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Balsamorhiza sagittata
These beauties are commonly found in mid-summer.
Judging by the leaves, I would second Gordon's suggestion of Arrowleaf balsamroot.
Could be Arrowleaf Balsamroot (Balsamorhiza sagittata), which is common in the Grand Teton National Park at this time of year. But the flowers in this family are often very similar and I have never studied this family enough to be very confident in my ID, even when I've got the plant in hand.