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Montana Field Guide

Montana Field Guides

Threeway Sedge - Dulichium arundinaceum


Global Rank: G5
State Rank: S3S4

Agency Status
USFWS:
USFS:
BLM:
MNPS Threat Rank:
C-value: 9

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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 2012. Manual of Montana Vascular Plants. BRIT Press. Fort Worth, TX).

Species Range
Present
 


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

Summary of Observations Submitted for Montana
Number of Observations: 16

(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 2012. Manual of Montana Vascular Plants. BRIT Press. Fort Worth, TX).

References
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Citation for data on this website:
Threeway Sedge — Dulichium arundinaceum.  Montana Field Guide.  .  Retrieved on , from