George B. Johnson, Ph.D.
Professor of Biology
Washington University
St. Louis, Missouri
AUTHORS
Peter H. Raven, Ph.D.
Engelman Professor of Botany
Washington University
St. Louis, Missouri
Director
Missouri Botanical Garden
George B. Johnson, Ph.D.
Professor of Biology
Washington University
St. Louis, Missouri
AUTHORS
Peter H. Raven, Ph.D.
Engelman Professor of Botany
Washington University
St. Louis, Missouri
Director
Missouri Botanical Garden