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

Hieracium pilosella L.
mouse-ear hawkweed (mouseear hawkweed)
Asteraceae (Aster family)

Introduction to Vascular Plants

© Jamie Fenneman  Email the photographer   (Photo ID #17005)

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Distribution of Hieracium pilosella
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Hieracium pilosella ssp. micradenium

Species Information

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Perennial herb from a short, stout rhizome, stolons present; stolons mat-forming; stems erect, sticky-hairy or somewhat woolly-hairy, exuding milky juice when broken, 25-40 cm tall.
All or mostly basal, well-developed, persistent, tawny-woolly above, densely hairy beneath, the hairs starlike, 2-13 cm long, 0.6-2 cm wide; stem leaves lacking or 1-many, reduced upwards, narrowly elliptic, entire or nearly so; leaves of the stolons similar but smaller.
Heads with strap-shaped flowers, solitary or rarely 2; involucres 7-11 mm tall; involucral bracts linear-lanceolate, short, coarsely hairy with black, sometimes gland-tipped hairs and occasionally long, bristly hairs; ray flowers yellow, the outer ones often with a reddish tinge on the outer surface.
Achenes ribbed, narrowed at the base, 1.5-2 mm long; pappus tawny.

Source: The Illustrated Flora of British Columbia

Habitat / Range

Dry roadsides, lawns and waste places in the lowland, steppe and montane zones; rare in S BC; introduced from Europe.

Source: The Illustrated Flora of British Columbia


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.

Taxonomic and Nomenclatural Links

Additional Photo Sources

General References