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

Salix tweedyi (Bebb ex Rose) C.R. Ball
Tweedy's willow
Salicaceae (Willow family)

Introduction to Vascular Plants

© Brenda Costanzo  Email the photographer   (Photo ID #22451)

E-Flora BC Static Map
Distribution of Salix tweedyi
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Species Information

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Dioecious shrubs, 1-3 m tall, not colonial; branches erect, flexible at base; twigs yellow-brown, sparsely to densely hairy.
Alternate, simple, elliptic or broadly elliptic, 3.5-10 cm long, 1.7-5 cm wide, lower surface glaucous or not, long soft-hairy, hairs white, upper surface dull, long soft-hairy to nearly smooth, margins toothed with coarse, spreading teeth or nearly entire, bases rounded or heart-shaped, tips pointed; leaf stalks not glandular at top; stipules leaflike, persistent.
Unisexual, lacking sepals and petals, borne in catkins which flower before leaves emerge, the catkins stout, unstalked; floral bracts dark, hairs straight or wavy; stamens 2; ovaries 1, smooth; styles 1.1-2.8 mm long.
Capsules which split open to release the seeds, each of which is surrounded by a tuft of hairs; stalks 0.4-1.5 mm long.

Source: The Illustrated Flora of British Columbia

Habitat / Range

Moist streamsides and lakeshores in the montane zone; rare in SC BC; S to WY, ID and WA.

Source: The Illustrated Flora of British Columbia


Ecological Framework for Salix tweedyi

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) 750 1019 1726
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]
5 6 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: ESSF(1), IDF(3)


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

Salix barrattiana var. tweedyi Bebb ex Rose
Salix rotundifolia Trautv.

Taxonomic and Nomenclatural Links

Additional Photo Sources

General References