From Oregon Flora, Gardening with Natives:
Narrow-leafed wyethia, also known as narrowleaf mule's ear, has lanceolate leaves that can grow up to 2 feet long. It is an interesting alternative to more common asters with its showy yellow flowers, lush leaves, and relatively low stature. It prefers full sun and well-drained soils and adds lovely color to meadowscapes or open woodland gardens. This perennial dies back completely in the winter and can be slow-growing.
- Willamette Valley