(Why, you ask, is Oregon so greedy with the plant names? Well, remember that at one time, Idaho was part of Oregon Territory. The name Idaho was made up and used later.)

“The leaves may be entire, lobed, or deeply cleft into several narrow segments. Open, dry places, valleys and plains to alpine zones. Meriwether Lewis collected a specimen of this species on June 6, 1806, along the high uplands of the ‘Kooskooskee’ (Clearwater) River, near ‘Camp Chopunnish,’ or present-day Kamiah, Idaho.” (Falcon Guide, p. 108)