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

Salix maccalliana Rowlee
MacCalla's willow
Salicaceae (Willow family)

Introduction to Vascular Plants

© Jamie Fenneman  Email the photographer   (Photo ID #20463)

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

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Dioecious shrubs, 1-5 m tall, not colonial; branches erect, flexible at base; twigs red- to yellow-brown, sparsely hairy or smooth.
Alternate, simple, strap-shaped to narrowly oblong, 4-8.5 cm long, 0.8-2.5 cm wide, lower surface not glaucous, smooth or hairy when young, hairs white and rust-coloured, upper surface highly glossy, smooth or hairy when young, margins toothed or entire, bases rounded to wedge-shaped, tips pointed; leaf stalks without glandular dots at top; stipules rudimentary or leaflike.
Unisexual, lacking sepals and petals, borne in catkins which flower as leaves emerge, the catkins stout, on leafy twigs; floral bracts pale, smooth or hairy, hairs wavy; stamens 2; ovaries 1, hairy; styles 0.8-1.2 mm long.
Capsules which split open to release the seeds, each of which is surrounded by a tuft of hairs; stalks 0.8-2 mm long.

Source: The Illustrated Flora of British Columbia

Habitat / Range

Wet to moist riverbanks, slough margins, marshes, fens and rocky slopes from the montane to subalpine zones; common in S BC east of the Coast-Cascade Mountains, rare northward; N to S YT and S NT, E to PQ and S to MN, ND and WA.

Source: The Illustrated Flora of British Columbia


Ecological Framework for Salix maccalliana

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) 435 1048 1846
Slope Gradient (%) 0 2 70
Aspect (degrees)
[0 - N; 90 - E; 180 - S; 270 - W]
20 228 360
Soil Moisture Regime (SMR)
[0 - very xeric; 4 - mesic;
8 - hydric]
1 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: BWBS(37), ESSF(13), ICH(10), IDF(51), MS(11), SBPS(36), SBS(27), SWB(6)


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 montane boreal & cool temperate.

Taxonomic and Nomenclatural Links

Additional Photo Sources

General References