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

Carex richardsonii R. Br.
Richardson's sedge
Cyperaceae (Sedge family)

Introduction to Vascular Plants

© Bryan Kelly-McArthur  Email the photographer   (Photo ID #74466)

E-Flora BC Static Map
Distribution of Carex richardsonii
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Species Information

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Perennial, loosely tufted herb from long rhizomes; stems 10-25 cm tall, rough above, about equalling the leaves.
Sheaths brownish, the lower ones bladeless and breaking into threads; blades 6 to 9 per stem, mostly basal, flat or somewhat channeled, gradually tapering to the tips, 2-2.5 mm wide.
Spikes 2 to 4, the terminal one stalked, linear, 12-20 mm long, with male flowers, the lower spikes 1 to 3, linear, 10-20 mm long, the female flowers short-stalked, erect; bracts subtending the female spikes reduced to bladeless sheaths, up to 1 cm long.
Perigynia egg-shaped, 2.5-3.5 mm long, 1-1.5 mm wide, straw-coloured or brownish, obscurely 3-angled, appressed short-hairy, crowded, erect, short-stalked, the beaks bidentate, about 0.5 mm long or less; female scales broadly egg-shaped, dark purplish, with translucent margins, longer than the perigynia; stigmas 3; achenes 3-angled, 1.7-2 mm long.

Source: The Illustrated Flora of British Columbia

Habitat / Range

Dry rocky slopes and forests in the montane zone; common in C and SC BC (Cariboo region); E to PQ and S to VT, PA, OH, IN, IL, IO, SD and WY.

Source: The Illustrated Flora of British Columbia


Ecological Framework for Carex richardsonii

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) 230 1121 2080
Slope Gradient (%) 0 15 100
Aspect (degrees)
[0 - N; 90 - E; 180 - S; 270 - W]
0 224 360
Soil Moisture Regime (SMR)
[0 - very xeric; 4 - mesic;
8 - hydric]
1 3 6
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: AT(2), BG(2), BWBS(7), CWH(1), ESSF(10), ICH(8), IDF(124), MS(44), SBPS(101), SBS(21), SWB(4)


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

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General References