General Description

Closely resembles the spring form of the Mustard White (P. oleracea), but the dark markings along the hindwing underside veins are broad, diffuse, and greyish-green, not well-marked, narrow and dark green as in oleracea. These two species occur together only in the foothills region. Layberry et al. (1998) assign our populations to subspecies marginalis, but Guppy & Shepard (2001) restrict this taxon to the west coast region, and assign Alberta populations to subspecies reicheli. The taxonomy of this difficult group undoubtedly requires further research.