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Montana Field Guide

Montana Field Guides

Thin-flowered Sedge - Carex tenuiflora

Species of Concern

Global Rank: G5
State Rank: S2
* (see State Rank Reason below)

Agency Status
USFWS:
USFS:
BLM:
MNPS Threat Rank: 3
C-value: 10

External Links






State Rank Reason (see State Rank above)
Rare in Montana, where it is currently known from only one site in Glacier National Park. The potential for negative impacts to the occurrence are minimal.
 
General Description
Caespitose. Stems weak, often prostrate, 20–50 cm. Leaves basal and cauline; blades ca. 1 mm wide. Inflorescence of 2 to 4 sessile, aggregated spikes; lowest bract inconspicuous. Spikes 4–6 mm long, all similar, bisexual; female flowers above. Perigynia spreading to ascending, pale green, narrowly ovoid, 3–3.5 mm long with an inconspicuous beak; stigmas 2. Female scales hyaline to tan with a green midvein, shorter than the perigynia. Achene 2-sided, filling the perigynium (Lesica 2012. Manual of Montana Vascular Plants. BRIT Press. Fort Worth, TX).

Phenology
Fruit mature in July-August.

Diagnostic Characteristics
Carex tenuiflora could be confused with two other more common peatland sedges: C. interior and C. canescens. The former has lance-shaped perigynia, and both have scales that are only half the length of the perigynia. A hand lens or microscope will be needed to observe these characters.

Species Range
Present
 


Range Comments
Circumboreal south to BC, MT, CO; collected once in Flathead County (Lesica 2012. Manual of Montana Vascular Plants. BRIT Press. Fort Worth, TX).

Summary of Observations Submitted for Montana
Number of Observations: 2

(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
Wet, organic soil of Sphagnum-dominated fens in the montane zone.

References
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Citation for data on this website:
Thin-flowered Sedge — Carex tenuiflora.  Montana Field Guide.  .  Retrieved on , from