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Montana Field Guide

Montana Field Guides

Threeway Sedge - Dulichium arundinaceum

Native Species

Global Rank: G5
State Rank: S3S4
C-value: 9


Agency Status
USFWS:
USFS:
BLM:


 

External Links






 
General Description
Rhizomatous, perennial herb. Stems terete, solitary, erect, hollow, 25–70 cm. Leaves cauline; the lower sheaths brown, bladeless; upper blades leathery, 1–12 cm × 2–8 mm. Inflorescence of axillary spikes 15–35 mm long; each composed of several spikelets. Spikelets cylindric, 10–25 mm long, of 2-ranked, overlapping, green to tan, acuminate scales 5–10 mm long. Flowers perfect, each at the base of a scale; perianth of 6 to 9 retrorsely barbed bristles 5–8 mm long; stamens 3; style 2-branched. Achene 2-sided, narrowly ellipsoid, short-stalked, 2–4 mm long (Lesica et al. 2012. Manual of Montana Vascular Plants. BRIT Press. Fort Worth, TX).

Species Range
Montana Range Range Descriptions

Native
 


Range Comments
Boreal North America south to CA, WY, TX, AL and FL (Lesica et al. 2012. Manual of Montana Vascular Plants. BRIT Press. Fort Worth, TX).

Observations in Montana Natural Heritage Program Database
Number of Observations: 26

(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
Shallow water or saturated peat of fens; valleys, lower montane (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:
Threeway Sedge — Dulichium arundinaceum.  Montana Field Guide.  .  Retrieved on , from