I Dunno Idaho by bdunn02

Question 12

According to a long-lived myth, the border between Idaho and Montana was originally supposed to follow the continental divide, but instead now follows a given mountain range due to surveyor error. Along what mountain range, a sub-range of the Rockies named for the edible herb Lewisia rediviva (sugar would help get it down), does the Idaho-Montana border lie?

Bitterroot Range