This is what is blooming in my garden but I know you didn't come to see what you can see in your own or your neighbor's garden. (click on photos to enlarge and read plant names)
Here are some of the flowers I have seen lately on my walks. I've read that before Europeans came to California the central valley and foothills were ablaze with color in the spring. Agriculture and urbanization have wiped out most of the natural habitat in the valley while over grazing and exotic species have caused a dramatic decline of the native plants in the foothills.
I neglected to get a picture of the common fiddle neck. They are indeed common and can be found in many areas around California.