Parry’s harebell, aka Parry’s bellflower; Campanula parryi
I first saw these at Staunton State Park and then, amazingly, a month later on Aug. 6, 2024, outside our house. But on Sept. 11, 2026, I stumbled across one in the forest at 11300 feet in Dry Creek east of the Eisenhower Tunnel. The identification seems solid. The sepals are long. The Dry Creek one is in the last two pictures below.