Effects of storage condition and duration on seed germination of four annual species growing in water-level-fluctuation zone of Three Gorges Reservoir Chemical constituents from Xanthii Fructus Diversity Analysis by Seed Traits and ISSR marker of Xanthium sibiricum Patrin Germplasm in Shandong Province A study on the mode of insecticidal action and the activity of detoxification enzyme in extracts of Xanthium sibiricum against Lipaphis erysimi and Mythimna separata Allelopathic potential of Xanthium sibiricum on seeds germination and seedling growth of different plants Isolation and identification of chemical constituents in Xanthium sibiricum Studies on Identification of Fruits of Xanthium sibiricum Patr,and X. mongolicum Kitag. Isolation and identification of chemical constituents in Xanthium sibiricum STUDIES ON THE MORPHOLOGY AND ANATOMY OF XANTHIUM SIBIRICUM PATRIN