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Colias philodice
This butterfly may be encountered in fields, lawns, Alfalfa or Clover fields, meadows, and roadsides. Swarms of these butterflies will congregate at mud puddles. They range over most of North America with the exception of Labrador, Nunavut, and northern Quebec. Wikipedia.
UC Berkeley Botanical Gardens, Old Rose Garden, Berkeley, CA.
Spotted on a Chrysanthemum blossom.
Thanks for the ID suggestion ValB.Salares. It looks like Catopsilia pyranthe is located in South Asia, Southeast Asia and parts of Australia. The two species do look similar.