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

Juncus interior Wiegand
inland rush
Juncaceae (Rush family)

Introduction to Vascular Plants

© Frank Lomer  Email the photographer   (Photo ID #27568)

E-Flora BC Static Map
Distribution of Juncus interior
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Species Information

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Perennial, loosely tufted herb from fibrous roots; stems erect, 15-75 cm long.
Located on the lower 1/3 of the stem, narrow, flattened, lacking cross-walls; sheaths open, with short (not more than 1 mm long), wider than long, membranaceous to nearly so, whitish, opaque, ear-shaped lobes.
Inflorescence terminal, 5-15 cm long, the bracts ascending, longer than the inflorescence, perianth segments green, 3-4 mm long, pointed, the inner about the same length as the outer; stamens 6; anthers 0.4-0.6 mm long, shorter than the filaments.
Capsules, broadly rounded, 1-celled, about the same length as the perianth segments; seeds ellipsoid, about 0.4-0.7 mm long, lacking tail-like appendages.
This is a member of the Juncus tenuis complex, whose taxonomy and distribution in BC has not been studied.

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

Dry to moist pastures, mostly on disturbed soil in the lowland, steppe and montane zones; infrequent in S BC; N to AK, YT and NT, E to PQ and NS and S to PA, TN, LA, TX, NM, AZ, ID and WA.

Source: The Illustrated Flora of British Columbia


Ecological Framework for Juncus interior

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) 370 370 370
Slope Gradient (%) 0 0 0
Aspect (degrees)
[0 - N; 90 - E; 180 - S; 270 - W]
Soil Moisture Regime (SMR)
[0 - very xeric; 4 - mesic;
8 - hydric]
7 7 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: CWH(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.

Taxonomic and Nomenclatural Links

Additional Photo Sources

General References