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

Juncus nevadensis S. Watson
Sierra rush
Juncaceae (Rush family)

Introduction to Vascular Plants
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Distribution of Juncus nevadensis
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Species Information

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Perennial herb from elongated rhizomes; stems arising singly or few together, erect, 20-75 cm tall.
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, rounded, ear-shaped lobes.
Inflorescence terminal, 3-12 cm long, with (3) 5 to 30, more or less globe-shaped heads, the heads each with many flowers, the branches few, erect; perianth segments dark brown, 3-4.5 mm long, lanceolate to short-awned, pointed, the inner about the same length as the outer; stamens 6; anthers 1-2 mm long, longer than the filaments; involucral bract shorter than inflorescence.
Capsules, egg-shaped to cylindrical, pointed, abruptly narrowed, shorter than the perianth segments; seeds barrel-like, about 0.4 mm long, lacking appendages.
This is a variable species and several infraspecific taxa (often treated as distinct species) have been described from WA and OR.

Source: The Illustrated Flora of British Columbia

USDA Species Characteristics

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

Habitat / Range

Wet lakeshores and stream margins in the lowland, steppe, and montane zones; infrequent in the Chilcotin-Cariboo region, rare elsewhere; E to AB and S to NM, AZ, and CA.

Source: The Illustrated Flora of British Columbia


Ecological Framework for Juncus nevadensis

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




Elevation (metres) 1010 1282 1555
Slope Gradient (%) 0 10 20
Aspect (degrees)
[0 - N; 90 - E; 180 - S; 270 - W]
300 300 300
Soil Moisture Regime (SMR)
[0 - very xeric; 4 - mesic;
8 - hydric]
6 6 7
Modal Nutrient Regime
Number of field plots
 species was recorded in:
Modal BEC Zone Class
All BEC Zones (# of stations/zone) species was recorded in: BAFA(1), IDF(1)


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 columbianus

Taxonomic and Nomenclatural Links

Additional Photo Sources

General References