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

Juncus drummondii var. subtriflorus E. Mey. (E. Mey.) C.L. Hitchc.
Drummond's rush (threeflower rush)
Juncaceae (Rush family)

Introduction to Vascular Plants
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E-Flora BC Static Map
Distribution of Juncus drummondii var. subtriflorus
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Species Information

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Perennial tufted herb from short rhizomes; stems wiry, erect, 15-40 cm tall.
Reduced to sheaths with short awns at the base of the stem, or the uppermost of the basal sheaths with blades less than 1 cm long.
Inflorescence a loose head with 1 to 4, nearly terminal flowers, appearing as if it is on the side of the stem; perianth segments green to brown, pointed, 5-7 mm long, the inner ones slightly shorter; stamens 6; anthers about 1.5 mm long, shorter than the filaments; involucral bract 1-3 cm long, cylindrical, resembling a continuation of the stem.
Capsules, cylindrical, notched, longer than the perianth segments; seeds spindle-shaped, 0.5 mm long with long, tail-like appendages at each end of the seed.
Two varieties occur in W North America. Our BC material has been identified as var. drummondii but var. subtriflorus can be expected in S BC.

1. Capsules usually at least 1 mm longer than the perianth segments; perianth 5-6 mm long.................. var. subtriflorus (E. Mey.) C.L. Hitchc.

1. Capsules about equal to the perianth segments; perianth 6-7 mm long..................var. drummondii

Source: The Illustrated Flora of British Columbia

Habitat / Range

Mesic to moist rocky slopes, heaths, snowbed sites, streambanks, open forests and meadows in the subalpine and alpine zones; common throughout BC; N to YT and NT, E to AB and S to NM and NV.

Source: The Illustrated Flora of British Columbia


Ecological Framework for Juncus drummondii var. subtriflorus

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) 1862 1962 2062
Slope Gradient (%) 7 7 8
Aspect (degrees)
[0 - N; 90 - E; 180 - S; 270 - W]
52 82 114
Soil Moisture Regime (SMR)
[0 - very xeric; 4 - mesic;
8 - hydric]
6 6 6
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: ESSF(2)


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 drummondii var. logifructus H. St. John

Taxonomic and Nomenclatural Links

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General References