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

Juncus alpinoarticulatus Chaix
alpine rush (northern green rush)
Juncaceae (Rush family)

Introduction to Vascular Plants

© Adolf Ceska  Email the photographer   (Photo ID #11502)

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Distribution of Juncus alpinoarticulatus
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Species Information

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General:
Perennial, loosely tufted herb from short rhizomes; stems erect, 15-45 cm tall.
Leaves:
Located on the lower part of the stem, nearly circular in cross-section, tapered, the early leaves stiff, with prominent complete cross-walls; sheaths open, with short, pointed, ear-shaped lobes.
Flowers:
Inflorescence terminal, 3-7 cm long, the few to several heads cone-shaped, mostly 3- to 6- (10-) flowered, the branches few, erect; perianth segments brown or purplish-brown, 2-2.5 mm long, generally blunt and rounded but the inner shorter and the outer longer and pointed; stamens 6; anthers shorter than the filaments; involucral bracts usually shorter than the inflorescence.
Fruits:
Capsules, rounded at the tops, about as long as the perianth segments or slightly longer; seeds spindle-shaped, about 0.4 mm long, lacking appendages.

Source: The Illustrated Flora of British Columbia

Habitat / Range

Lakeshores, riverbanks, gravel bars, bogs and marshes from the lowland to subalpine zones; infrequent throughout BC; circumpolar, N to AK, YT and NT, E to NF and S to ME, PA, IN, IL, IA, NE, CO, UT, ID and WA; Greenland, Eurasia.

Source: The Illustrated Flora of British Columbia

Ecology

Ecological Framework for Juncus alpinoarticulatus

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) 823 1081 1212
Slope Gradient (%) 0 4 17
Aspect (degrees)
[0 - N; 90 - E; 180 - S; 270 - W]
120 127 135
Soil Moisture Regime (SMR)
[0 - very xeric; 4 - mesic;
8 - hydric]
3 5 7
Modal Nutrient Regime
Class
D
Number of field plots
 species was recorded in:
4
Modal BEC Zone Class
IDF
All BEC Zones (# of stations/zone) species was recorded in: ESSF(1), IDF(2)

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

Juncus alpinus
Juncus geniculatus

Taxonomic and Nomenclatural Links

Additional Photo Sources

General References