Pieris marginalis (margined white) is a butterfly species seen across the coast of Western North America. It is a canopy generalist who feeds on the plant family of Brassiceae. The species is unique as it has been seen near and away from disturbed habitat; indicating an adaptation for habitat generalization.
The summer form is purely white, while the spring form has black-tipped upper forewing. The underside of hindwing and the apex of forewing have veins edged with yellow-green or gray-green. The wingspan ranges from 1 1/2 to 2 1/4 inches (3.8 to 5.7 centimeters).