Peritoma arborea
Bladderpod
Bladderpod - Isomeris arborea
Bladderpod - Peritoma arborea - is a hardy California native and the host of Pontia beckerii. Formerly placed in the Caper family (Capparaceae), it is now considered a member of the Cleomaceae, which is closely related to the mustard family.

©Dennis Walker