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

Hieracium scouleri Hook.
Scouler's hawkweed (hound's-tongue hawkweed)
Asteraceae (Aster family)

Introduction to Vascular Plants

© 3CDSG DND  Email the photographer   (Photo ID #21313)

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Distribution of Hieracium scouleri
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Species Information

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Perennial herb from a short, often stout rhizome; stems erect, simple, solitary or few, nearly glabrous, exuding milky juice when broken, 30-100 cm tall.
Basal leaves persistent, lanceolate to oblanceolate, narrowed to a stalk, 8-25 cm long, 1-3 cm wide; glabrous or with long, bristly hairs and sparse starlike hairs, entire or nearly so; stem leaves few to several, lower ones similar to the basal, the upper ones reduced.
Heads with strap-shaped flowers, few to many in a flat to rounded inflorescence; involucres 7-12 mm tall; involucral bracts linear to linear-lanceolate, more or less densely bristly-hairy with long, glandless black-based bristles and obscure starlike hairs, sometimes also with gland-tipped, blackish bristles; ray flowers yellow.
Achenes ribbed, 3-3.5 mm long; pappus whitish to tawny.
Until recently (Douglas 1986), the three varieties treated here were recognized at the specific level, although a number of taxonomists (Cronquist 1955, Guppy 1978) had previously suggested that they were probably better treated as infraspecific taxa. The three taxa are separated mainly by the density of bristly hairs on the plants (Guppy 1978). They may be distinguished as follows:

1. Bristly hairs 5-6 mm long, abundant throughout and often obscuring the glandular and starlike hairs of the involucre.................. var. albertinum (Farr) G.W. Dougl. & G.A. Allen

1. Bristly hairs 2-3 mm long, lacking or sparse throughout and rarely obscuring the glandular and starlike hairs of the involucre. 2. Leaves and stems usually nearly glabrous, often glaucous; involucral bracts sparsely to moderately hairy with glandular and starlike hairs..................... var. scouleri

2. Leaves and stems hairy with bristles; involucral bracts conspicuously hairy with glandular and starlike hairs..................... var. griseum (Rydb.) A. Nels.

Source: The Illustrated Flora of British Columbia

USDA Species Characteristics

Flower Colour:
Blooming Period:
Late Spring
Fruit/Seed characteristics:
Colour: Brown
Present over the Summer
Source:  The USDA

Habitat / Range

Mesic to dry grasslands, shrublands and forest openings in the steppe and montane zones; common in SC and SE BC; E to AB and S to UT and CA.

Source: The Illustrated Flora of British Columbia


Ecological Framework for Hieracium scouleri

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) 60 1078 2300
Slope Gradient (%) 0 33 115
Aspect (degrees)
[0 - N; 90 - E; 180 - S; 270 - W]
1 189 360
Soil Moisture Regime (SMR)
[0 - very xeric; 4 - mesic;
8 - hydric]
0 2 5
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(4), ESSF(69), ICH(35), IDF(168), MS(33), PP(33), SBS(1)


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

Hieracium albertinum
Hieracium scouleri var. griseum (Rydb.) A. Nelson
Hieracium scouleri var. scouleri Hook.

Taxonomic and Nomenclatural Links

Additional Photo Sources

General References