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

Epilobium halleanum Hausskn.
Hall's willowherb (glandular willowherb)
Onagraceae (Evening Primrose family)

Introduction to Vascular Plants

© Jamie Fenneman  Email the photographer   (Photo ID #29948)

E-Flora BC Static Map
Distribution of Epilobium halleanum
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Species Information

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Perennial herb from scaly succulent shoots from a rhizome; stems 20-60 cm tall, with lines of short, stiff hairs below, mixed with glandular hairs above; winter bulblets small, underground.
Opposite, at least below, egg-shaped to elliptic below, narrower above, 0.5-4.7 cm long, 3-14 mm wide, blunt to somewhat pointed, entire to finely toothed, mostly glabrous, fringed with short, stiff hairs; unstalked or stalks to 1.5 mm long.
Inflorescence more or less nodding when in bud; hypanthium 0.5-1.7 mm long; petals 1.6-5.5 mm long, white or pink, notched at tip; sepals 1.2-2.8 mm long, green, glabrous or sparsely glandular-hairy, anthers 0.3-0.9 mm long; ovaries 1.0-1.4 cm long, densely glandular-hairy and short stiff-hairy, rarely glabrous; styles 0.8-5 mm long; stigmas club-shaped.
Capsules, 2.4-6 cm long, glabrous to hairy; stalks 10-40 mm long; seeds narrowly egg-shaped, 1.1-1.6 mm long, pimply, tuft of hairs white, 3-6 mm long, readily detaching.

Source: The Illustrated Flora of British Columbia

Habitat / Range

Moist slopes and open forests in the montane zone; rare throughout BC; E to W SK and S to SD, CO, AZ and CA.

Source: The Illustrated Flora of British Columbia


Ecological Framework for Epilobium halleanum

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) 870 900 930
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]
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: IDF(1), SBS(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

Epilobium brevistylum var. subfalcatum (Trel.) Munz
Epilobium brevistylum var. tenue (Trel.) Jeps.
Epilobium glandulosum var. tenue (Trel.) C.L. Hitchc.
Epilobium pringleanum Hausskn.
Epilobium pringleanum var. tenue (Trel.) Munz

Taxonomic and Nomenclatural Links

Additional Photo Sources

Related Databases

General References