Ginkgo Leaves

Photograph by TongRo Image Stock/Alamy

Ginkgo biloba is the only remaining species of the Ginkgoales order, which arose at the beginning of the Permian, some 280 million years ago. Also called the maidenhair tree, Ginkgo biloba trees can reach 100 feet (30 meters) in height and live more than a thousand years. Leaves from this living fossil are widely used in herbal medicines.