Size: 2.25 - 3 inches wingspan
Key ID features: Above, white, gray/translucent wings with red spots, and all-black or nearly all-black antennae. Same general pattern below, but HW below often has additional red patches basally, and red spots in the median area usually have pink centers.
Similar species: Mountain Parnassian (Parnassius smintheus), which is smaller, and has boldy black/white barred antennae.
Host plant: Pacific Bleeding Heart (Dicentra formosa).
Habitat: Mountain meadows and moist, open mountain woodlands, occasionally in lowlands.
Range: Western Oregon, Blue Mountains, Ochocos, Warner Mountains.
Season: late May to late August
Conservation Status: Secure