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

Carex diandra Schrank
lesser-panicled sedge (lesser tussock sedge)
Cyperaceae (Sedge family)

Introduction to Vascular Plants

© Adolf Ceska  Email the photographer   (Photo ID #20765)

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Distribution of Carex diandra
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Species Information

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General:
Perennial, somewhat tufted herb from fibrous roots; stems 30-100 cm tall, roughened on the angles, longer than the leaves.
Leaves:
Sheaths not coppery-coloured, conspicuously red-dotted with glandular projections on the side nearest the stems, the blades of the lower ones large, firm, persistent; blades 3 or 4 per stem, mostly from near the base, 1-2.5 (3) mm wide, flat, the margins rolled-under.
Flowers:
Spikes numerous in a 2- to 5-cm long, narrow head, egg-shaped, few-flowered, 4-5 mm long, 3-4 mm wide, erect or mostly ascending, with both female and male flowers, the male flowers towards the tips; bracts inconspicuous, sheathless, often similar to the female scales.
Fruits:
Perigynia broadly egg-shaped, 2.5-3 mm long, 1-1.3 mm wide, straw-coloured to usually dark brown, biconvex, smooth, strongly nerved on the outside, short-stalked, the beaks as long as the bodies, slightly bidentate, not winged, the margins obscurely 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

USDA Species Characteristics

Flower Colour:
Green
Blooming Period:
Late Spring
Fruit/Seed characteristics:
Colour: Brown
Present over the Summer
Source:  The USDA

Habitat / Range

Bogs, swamps and fens in all but the alpine zone; common in BC in and east of the Coast-Cascade Mountains, rare in SW BC; circumboreal, N to AK, YT and NT, E to NF and S to NH, PA, OH, IL, IN, MO, NE, NM, UT, NV and CA; Iceland, Eurasia.

Source: The Illustrated Flora of British Columbia

Ecology

Ecological Framework for Carex diandra

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) 200 1022 2020
Slope Gradient (%) 0 0 34
Aspect (degrees)
[0 - N; 90 - E; 180 - S; 270 - W]
20 135 358
Soil Moisture Regime (SMR)
[0 - very xeric; 4 - mesic;
8 - hydric]
2 6 8
Modal Nutrient Regime
Class
D
Number of field plots
 species was recorded in:
171
Modal BEC Zone Class
SBPS
All BEC Zones (# of stations/zone) species was recorded in: BWBS(19), CWH(1), ESSF(3), ICH(15), IDF(27), MH(1), MS(28), PP(1), SBPS(35), SBS(33), SWB(3)

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.

Taxonomic and Nomenclatural Links

Additional Photo Sources

General References