Beaverhead County, Montana | Beaverhead County | Beaverhead River |
The upper Jefferson extends from the confluence of the Big Hole and the Beaverhead rivers approximately 44 miles downstream to the community of Cardwell.
Hybrids with S. bebbiana are known from Montana (collected from Beaverhead County); those with S. pedicellaris are known from Washington; and those with S. irrorata and S. ligulifolia are known from Arizona.