AdultThe Bog Fritillary is easily distinguished by the ventral hindwing. The postmedian row of spots are an even row. The spots are almost perfect circles, cream-coloured and edged with black. Subspecies C.e. nichollae is a dark form from high elevations in the Rockies.
SubspeciesThe BC populations are the widespread boreal subspecies C.e. dawsoni (Barnes & McDunnough, 1916) (TL: Hymers, ON). The subspecies C.e. nichollae (Barnes & Benjamin, 1926) is currently known only from near the Columbia Ice Field in Alberta, but adjacent habitat in BC is totally unexplored and the subspecies may be found in BC. Nichollae's Fritillary seems to be genetically distinct, not just a high-elevation form.