Dynamic Accumulation and Extracting Technology of the Total Flavonoids in Crataegus pinnatifida Leaves Separation and purification technology of main active composition of Hongye Xingtong soft capsules with macroporous resin A Study on Chemical Constituents in Seeds of Crataegus pinnatifida Bge.var. major N. E. Br. Studies on chemical constituents from fruit of Crataegus pinnatifida Genetic Diversity of Crataegus pinnatifida Bge. as Evaluated by ISSR and SSR Markers Genetic Diversity of Crataegus pinnatifida Bge. as Evaluated by ISSR and SSR Markers Seasonal Variation of Total Flavonoids from Crataegus pinnatifida and Correlation Analysis of Climatic Factors Optimization of Ultrasonic-assisted Extraction of Total Flavonoids from Crataegus pinnatifida Leaves and Its Antioxidant Activities Studies on the Chemical Constituents of the Leaves of Crataegus pinnatifida Bge. var. major N. E. Br. Comparative Analysis of Ursolic Acid in Crataegus pinnatifidav Bge. var. major N. E. Br. before and after Processing