|There were a large number of these Arctic Fritillaries on the ridge to Black Tail Rocks at about 3000'. They flew close to the tundra floor, basking, nectaring, and mating. The sharply pointed central spot on the underwing makes the identification. Upper wing coloration is variable. They overwinter as larvae. Host plants include scrub willows and wild violets. Adults nectar on goldenrod and asters, among other flowers. I saw one nectaring on a blueberry flower. They range through much of Alaska and Canada, and further south along the Rocky Mountains.
You will find more information on this species
of butterfly here and here.