Distribution: Occurring both sides of the Cascades, including the northeastern corner of Washington; Alaska to California, east to the Rocky Mountains, east across Canada to the Atlantic Coast.
Habitat: Meadows and wet places from middle elevations to the subalpine.
Flowers: June-September
Origin: Native
Growth Duration: Perennial
Conservation Status: Not of concern
Pollination: Apomixis, bumblebees, butterflies
Perennial from long, naked rhizomes; stems solitary, 2-10 dm. tall; herbage variously pubescent, becoming glandular above.
Leaves opposite, sessile, 5-10 pairs, only slightly reduced upward; leaves lanceolate to oblanceolate, entire or slightly toothed, 5-30 cm. long and 1-4 cm. wide.
Heads several, the involucre 8-12 mm. high, the herbaceous bracts sub-equal, usually obtuse, with a tuft of long, white hairs; ray flowers pale yellow, usually 13, pistillate, 1.5-2 cm. long; disk flowers yellow, perfect; pappus somewhat tawny, barbellate.
Achene with short hairs, somewhat glandular.
PNW Herbaria: Specimen records of Arnica chamissonis in the Consortium of Pacific Northwest Herbaria database
WA Flora Checklist: Arnica chamissonis checklist entry
OregonFlora: Arnica chamissonis information
E-Flora BC: Arnica chamissonis atlas page
CalPhotos: Arnica chamissonis photos