Arnica rydbergii is a North American species of arnica in the sunflower family, known by the common name Rydberg's arnica or subalpine arnica or subalpine leopardbane. It is native to western Canada (Alberta, British Columbia), and the western United States (Alaska, Washington, Oregon, Utah, Idaho, Montana, Utah, Wyoming, Colorado, South Dakota). Arnica rydbergii is an herb up to 35 cm (14 inches) tall. Flower heads are yellow, with both ray florets and disc florets. It grows in alpine meadows and rocky slopes at high altitudes in mountainous areas.