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

Epilobium leptocarpum Hausskn.
small-fruited willowherb (slenderfruit willowherb)
Onagraceae (Evening Primrose family)

Introduction to Vascular Plants

© Jamie Fenneman  Email the photographer   (Photo ID #30005)

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

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Perennial herb from a taproot; stems erect or decumbent at base, 5-30 cm tall, slender, simple or branched, often reddish, hairy or glabrous except for decurrent lines of hairs from the leaf bases, with fleshy winter bulblets at the base; young vegetative buds often present in leaf axils.
Mostly opposite, lanceolate to lance-oblong or elliptic, 0.5-4 cm long, 2-13 mm wide, blunt to pointed at base, tapering to blunt tip, finely toothed, glabrous or hairy on the margins; short-stalked.
Inflorescence nodding to almost erect, few-flowered, terminal, short appressed-hairy; petals 2-6 mm long, whitish to pink; sepals 1-4 mm long, glabrous to short-hairy; stigmas broadly club-shaped.
Capsules, 1-5 cm long, more or less glabrous; seeds 0.8-1 mm long, pimply in parallel lines, tuft of hairs tawny, 3-6 mm long, persisting.

Source: The Illustrated Flora of British Columbia

Habitat / Range

Moist meadows and streambanks in the montane to alpine zones; rare throughout BC; N to AK and S to MT, ID and OR.

Source: The Illustrated Flora of British Columbia


Ecological Framework for Epilobium leptocarpum

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) 430 1071 1600
Slope Gradient (%) 0 38 202
Aspect (degrees)
[0 - N; 90 - E; 180 - S; 270 - W]
10 85 270
Soil Moisture Regime (SMR)
[0 - very xeric; 4 - mesic;
8 - hydric]
0 4 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: BWBS(1), ESSF(1), ICH(1), IDF(4), MS(3), PP(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

Epilobium leptocarpum var. leptocarpum

Taxonomic and Nomenclatural Links

Additional Photo Sources

General References