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

Carex trisperma Dewey
three-seeded sedge
Cyperaceae (Sedge family)

Introduction to Vascular Plants

© Jamie Fenneman  Email the photographer   (Photo ID #20840)

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Distribution of Carex trisperma
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Species Information

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General:
Perennial, loosely tufted herb from elongated, light brown, branched stolons; stems 20-70 cm tall, slender and arching, shorter than or about as long as the leaves.
Leaves:
Sheaths tight; blades numerous, borne on the lower part of the stem, 0.3-2 mm wide, flat, the lower ones reduced.
Flowers:
Spikes 3 to 5 in a long, narrow inflorescence, separated, the uppermost closer together, egg-shaped, 1- to 6-flowered, about 4-6 mm long, ascending, with both female and male flowers, the female flowers towards the tips, the male flowers inconspicuous; bracts awnlike, the lowermost 3-10 cm long.
Fruits:
Perigynia elliptical, 2.5-3.7 mm long, 1.5-2 mm wide, light green, plano-convex, smooth, finely-nerved, the beaks 0.4 mm long, entire; female scales egg-shaped, covering 1/2 of the perigynia, pointed, green, with green midribs; stigmas 2; achenes lens-shaped, 2 mm long, filling the perigynia.

Source: The Illustrated Flora of British Columbia

USDA Species Characteristics

Flower Colour:
Green
Blooming Period:
Late Spring
Fruit/Seed characteristics:
Colour: Brown
Present over the Summer
Source:  The USDA

Habitat / Range

Bogs and moist to wet forests in the montane zone; infrequent in BC east of the Coast-Cascade Mountains; E to NF and S to ME, MA, NC, TN, and MN.

Source: The Illustrated Flora of British Columbia

Ecology

Ecological Framework for Carex trisperma

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

Minimum

Average

Maximum

Elevation (metres) 380 799 1160
Slope Gradient (%) 0 4 42
Aspect (degrees)
[0 - N; 90 - E; 180 - S; 270 - W]
160 243 334
Soil Moisture Regime (SMR)
[0 - very xeric; 4 - mesic;
8 - hydric]
4 6 7
Modal Nutrient Regime
Class
B
Number of field plots
 species was recorded in:
20
Modal BEC Zone Class
ICH
All BEC Zones (# of stations/zone) species was recorded in: BWBS(2), ICH(11), SBS(7)

Climate

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 not evaluated, unknown or variable.

Taxonomic and Nomenclatural Links

Additional Photo Sources

General References