Arnica mollis, the soft arnica or hairy arnica, is a perennial herbaceous flowering plant in the family Asteraceae. It is native to Canada (British Columbia, Alberta, Quebec, and the territories) and the United States (Alaska south to Tulare County, California, and Rio Arriba County, New Mexico). There may be a disjunct population of this species in Coös County, New Hampshire. The species grows in subalpine mountain habitat such as meadows and streambanks.

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