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

Introduction to Vascular Plants


© Jamie Fenneman     (Photo ID #19684)


E-Flora BC Static Map

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

Species Information

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.

SourceThe Illustrated Flora of British Columbia


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.


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)
2039 252 3000
Slope Gradient (%)
22 0 235

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

215 2 360
Soil Moisture Regime (SMR)
[0 - very xeric; 4 - mesic;
8 - hydric]
2 0 8
Modal Nutrient Regime
# 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)

Habitat and 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.

SourceThe Illustrated Flora of British Columbia