Page authors: Don Knoke, David Giblin
Petasites japonicus
Japanese sweet coltsfoot

Distribution: Occurring west of the Cascades crest in Washington; southwestern British Columbia to Oregon.

Habitat: Forest edge, typically where moist and disturbed; generally escaping from cultivation.

Flowers: June-September

Origin: Introduced from Asia

Growth Duration: Perennial

Conservation Status: Not of concern

Pollination: Bees, flies, beetles, wasps


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Accepted Name:
Petasites japonicus (Siebold & Zucc.) Maxim.
Publication: Award 34th Demidovian Prize 212. 1866.

Synonyms & Misapplications:
Petasites japonicus (Siebold & Zucc.) Maxim. var. giganteus (F. Schmidt ex Trautv.) G. Nicholson [HC2]
Petasites japonicus (Siebold & Zucc.) Maxim. var. japonicus
Additional Resources:

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

WA Flora Checklist: Petasites japonicus checklist entry

OregonFlora: Petasites japonicus information

E-Flora BC: Petasites japonicus atlas page

CalPhotos: Petasites japonicus photos

8 photographs:
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