Montana Field Guide

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Montana Field Guides

Home - Other Field Guides
- Kingdom - Plants - Plantae
  - Division - Flowering Plants - Anthophyta
    - Class - Monocots - Monocotyledoneae
      - Order - Grasses/Sedges - Cyperales
        
        Family - Sedges - Cyperaceae
        
        Species - Straw-colored Flatsedge - Cyperus strigosus

Straw-colored Flatsedge - Cyperus strigosus

Species of Potential Concern
Native Species

Global Rank: G5
State Rank: SH
(see State Rank Reason below)
State Threat Score: Unknown
C-value: 4

Agency Status
USFWS:
USFS:
BLM:

State Rank Reason (see State Rank above)

Known in Montana from two historical collections (Flathead and Missoula Counties).

General Description

Caespitose annual to perennial. Stems ascending to erect, 10–60 cm. Leaves mainly basal, 2–10 mm wide, flat. Inflorescence of ovoid to hemispheric clusters of spikes of sessile spikelets. Spikelets cylindric, 4–10 mm long. Scales pale brown with a green midvein, 3–4 mm long, several-veined. Flowers: stamens 3; style 3-branched. Achene narrowly elliptic, dark brown, 3-sided, ca. 2 mm long (Lesica et al. 2012. Manual of Montana Vascular Plants. BRIT Press. Fort Worth, TX).

Range Comments

Flathead and Missoula counties; throughout U.S. and adjacent Canada (Lesica et al. 2012. Manual of Montana Vascular Plants. BRIT Press. Fort Worth, TX).

Observations in Montana Natural Heritage Program Database

Number of Observations: 1

(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

Stream banks; valleys (Lesica et al. 2012. Manual of Montana Vascular Plants. BRIT Press. Fort Worth, TX).

Stewardship Responsibility

References

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., 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:
Straw-colored Flatsedge — Cyperus strigosus. Montana Field Guide. Montana Natural Heritage Program. Retrieved on June 11, 2026, from https://FieldGuide.mt.gov/speciesDetail.aspx?elcode=PMCYP063D0