Here are many of the common native plants in the Los Angeles area.
I've not included the little weird ones but focused on the plants that are in the trade and you should be able to see native in the wild.
Most of these plants are native from Santa Monica, through Malibu, into Los Angeles and maybe as far north as Thousand Oaks and east to maybe Pasadena. Many are native to all of Coastal Southern and even Central California.
Most plants have a web page and photos for each. We could use help with the few that are missing pictures if you wish to donate a photo.