Pacific Orangetip (Anthocharis sara)
The Pacific Orangetip butterfly (Anthocharis sara) is a native species to the Pacific coast, though rarely seen. Emerging in late March and flying until around mid-May, the Pacific Orangetip can be found along the west coast from Northern Mexico to Alaska in grassy hillsides and other dry habitats.
Pacific Orangetips feed primarily on native plants in the mustard family (see here for a detailed list). The bright yellow-orange tip and marbled grayish underwings most likely help them camouflage when near their host plants.
Noteworthy: The Pacific Orangetip and the Stella Orangetip, which have slightly different coloration and range, used to be considered the same species and were called Sara Orangetip.