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

Introduction to Vascular Plants

Photograph

© Province of British Columbia (Brenda Costanzo)     (Photo ID #22451)


Map

E-Flora BC Static Map

Distribution of Salix tweedyi
Click here to view the full interactive map and legend

Species Information

General:
Dioecious shrubs, 1-3 m tall, not colonial; branches erect, flexible at base; twigs yellow-brown, sparsely to densely hairy.
Leaves:
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.
Flowers:
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.
Fruits:
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.

SourceThe Illustrated Flora of British Columbia

Illustration

If more than one illustration is available for a species (e.g., separate illustrations were provided for two subspecies) then links to the separate images will be provided below. Note that individual subspecies or varietal illustrations are not always available.

Ecology

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

Avg

Min

Max

Elevation (metres)
1019 750 1726
Slope Gradient (%)
0 0 0

Aspect (degrees)
[0 - N; 90 - E; 180 - S; 270 - W]

0
Soil Moisture Regime (SMR)
[0 - very xeric; 4 - mesic;
8 - hydric]
6 5 8
Modal Nutrient Regime
Class
E
# of field plots
 species was recorded in:
4
Modal BEC Zone Class
IDF

All BEC Zones (# of stations/zone) species was recorded in

ESSF(1), IDF(3)

Habitat and Range

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

SourceThe Illustrated Flora of British Columbia

Synonyms

Synonyms and Alternate Names:
Salix barrattiana var. tweedyi Bebb ex Rose
Salix rotundifolia Trautv.