As the title says: a field guide to the trees and shrubs of California. Thorough. Well researched. Most illustrations and range maps are black and white, though there are a handful of colored illustrations, in photographic plate pages at the center of the book. There are clear sets of instructions to help you sort through the entries, and find the information relevant to the plant you are observing, based upon your location, and the morphological features of the plant. A necessary reference for anyone engaged in nature study in the Coast Range Mountains of California.