Subspecies Calliopsis zebrata bobbae
Monographic Study of the Genus Nomadopsis Ashmead.By Rozen, Jerome G.
University of California Publications in Entomology 15: 1-202, 1958
California Bees & Blooms: A Guide for Gardeners and NaturalistsBy Gordon G. Frankie, Robbin W. Thorp, Rollin E. Coville, Barbara Ertter
Heyday (in collaboration with the California Native Plant Society), Berkeley, California, 2014
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.