(DC) (US Botanic Garden) During this illuminating lecture, botanist, Distinguished Scientist and Curator Emeritus W. John Kress, Ph.D., will discuss his new book, Smithsonian Trees of North America. Ten years in the making, this comprehensive compendium takes a careful look at the diversity, morphology, and beauty of over 325 tree species. Dr. Kress will discuss the extensive research behind the book and the advanced technologies used to identify individual tree species and understand their evolutionary relationships. Join us to gain a deeper appreciation for some of the most prominent and ecologically vital plants in North America.