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Montana Field Guide

Montana Field Guides

Western Single-spike Sedge - Carex scirpoidea ssp. pseudoscirpoidea
Other Names:  Carex pseudoscirpoidea

Native Species

Global Rank: G5T5
State Rank: S4

Agency Status


External Links

General Description
Plants rhizomatous, dioecious. Stems 10-40 cm, shorter than leaves. Leaf blades 1.5-4 mm wide. Pistillate inflorescence: spikelets generally 1, sometimes 2, upper generally larger; spikelet bract wanting or if present then shorter than spike, sometimes leaf-like and sheathing; floral bract obtuse or with a small point, equal to or longer than the perygynium in width, ciliate or not, often minutely hairy, brown to black with wide white margin. Perygyinia 20-40 per spikelet, ascending, 2-3.5 mm long, 1-1.7 mm wide, 3-sided, faintly veined, purplish, faces minutely hairy (at least near beak), beak 0.4-0.7 mm long; fruit 1.5-2.1 mm long, 0.7-1.1 mm wide, more or less equal to length of peryginium body (Mastrogiuseppe, 1993, The Jepson Manual).

Species Range
Montana Range Range Descriptions


Range Comments
BC to MT and ID, south to CA, WY, UT, CO (Kartesz 2009).

Observations in Montana Natural Heritage Program Database
Number of Observations: 10

(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)

Rocky, seasonally wet areas.

  • Additional ReferencesLegend:   View Online Publication
    Do you know of a citation we're missing?
    • Aho, Ken Andrew. 2006. Alpine and Cliff Ecosystems in the North-Central Rocky Mountains. Ph.D. Dissertation. Bozeman, Montana: Montana State University. 343 p.
    • Lesica, P., M.T. Lavin, and P.F. Stickney. 2012. Manual of Montana Vascular Plants. Fort Worth, TX: BRIT Press. viii + 771 p.
    • 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:
Western Single-spike Sedge — Carex scirpoidea ssp. pseudoscirpoidea.  Montana Field Guide.  .  Retrieved on , from