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

Juncus acuminatus Michx.
tapered rush (tapertip rush)
Juncaceae (Rush family)

Introduction to Vascular Plants

© Jamie Fenneman  Email the photographer   (Photo ID #7439)

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

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Perennial, loosely tufted herb from short rhizomes; stems erect, 40-75 cm tall.
Located along the stem, nearly circular in cross-section, tapered, but slightly flattened, the early leaves stiff, with prominent complete cross-walls, sheaths open, with short, rounded, ear-shaped lobes.
Inflorescence terminal, the several to many heads with 5 to 20 flowers, cone-shaped, 3-12 cm long, the branches erect; perianth segments greenish-brown, 3-3.5 mm long, pointed, the inner about equal to the outer; stamens 3; anthers 0.7-1 mm long, shorter than the filaments; involucral bract shorter than the inflorescence.
Capsules egg-shaped, pointed, about as long as the perianth segments; seeds spindle-shaped, about 0.4 mm long, lacking tail-like appendages.

Source: The Illustrated Flora of British Columbia

USDA Species Characteristics

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

Habitat / Range

Lakeshores, wet ditches, marshes and bogs in the lowland and montane zones; frequent in SW BC, infrequent E of the Coast-Cascade Mountains; disjunct E to ON, PQ and NS, and S to ME, MA, PA, NC, FL, MS, TX, NM, AZ and CA.

Source: The Illustrated Flora of British Columbia


Ecological Framework for Juncus acuminatus

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)
Slope Gradient (%)
Aspect (degrees)
[0 - N; 90 - E; 180 - S; 270 - W]
Soil Moisture Regime (SMR)
[0 - very xeric; 4 - mesic;
8 - hydric]
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(5)


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 cool temperate & cool mesothermal.

Taxonomic and Nomenclatural Links

Additional Photo Sources

General References