Studies on chemical constituents from branch of Trema angustifolia ANALYSIS ON SUCCESSION TREND AND PHYSIOLOGICAL CHARACTERS OF SECONDARY FOREST TREE SPECIES IN LIMESTONE MOUNTAIN OF EASTERN ANHUI PROVINCE The Anatomy, Embryology and Systematic Relationships of Eucommiaceae A preliminary study of molecular phylogeny and biogeography distribution pattern of Zelkova inferred from trnL-trnF and nrITS sequences Phytogeography of Zelkova(Ulmaceae) A SUMMARY ON PHYTOGENETIC CLASSIFICATION OF ULMACEAE FROM CHINA The utility of trnK intron 5′ region in phylogenetic analysis of Ulmaceae s. l. Advances in studies on mansonones