Image Credit: Selwyn Quan
Identification: Upper side of male forewing with large, orange-red spot; border of apex dark, narrow. Female spot smaller; dark border with white wedges. Underside of hindwing with scattered, dark-green marbling. Late spring individuals are larger with less black and hyave yellow green marbling below. Some individuals are yellow. Less common in Portland area.
Wing Span: 1 1/16 - 1 1/2 inches (2.7 - 4.0 cm).
Caterpillar Hosts: Plants in the mustard (Brassicaceae) family especially rock cresses such as tower mustard. In California, presence of late flowering \"true\"" mustards (Brassica species) allows extended larval feeding and a partial second flight."
Adult Food: Flower nectar, including that of host mustards, thistles, fiddleneck, and brodiaeas.
Habitat: Open oak woods in hills, orchards, fields, meadows, streamcourses, canyons.