Fagopyrum cymosum(Trev).Meisn is one of perennial herbs of the genus Polygonaceae in the Fagopyrum Mill family, and it is an important resource plant with rich nutrition and medicinal utilization values in which the flavonoids are its main bioactive components.Man has the increas-ing demand for Fagopyrum for its superiorities. However, it is in short supply as a medical plant because of the destruction of naturalenvironment, unlimited exploiting and cult technology. So, it has important economic ...