Info on this book, its focus, and its authors, can be found at this Univ. of Calif. Extension link
The book, including index, is 294 pages. The initial 8 chapters (126 pp.) focus on ecology, natural history, and family-by-family profiles of California bee taxa. Chapter 9 (pp. 127-144) addresses flowers and their relationship to bees. The remainder of the book focuses how to make home and other gardens more bee friendly to promote healthy and diverse urban/suburban bee populations. There are many fine photos.
Amazon.com link for the book