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

Carex albonigra Mack.
two-toned sedge (blackandwhite sedge)
Cyperaceae (Sedge family)

Introduction to Vascular Plants

© Jamie Fenneman  Email the photographer   (Photo ID #19684)

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

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Perennial, tufted herb from short rhizomes; stems 10-30 cm tall, much exceeding the leaves.
Sheaths reddish-dark towards the bases; blades flat, 2-7 mm wide, the lower ones not much reduced.
Spikes usually 3, unstalked to short-stalked below, 0.6-2.5 cm long, the terminal one with both female and male flowers, the female flowers towards the tips, the lower 1 or 2 spikes with female flowers, erect; bract subtending the spikes short-sheathing, leaflike, about equalling or shorter than the spikes.
Perigynia egg-shaped, flattened, 2.7-3.5 mm long, 1.8-2 mm wide, reddish-black, flat, the margins translucent, 2-nerved near the margins, the beaks short, less than 0.4 mm long; female scales broadly egg-shaped, about as long as and wider than the perigynia, pointed at the tips, reddish-black, roughly pimpled, with white translucent margins and tips; stigmas 3; achenes 3-angled, granular, 1.3-1.7 mm long.

Source: The Illustrated Flora of British Columbia

Habitat / Range

Dry meadows and rocky slopes in the upper subalpine and alpine zones; common throughout BC in and E of the Coast-Cascade Mountains, infrequent in coastal SW BC; N to AK, YT and NT, E to SW AB and S to NM, AZ and CA.

Source: The Illustrated Flora of British Columbia


Ecological Framework for Carex albonigra

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) 252 2039 3000
Slope Gradient (%) 0 22 235
Aspect (degrees)
[0 - N; 90 - E; 180 - S; 270 - W]
2 215 360
Soil Moisture Regime (SMR)
[0 - very xeric; 4 - mesic;
8 - hydric]
0 2 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: AT(74), BAFA(96), BWBS(1), CMA(2), ESSF(126), IMA(47), MH(1), MS(3), SWB(10)


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