Hypericum perforatum
Amentoflavone is a biflavonoid ("bis"-apigenin coupled at 8 and 3' positions, or 3′,8′′-biapigenin) constituent of a number of plants including "Ginkgo biloba", "Chamaecyparis obtusa" (hinoki), "Hypericum perforatum" (St. John's Wort) and "Xerophyta plicata".