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

Introduction to Vascular Plants

Photograph

© Jamie Fenneman     (Photo ID #20840)


Map

E-Flora BC Static Map

Distribution of Carex trisperma
Click here to view the full interactive map and legend

Species Information

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.

SourceThe Illustrated Flora of British Columbia

Illustration

If more than one illustration is available for a species (e.g., separate illustrations were provided for two subspecies) then links to the separate images will be provided below. Note that individual subspecies or varietal illustrations are not always available.

USDA Species Characteristics

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

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

Avg

Min

Max

Elevation (metres)
799 380 1160
Slope Gradient (%)
4 0 42

Aspect (degrees)
[0 - N; 90 - E; 180 - S; 270 - W]

243 160 334
Soil Moisture Regime (SMR)
[0 - very xeric; 4 - mesic;
8 - hydric]
6 4 7
Modal Nutrient Regime
Class
B
# 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)

Habitat and 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.

SourceThe Illustrated Flora of British Columbia