Distribution: Occurring on both sides of the Cascades crest in Washington; British Columbia to northern California, east to Alberta and Colorado.
Habitat: Dry meadows and open slopes at high elevations in the mountains.
Flowers: June-August
Origin: Native
Growth Duration: Perennial
Conservation Status: Not of concern
Pollination: Apomixis, bumblebees, butterflies
Perennial from short, scaly rhizomes, the stems clustered, 1-3 dm. tall.
Basal leaves petiolate, oblanceolate, 3- to 5-nerved, frequently on separate short shoots; cauline leaves opposite, 3-4 pairs, oblanceolate to lanceolate, 3- to 5-nerved, concentrated on the lower part of the stem, 3-10 cm. long and 5-25 mm. wide.
Heads solitary or few, top-shaped; involucre 9-13 mm. high, its bracts pointed, glandular on the back with hairs on the margins; rays about 8, yellow, pistillate, 1-2 cm. long; disk flowers yellow, perfect; pappus white, barbellate.
Achene densely covered throughout with short, soft hairs
PNW Herbaria: Specimen records of Arnica rydbergii in the Consortium of Pacific Northwest Herbaria database
WA Flora Checklist: Arnica rydbergii checklist entry
OregonFlora: Arnica rydbergii information
E-Flora BC: Arnica rydbergii atlas page
CalPhotos: Arnica rydbergii photos