Spectrum-effect relationship of active fraction from Hedysari Radix on improving immunity Chemical constituents from roots of Flemingia philippinensis Chemical constituents from roots of Flemingia philippinensis Studies on the Steroidal Saponins of Dioscorea tokoro Makino Collected from Zhejiang Correlation on quality and ecotype of Astragalus membranaceus var. mongholicus Two new triterpenoid saponins from roots and rhizomes of Glycyrrhiza uralensis