Northern Prairie Wildlife Research Center
Wyoming Rare Plant Field Guide
- Similar Species: Petasites sagittatus has a pappus of thin bristles. Osmorhiza spp. have similar fruits, but have compound leaves.
- Flowering/Fruiting Period: June-July.
- Distribution: S British Columbia to California, east to NW Montana. Disjunct in the Black Hills of South Dakota and Wyoming (Crook Co.) and the northern Great Lakes area.
- Habitat: Moist, shady birch/hazelnut woods, often on north-facing slopes in small drainages. Elev. 3400-5400 ft.
- References: Cronquist 1955; Dorn 1992 b; Fertig 1993 b; Marriott 1993 b; Ode and Marriott 1990; Van Bruggen 1985.