An Old Earth gymnosperm tree that arose during the Permian and was common during the Mesozoic Era, with worldwide distribution. The genus declined in numbers and diversity during the Cretaceous; the remaining one or two species decreased in range during the Cenozoic, and by the Holocene there was only one existing species, Ginkgo biloba, in a small area of southern China. It has fan-shaped leaves divided into two lobes. A large number of extinct species have been lazurogened, all with the distinctive fan-shaped leaves seen in fossil remains. A popular and hardy plant.