The second edition of Biochemistry and Physiology of Plant Hormones has been substantially improved, not only has every chapter been revised and updated, but a new chapter on brassinosteriods has been added. This richly illustrated textbook is intended primarily for intermediate-level and advanced courses concerned with hormonal regulation of growth and development of seed plants including the hormonal regulation of flowering as well as the role of the phytochrome pigment system in the regulation of growth and development generally. There are frequent citations of the literature in the text and an even more extensive list of references at the end of each chapter, which will serve as an introduction to the voluminous historical and contemporary literature on each topic.