E-Flora BC: Electronic Atlas of the Flora of British Columbia

Carex interior L.H. Bailey
inland sedge
Cyperaceae (Sedge family)

Introduction to Vascular Plants

© Bryan Kelly-McArthur  Email the photographer   (Photo ID #79557)

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Distribution of Carex interior
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Species Information

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Perennial, densely tufted herb from fibrous roots; stems 15-50 cm tall, usually longer than the leaves, roughened above on the angles.
Sheaths tight; blades about 3 per stem, flat or slightly channeled, borne on lower 1/2 of the stem, 1-3 mm wide, the lower ones reduced.
Spikes 2 to 6, the terminal one 0.4-0.7 mm long, with both male and female flowers, the female flowers towards the tips (sometimes almost all male and linear or almost all female and cylindrical), the lower spikes 1 to 5, ascending to widely spreading, remote to crowded, (1) 5- to 10-flowered, with female flowers only, unstalked; bracts inconspicuous, scalelike.
Perigynia egg-shaped to deltoid, 2.2-3.2 mm long, 1.5-2 mm wide, widest towards the bases, plano-convex, spreading, ascending or appressed, greenish or pale brown, finely-nerved to nerveless, sharp and thick margined, spongy below, the beaks 1/3 to 1/4 the length of the bodies, inconspicuously bidentate; female scales broadly egg-shaped, rounded at the tips, shorter than the perigynia, yellowish-brown, with greenish midribs, the margins whitish and translucent; stigmas 2; achenes lens-shaped, 1.2-1.5 mm long.

Source: The Illustrated Flora of British Columbia

USDA Species Characteristics

Flower Colour:
Blooming Period:
Mid Spring
Fruit/Seed characteristics:
Colour: Brown
Present from Spring to Summer
Source:  The USDA

Habitat / Range

Bogs, fens, swamps and wet meadows in the lowland, steppe and montane zones; frequent E of the Coast-Cascade Mountains, infrequent in SW BC; N to AK, YT and NT, E to NF and S to ME, PA, VA, GA, AR, KS, NM, AZ and CA.

Source: The Illustrated Flora of British Columbia


Ecological Framework for Carex interior

The table below shows the species-specific information calculated from
original data (BEC database) provided by the BC Ministry of Forests and Range.
(Updated August, 2013)

Site Information
Value / Class




Elevation (metres) 5 934 1969
Slope Gradient (%) 0 3 120
Aspect (degrees)
[0 - N; 90 - E; 180 - S; 270 - W]
5 155 354
Soil Moisture Regime (SMR)
[0 - very xeric; 4 - mesic;
8 - hydric]
0 6 8
Modal Nutrient Regime
Number of field plots
 species was recorded in:
Modal BEC Zone Class
All BEC Zones (# of stations/zone) species was recorded in: BAFA(1), BWBS(19), CDF(3), CWH(11), ESSF(20), ICH(39), IDF(11), MS(13), SBPS(10), SBS(46), SWB(1)


The climate type for this species, as reported in the: "British Columbia plant species codes and selected attributes. Version 6 Database" (Meidinger et al. 2008), is montane boreal & cool temperate.

Synonyms and Alternate Names

Carex interior subsp. charlestonensis Clokey
Carex interior var. keweenawensis F.J. Herm.

Taxonomic and Nomenclatural Links

Additional Photo Sources

General References