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

Carex cusickii Mack. ex Piper & Beattie
Cusick's sedge
Cyperaceae (Sedge family)

Introduction to Vascular Plants

© Jeremy Gatten  Email the photographer   (Photo ID #30024)

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Distribution of Carex cusickii
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Species Information

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Perennial, somewhat tufted herb from fibrous roots; stems 20-100 cm tall, longer than the leaves.
Sheaths coppery-coloured towards the tips, conspicuously red-dotted with glandular projections on the side nearest the stem, the blades of the lower ones large, firm, persistent; blades 3 or 4 per stem, borne mostly from near the bases, 2.5-6 mm wide, flat, the margins rolled-under.
Spikes numerous, clustered in several aggregated heads, in a 3.5-8 cm long, dense, branched inflorescence, egg-shaped, few-flowered, 4-7 mm long, 3-4 mm wide, erect to ascending with both female and male flowers, the male flowers towards the tips; bracts inconspicuous, sheathless, often similar to the female scales.
Perigynia narrowly triangular to egg-shaped, 2.5-4 mm long, about 1.2-1.5 mm wide, straw-coloured to brown, biconvex, smooth, strongly nerved on the outside, short-stalked, the beaks as long as the bodies, winged, the margins fine-toothed; female scales egg-shaped, equalling or slightly longer than the perigynia, pointed, brown, the margins translucent; stigmas 2; achenes lens-shaped, 1.2-1.4 mm long.

Source: The Illustrated Flora of British Columbia

Habitat / Range

Bogs, fens, marshes and lake margins in the lowland and montane zones; frequent in S BC, less frequent N to 55degreeN; S to WY, UT and CA.

Source: The Illustrated Flora of British Columbia


Ecological Framework for Carex cusickii

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) 150 976 2452
Slope Gradient (%) 0 9 78
Aspect (degrees)
[0 - N; 90 - E; 180 - S; 270 - W]
20 215 270
Soil Moisture Regime (SMR)
[0 - very xeric; 4 - mesic;
8 - hydric]
2 5 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: BWBS(1), CDF(7), CWH(3), ICH(1), IDF(1), IMA(1), MS(5), SBPS(2), SBS(3)


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.

Synonyms and Alternate Names

Carex diandra var. ampla
Carex obovoidea Cronquist

Taxonomic and Nomenclatural Links

Additional Photo Sources

General References