The Missouri Botanical Garden is one of the world's largest repositories of data about plants, data that exists in several forms. It owns rare first-edition books, including medicinal plant manuals dating to the time of Gutenberg; thousands of living plants, which grow for public enjoyment on 79 acres in the center of urban St. Louis; and the 6 million-plus dried specimens — the unseen garden — which are used for studying the morphology, distribution and use of plant species worldwide. Along with samples collected by Wislizenus and his peers, the garden has collections obtained by Charles Darwin, James Cook and nearly every naturalist to travel westward in the footsteps of Lewis and Clark. All of this data, from books to scanned images to specimen labels, will be online within a few years, Freeland says. The garden is even building API tools so others can write apps to mine it all.