... species of tree with no close living relatives. The ginkgo is classified in its own division, the Ginkgophyta, ... single class Ginkgoopsida, order Ginkgoales, family Ginkgoaceae, genus Ginkgo and is the only extrant species within this group.2 ... fraction, which consists of ginkgolides and bilobalides. These ginkgo flavone-glycosides have powerful antioxidant and free radical scavenging capability ...