Santa Barbara Field Guides – Butterflies|
wingspread 1.5-2 in.|
Recognition: Bright yellow (not orange like C. eurytheme) with outer black border along wing edges.
Flight period: Adults are active from March to May and June to August (two broods).
Hostplants: The larva feeds on wild legumes (Fabaceae), including milk vetches, golden banner, and a variety of lupines.
Habitat: Found in open areas, meadows, low fields, canyons, and coastal ridges.
Distribution: Colias alexandra is found throughout the western U.S., primarily in inland areas. Harford's Sulphur is generally considered a southern California subspecies of this widespread species.