Page authors: Don Knoke, David Giblin
Petasites frigidus
WTU specimens
Other herbaria

Distribution: Occurring in forested and mountainous areas throughout Washington; Alaska south to California, east across the northern half of North America to the Atlantic Coast; circumboreal.

Habitat: Wet meadows and damp woods.

Flowers: March-July

Origin: Native

Conservation Status: Not of concern


Perennial from a creeping rhizome, 1-5 dm. tall, sub-dioecious, the flowers appearing before or with the leaves.


Leaves all basal, large, long-petioled, palmately veined, up to 4 dm. wide and long, glabrous above and loosely white-woolly below, lobed or coarsely toothed or both; the stem with several parallel-veined bracts, 2.5-6 cm. long, reduced upward.


Heads several to many in a somewhat congested inflorescence; involucre 5-9 mm. high, the bracts equal and in a single series; flowers in the female heads pistillate and fertile, whitish and rayless, the corolla filiform; flowers in the males heads sterile, whitish, with short rays.

Accepted Name:
Petasites frigidus (L.) Fr.
Publication: Summa Veg. Scand. 182. 1845.

Synonyms & Misapplications:
(none provided)
var. frigidus    High elevations, both sides of the Cascades and in the Olympics
var. palmatus    Sea level to moderate elevations, west side of the Cascades, British Columbia to Oregon
var. sagittatus    Alaska south to NE Washington and east through Montana and Canada.
Additional Resources:

PNW Herbaria: Specimen records of Petasites frigidus in the Consortium of Pacific Northwest Herbaria database.

WA Flora Checklist: Petasites frigidus checklist entry.

E-Flora BC: Petasites frigidus atlas page.

CalPhotos: Petasites frigidus photos.

USDA Plants: Petasites frigidus information.

77 photographs:
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