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

Juncus biglumis L.
two-flowered rush (twoflowered rush)
Juncaceae (Rush family)

Introduction to Vascular Plants
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E-Flora BC Static Map
Distribution of Juncus biglumis
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Species Information

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General:
Perennial, tufted herb from short rhizomes; the stems erect, 3-20 cm tall.
Leaves:
Basal, nearly circular in cross-section, tapered, lacking cross-walls.
Flowers:
Inflorescence a single, terminal head of usually 2 (or 3) flowers, the flowers lacking bractlets; perianth segments dark brown with lighter tips, 2.5-3 mm long, blunt, subequal; stamens 6; anthers 0.3-0.4 mm long, shorter than the filaments; bracts blunt, longer than the flowers.
Fruits:
Capsules, egg-shaped, notched, 1.5-2 times longer than the perianth segments, dark; seeds spindle-shaped, about 0.7-0.9 mm long, with short tail-like appendages at each end.

Source: The Illustrated Flora of British Columbia

USDA Species Characteristics

Flower Colour:
Purple
Blooming Period:
Summer
Fruit/Seed characteristics:
Colour: Brown
Present from Summer to Fall
Source:  The USDA

Habitat / Range

Wet seepy places, mossy ledges, gravelly shores and marshes in the subalpine and alpine zones; infrequent in BC N of 55degreeN; circumpolar, N to AK, YT and NT, E to PQ and S to CO; Greenland, Eurasia.

Source: The Illustrated Flora of British Columbia

Ecology

Ecological Framework for Juncus biglumis

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) 940 1652 2000
Slope Gradient (%) 0 19 70
Aspect (degrees)
[0 - N; 90 - E; 180 - S; 270 - W]
40 261 350
Soil Moisture Regime (SMR)
[0 - very xeric; 4 - mesic;
8 - hydric]
2 4 7
Modal Nutrient Regime
Class
C
Number of field plots
 species was recorded in:
14
Modal BEC Zone Class
ESSF
All BEC Zones (# of stations/zone) species was recorded in: BAFA(5), ESSF(6)

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