some kind of rabbitbrush
I'm sure this is rabbitbrush, I'm just not so sure of the species.
Ericameria is a genus of shrubs in the daisy family known by the common names rabbitbrush and goldenbush. These are deciduous shrubs similar to sagebrush with a native range in the arid western United States and Mexico. They are known for its bright white or yellow flowers in late summer. Ericameria nauseosus, a synonym of Chrysothamnus nauseosus, is known for its production of latex.