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

Carex haydeniana Olney
Hayden's sedge (cloud sedge)
Cyperaceae (Sedge family)

Introduction to Vascular Plants

© Bryan Kelly-McArthur  Email the photographer   (Photo ID #79555)

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

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General:
Perennial, tufted herb from short, fibrous roots; stems 10-40 cm tall, exceeding the leaves.
Leaves:
Sheaths tight; blades flat, 2-3.5 mm wide, borne on the lower 1/3 of the stem, lowermost stem leaves reduced to scales.
Flowers:
Spikes 3 to 6 aggregated into a dense, 1- to 2-cm long, triangular to egg-shaped head, unstalked, with both female and male flowers, the female ones towards the tips; bracts subtending the spikes sheathless, reduced, inconspicuous.
Fruits:
Perigynia egg-shaped, 4.5-6 mm long, 1.5-2.5 mm wide, brownish to dark brown, more or less flattened, the margins winged nearly to the bases and the upper 1/2 fringed with teeth, lightly several-nerved on the back, with faint nerves or nerveless below, the beak obscurely bidentate, about 1.5 mm long, narrowly margined and toothed below; female scales elliptical, dark brown, somewhat shorter and narrower than the perigynia; stigmas 2; achenes lens-shaped, 1.4-1.8 mm long.

Source: The Illustrated Flora of British Columbia

Habitat / Range

Moist to mesic meadows, rocky slopes and moraines in the subalpine and alpine zones; infrequent in SC and SE BC; E to SW AB and S to CO, AZ and CA.

Source: The Illustrated Flora of British Columbia

Ecology

Ecological Framework for Carex haydeniana

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

Minimum

Average

Maximum

Elevation (metres) 675 1780 2540
Slope Gradient (%) 0 29 70
Aspect (degrees)
[0 - N; 90 - E; 180 - S; 270 - W]
28 144 340
Soil Moisture Regime (SMR)
[0 - very xeric; 4 - mesic;
8 - hydric]
0 3 8
Modal Nutrient Regime
Class
D
Number of field plots
 species was recorded in:
33
Modal BEC Zone Class
ESSF
All BEC Zones (# of stations/zone) species was recorded in: BAFA(2), ESSF(15), ICH(3), IDF(1), IMA(1), MH(2), MS(1), SBS(4)

Climate

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 festiva var. decumbens T. Holm
Carex macloviana subsp. haydeniana (Olney) Roy L. Taylor & MacBryde
Carex nubicola Mack.

Taxonomic and Nomenclatural Links

Additional Photo Sources

Related Databases

General References