Hosted by the Missouri Botanical Garden, this Web site outlines Mark Olson's PhD research. The site gives an introduction to the 13 species of the tree genus Moringa that are found in Africa and Asia. Information includes descriptions of the diverse plant group and a variety of photos, along with Olson's research. The Images of the Dry Tropics section is a much broader look at some great images of the unique flora and fauna found in dry tropical habitat worldwide.