Boloria napaea

Description

Boloria napaea, the Napaea fritillary or mountain fritillary, is a butterfly of the family Nymphalidae. In Europe the species is found in the Alps, mountainous areas in northern Scandinavia and very local in the eastern parts of the Pyrenees. In North America it is found in Alaska, northwestern Canada, and in small populations in the Canadian part of the Rocky Mountains, Alberta, and Wyoming. In Asia it is found in Siberia, the Altai Mountains, and the Amur Oblast. The wingspan is 35–48 mm. The butterfly flies from June to August depending on the location. In Europa the larvae feed on Viola species, especially V. biflora and also Polygonum viviparum. In North America it also feeds on Polygonum bistortoides.