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Colias eurytheme
Variable.
Urban botanical garden bordering scrub-oak/sagebrush foothills. Approximate elevation 5,000 ft.
I'm pretty sure taht this is actually an Orange sulphur (Colias eurytheme) http://www.butterfliesandmoths.org/speci...
They do look very similar but the Southern dogface has a distinctive 'sail shaped' upper wing which you can see if you check your link.