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

Epilobium glaberrimum Barbey
Glaucous Willowherb (glaucus willowherb; smooth willowherb)
Onagraceae (Evening Primrose family)

Introduction to Vascular Plants

© Jamie Fenneman  Email the photographer   (Photo ID #14083)

E-Flora BC Static Map
Distribution of Epilobium glaberrimum
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Epilobium glaberrimum ssp. fastigiatum

Species Information

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Perennial herb from short, scaly stolon; stems 8-35 cm tall, usually simple, clumped, glabrous with white bloom.
Narrowly lanceolate to egg-shaped, 1-3.4 cm long, 7-18 mm wide, entire to finely toothed, glabrous with white bloom; more or less unstalked, clasping.
Inflorescence erect, terminal; hypanthium 0.7-2.3 mm long; petals 2.5-7 mm long, pink to rose-purple, sometimes white, notched at tip; sepals 1.6-4.0 mm long; anthers 0.5-1 mm long; ovaries 1-3.4 cm long, sparsely short stiff-hairy sometimes with glandular hairs; styles 2.2-3.6 mm long; stigmas club-shaped.
Capsules, 2-5.5 cm long, linear, usually curved, sometimes sparsely hairy; stalks 5-17 mm long; seeds 0.8-1.3 mm long, pimply in lengthwise rows.

Source: The Illustrated Flora of British Columbia

USDA Species Characteristics

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

Habitat / Range

Moist streambanks, rocky slopes, and open forests in the montane to alpine zones; rare in S BC; E to AB and S to MT, UT and CA.

Source: The Illustrated Flora of British Columbia


Ecological Framework for Epilobium glaberrimum

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) 0 956 2010
Slope Gradient (%) 0 8 75
Aspect (degrees)
[0 - N; 90 - E; 180 - S; 270 - W]
20 176 360
Soil Moisture Regime (SMR)
[0 - very xeric; 4 - mesic;
8 - hydric]
3 5 8
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: BAFA(2), BG(2), BWBS(3), CDF(1), CWH(24), ESSF(28), ICH(6), IDF(2), MH(1), MS(8), SBPS(1), SBS(14)

Taxonomic and Nomenclatural Links

Additional Photo Sources

General References