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Easily distinguished from the Western swallowtail butterfly by their pale yellow or white-cream color. Also, their black tiger stripes and borders are thicker. The wingspan is typically 3.5 to 4.5 inches (8.9 to 11.4 cm).
Spotted feeding on Rocky Mountain iris (Iris missouriensis) in eastern Washington. Cascade foothills around 2000 ft a.s.l.
Host plants include members of the genus Ceanothus, including buckbrush, mountain balm, and mountain lilac, as well as red alder, ocean spray, bitter cherry, and serviceberry species. Ranges in much of western North America.