Carex haydeniana Olney
Hayden's sedge (cloud sedge)
Cyperaceae (Sedge family)
Introduction to Vascular Plants
Hayden's sedge (cloud sedge)
Cyperaceae (Sedge family)
Introduction to Vascular Plants
Species Information
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.
Illustration
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.
Illustration 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)
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 |
||
|
Avg |
Min |
Max |
|
| Elevation
(metres) |
1780 | 675 | 2540 |
| Slope
Gradient (%) |
29 | 0 | 70 |
|
Aspect (degrees) |
144 | 28 | 340 |
| Soil
Moisture Regime (SMR) [0 - very xeric; 4 - mesic; 8 - hydric] |
3 | 0 | 8 |
| Modal
Nutrient Regime
Class |
D | ||
| #
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) | ||
|
Source:
Klinkenberg 2013
|
|||
Habitat and 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.Status Information
Synonyms
Synonyms and Alternate Names:
Carex festiva var. decumbens T. Holm
Carex macloviana subsp. haydeniana (Olney) Roy L. Taylor & MacBryde
Carex nubicola Mack.