This gall on Ericameria nauseosa (Rubber Rabbitbrush) was too leafy for one of the Aciurina species and not leafy enough for Rhopalomyia ericameriae
https://www.gallformers.org/id?hostOrTaxon=Ericameria+nauseosa&type=host&detachable=&alignment=&cells=&color=&locations=&season=&shape=&textures=&walls=&form=&undescribed=false
on California Sagebrush
On Valley Oak.
On Southern Live Oak.
Shiny metallic blue weevil