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Thin-flowered Sedge - Carex tenuiflora
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 et al. 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
Montana Range
Range Descriptions
Native
Range Comments
Circumboreal south to BC, MT, CO; collected once in Flathead County (Lesica et al. 2012. Manual of Montana Vascular Plants. BRIT Press. Fort Worth, TX).
Observations in Montana Natural Heritage Program Database
Number of Observations: 4
(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.
Stewardship Responsibility
Threats or Limiting Factors
STATE THREAT SCORE REASON
Threat impact not assigned because threats are not known (MTNHP Threat Assessment 2021).
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.
MTNHP Threat Assessment. 2021. State Threat Score Assignment and Assessment of Reported Threats from 2006 to 2021 for State-listed Vascular Plants. Botany Program, Montana Natural Heritage Program, Helena, Montana.
- 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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