Distribution: Occurring on both sides of the Cascades crest in Washington, including the Olympic Mountains and the northeastern region; Alaska to California, east to the Rocky Mountains, also in northeastern North America.
Habitat: Streambanks, moist woods and meadows from middle elevations to the subalpine.
Flowers: June-August
Origin: Native
Growth Duration: Perennial
Conservation Status: Not of concern
Perennial from a freely-rooting rhizome, 3-8 dm. tall, more or less glandular and hairy.
Cauline leaves 5-12 pairs, not much reduced upward, narrowly lance-elliptic or lance-ovate, sessile, more or less toothed, 5-12 cm. long and 1.2-6 cm. wide.
Heads several; involucre 9-15 mm. high, its bracts sharply pointed; rays 8-14, pale yellow, 1-2 cm. long; pappus tawny, sub-plumose.
Achenes sparsely hirsute and sometimes glandular.
Publication: Trans. Amer. Philos. Soc., n. s. 7: 407. 1841.
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ssp. prima – clasping arnica, streambank arnica, streambank leopardbane
Occurring on both sides of the Cascades crest in Washington, including the Olympic Mountains and the northeastern region; Alaska to California, east to the Rocky Mountains, also in northeastern North America.
PNW Herbaria: Specimen records of Arnica lanceolata in the Consortium of Pacific Northwest Herbaria database
WA Flora Checklist: Arnica lanceolata checklist entry
OregonFlora: Arnica lanceolata information
E-Flora BC: Arnica lanceolata atlas page
CalPhotos: Arnica lanceolata photos
