Arnica gracilis

Arnica gracilis is a North American species of arnica in the sunflower family, known by the common name smallhead arnica. It is native to western Canada (Alberta, British Columbia) and the northwestern United States (Washington, Oregon, Idaho, Montana, Wyoming, north-central Colorado (Jackson County), and northern Utah (Cache, Summit, + Daggett Counties).
"Arnica gracilis" is an herb up to 30 cm (12 inches) tall. Flower heads are yellow, with both ray florets and disc florets.