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

Introduction to Vascular Plants

Photograph

© Jamie Fenneman     (Photo ID #7439)


Map

E-Flora BC Static Map

Distribution of Juncus acuminatus
Click here to view the full interactive map and legend

Species Information

General:
Perennial, loosely tufted herb from short rhizomes; stems erect, 40-75 cm tall.
Leaves:
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.
Flowers:
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.
Fruits:
Capsules egg-shaped, pointed, about as long as the perianth segments; seeds spindle-shaped, about 0.4 mm long, lacking tail-like appendages.

SourceThe Illustrated Flora of British Columbia

Illustration

If more than one illustration is available for a species (e.g., separate illustrations were provided for two subspecies) then links to the separate images will be provided below. Note that individual subspecies or varietal illustrations are not always available.

USDA Species Characteristics

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

Ecology

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

Avg

Min

Max

Elevation (metres)
Slope Gradient (%)

Aspect (degrees)
[0 - N; 90 - E; 180 - S; 270 - W]

0
Soil Moisture Regime (SMR)
[0 - very xeric; 4 - mesic;
8 - hydric]
Modal Nutrient Regime
Class
# of field plots
 species was recorded in:
5
Modal BEC Zone Class
CWH

All BEC Zones (# of stations/zone) species was recorded in

CWH(5)

Habitat and 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.

SourceThe Illustrated Flora of British Columbia