Bistort aka Mountain Dock (Polygonum bistortoides)
We’ve also seen this called American Bistort, Mountain Meadow Knotweed, and (no kidding) Smokeweed.
Several sources report Native Americans (especially Alaskan Eskimos) cooking and eating the starchy roots. Young leaves can be eaten as greens. This is a very common flower in the western mountains, sometimes mixing with other wildflowers, and sometimes in a homogenous grouping, as below, on Washington’s Silver Star Mountain.