The
wingspan is 35–48 mm. The upperside is orange with brown basal suffusion and sometimes even purplish gray in the female, decorated with brown designs, with small scallops and a line of submarginal round dots. The hindwing forms an angle at its anterior edge. On the forewing undersides the patterns are little marked, the apex is adorned pearly spots, and the hindwing undersides are clear because they are adorned with pearlescent designs. 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. ==
Boloria napaea napaea ==