Practical and well-organized. Native plants are divided into categories that are relevant to the gardener, such as "large deciduous trees", "small deciduous trees", "screening shrubs", etc.
Lots of useful pictures, and I particularly enjoyed the section on traditional garden styles and the lists of California natives that can be used to substitute for exotic plants that are usually used in those traditional garden styles. Thinking about it more, I wish that section was enlarged - a few more pages on "designing a with California natives" (insert your favorite traditional style in the <>) would have been really useful.