Ginkgo (Ginkgo biloba), also known as the Maidenhair Tree after Adiantum, is a unique species  of tree  with no close living relatives. The ginkgo is classified in its own division , the Ginkgophyta, comprising the single class Ginkgoopsida, order Ginkgoales, family Ginkgoaceae , genus Ginkgo and is the only extrant species  within this group.