides

Woolgrass - Scirpus cyperinus

Native Species

Global Rank: G5
State Rank: S3

Agency Status


External Links

General Description
Caespitose. Stems 80–120 cm, clustered on short rhizomes. Leaves: blades 2–6 mm wide; basal sheaths brown. Inflorescence open-cymose with spikelets clustered at tips of short or long peduncles. Spikelets 3–5 mm long. Scales ca. 1.5 mm long, brown; tip rounded to acute. Flowers: bristles 6, contorted, smooth, white, longer than the scales; stigmas 3. Achene 2- or 3-sided, whitish, 0.5–1 mm long (Lesica et al. 2012. Manual of Montana Vascular Plants. BRIT Press. Fort Worth, TX).

Range Comments
MB to NS south to TX, AL, FL, Mexico, disjunct and perhaps introduced in WA, OR, and Sanders County, MT (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?
    • Lesica, P., K. Lackschewitz, J. Pierce, S. Gregory and M. O'Brien. 1986. Noteworthy collections: Montana. Madrono 33:310-312.
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Citation for data on this website:
Woolgrass — Scirpus cyperinus.  Montana Field Guide.  .  Retrieved on , from