Reddit reviews Birds of California Field Guide (Bird Identification Guides)
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Used Book in Good Condition
For birds, you could get a bird book like Birds of California. My wife uses this for birds in our yard. We also have a pair of pocket binoculars for identifying them without scaring them off.
Flora is a little tougher, since plants aren't quite as scoped as the birds in the area. As mentioned apps on mobile devices are quite good. Short of a zoology book and having a flower from the plant and counting stamens and pistils it's tough to have a simple guide for identification (at least that I know of).
You might want to get this book - Birds of California - which will focus on the birds of your state. That and the Sibley's make a pretty solid pair.