Growth,Photosynthesis and Fluorescence Characteristics of Begonia fimbristipula and Gynura divaricata under Different Light Conditions Chemical constituents in ethyl acetate extract from aerial part of Gynura divaricata Isolation, purification and identification of polysaccharides from Gynura divaricata Advances in studies on active constituents from plants of Gynura Cass. and their pharmacological activities