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Montana Field Guide

Montana Field Guides

Steven's Scandinavian Sedge - Carex stevenii
Other Names:  Carex norvegica ssp. stevenii

Species of Concern

Global Rank: G5T4?
State Rank: S2?
* (see State Rank Reason below)

Agency Status
USFWS:
USFS:
BLM:
MNPS Threat Rank:
C-value: 8

External Links






State Rank Reason (see State Rank above)
Rare in Montana, where it is currently known from a few scattered sites in mountainous areas across the southern half of the state. Additional data on population levels are needed. Survey of suitable habitats will likely document additional occurrences.
 
General Description
Steven's Norwegian sedge is a loose clump-forming perennial with flowering stems up to 30 cm tall arising from a slender short-creeping rootstock. Flat, stiff, erect leaves, 2-4 mm wide, are clustered along the bases of the stems, and dried leaves of the previous year are conspicuously retained. The flowering stems are triangular, much taller than the leaves, and are rough to the touch above. Three to five cylindical spikes are borned on short stalks along the top of the stem, subtended by a leaf-like bract. The perigynia are subtended by dark-colored scales with obtuse tips and transluscent margins. The terminal spike is bisexual with female flowers above male flowers and the lateral spikes are unisexual, with only female flowers. At maturity the perigynia are longer than the scales, about 2.5 mm long, elliptical shaped with a short toothed beak, greenish becoming brown with age, and smooth or with inconspicuous bumps on the surface. Each perigynium has 3 styles and a 3-sided achene.

Phenology
Fruiting in July-August.

Diagnostic Characteristics
Carex stevenii belongs to a group of related species that are distinguished by well developed basal leaves, more than one spike, the lateral spikes with only female flowers, perigynia lacking hairs, and pistils with 3 style branches. It is distinguished from other members of this group by having short cylindrical rather than long cylindrical or oblong spikes. It is distinguished from Carex norvegica subsp. inserrulata by having spikes on short flowering stalks, many male flowers at the base of the terminal spike, and a perigynium surface that is smooth or nearly so. A hand lens and technical key are needed for positive identification.

Species Range
Present
 


Range Comments
ID, MT, WY, UT, CO and NM (Lesica 2012. Manual of Montana Vascular Plants. BRIT Press. Fort Worth, TX).

Summary of Observations Submitted for Montana
Number of Observations: 3

(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
Found along streams and in wet meadows in the montane and subalpine and growing in moist turf in the alpine.

References
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Citation for data on this website:
Steven's Scandinavian Sedge — Carex stevenii.  Montana Field Guide.  .  Retrieved on , from