Size: Up to 3 inch wingspan and larger
Key ID features: Large. Above deep maroon edged with black band with blue spots, and cream to golden marginal band with dark mottling. Below nearly black with striations and tan specks, pale tan submarginal band.
Similar species: Above, unlike any other Oregon species. California Tortoiseshell orange and black above, below is more complexly marked and shaded. Milbert's Tortoiseshell is smaller, orange bands above, and below broad band of striated brown in outer half.
Host plant: Willows, and many other shrubs and trees including alder, maple, poplar, spiraea.
Habitat: In riparian areas, and other openings, usually near water.
Range: Throughout Oregon.
Season: Early May to mid-October.
Conservation Status: Secure