Ginkgo, also called a maidenhair tree, is a member of the order Ginkgoales, the oldest living species of gymnosperm. Ginkgos flourished throughout the world during the Mesozoic era (245–274 million years ago). The only surviving species is Ginkgo biloba. It has fan-shaped leaves, small, foul-smelling fruits and edible, nut-like seeds. Height: to 30 meters (100 feet).