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

Epilobium brachycarpum C. Presl
tall annual willowherb
Onagraceae (Evening Primrose family)

Introduction to Vascular Plants

© Paul Handford  Email the photographer   (Photo ID #68361)

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Distribution of Epilobium brachycarpum
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Species Information

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Annual herb from a taproot; stems erect, 20-100 (200) cm tall, glabrous and peeling below, appressed short stiff-hairy and generally glandular-hairy above.
Alternate, generally deciduous early, linear to narrowly elliptic, 1-5 cm long, sharp-pointed, usually folded along midrib, more or less glabrous, often with bundles of smaller leaves in axils of leaves.
Inflorescence terminal, open, panicle-like; hypanthium 1.5-8 (16) mm long; petals 2-15 mm long, white to rose-purple, notched at tip; sepals 2-8 mm long; stamens less than or equal to length of pistil; stigmas club-shaped or occasionally 4-lobed.
Capsules, 1.5-3.5 cm long, glabrous or glandular; stalks 3-20 mm long; seeds 1.4-2.7 mm long, pimply, tuft of hair white, 7-8 mm long, readily detaching.

Source: The Illustrated Flora of British Columbia

Habitat / Range

Dry shrublands, forest openings and disturbed areas in the lowland, steppe and lower montane zones; common in S BC, especially E of the Coast-Cascade Mountains; E to PQ and NB and S to CA.

Source: The Illustrated Flora of British Columbia


Ecological Framework for Epilobium brachycarpum

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) 171 630 1884
Slope Gradient (%) 0 27 84
Aspect (degrees)
[0 - N; 90 - E; 180 - S; 270 - W]
0 206 360
Soil Moisture Regime (SMR)
[0 - very xeric; 4 - mesic;
8 - hydric]
0 2 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: BG(19), CDF(3), CWH(79), ESSF(3), ICH(13), IDF(32), MS(19), PP(14), SBS(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 paniculatum Nutt. ex Torr. & A. Gray
Epilobium paniculatum var. hammondii (Howell) M. Peck
Epilobium paniculatum var. juncundum (A. Gray) Trel.
Epilobium paniculatum var. laevicaule (Rydb.) Munz
Epilobium paniculatum var. paniculatum
Epilobium paniculatum var. subulatum (Hausskn.) Fernald
Epilobium paniculatum var. tracyi (Rydb.) Munz

Taxonomic and Nomenclatural Links

Additional Photo Sources

General References