Bracts and bracteoles Morphology of Pleurospermum Hoffm. in Kun-Lun Mountains and Its Taxonomic Significance Taxonomic and Floristic Novelties in Chinese Umbelliferae from Qomolangma Region (Xizang, the Himalayas) Fruit Anatomical Features of Sixteen Species and One Variety of Pleurospermum (Apiaceae) in China and Their Taxonomic Significance Karyotypes of Seven Populations Belonging to Four Species of Umbelliferae in Hengduan Mountains Studies on Chemical Composition of Pleurospermym rivulorum (Diels) Chemical Constituents of Pleurospermum govanianum (Wall ) Benth ex C. B. Clarke var. bicolor Wolff Taxonomy of Pleurospermum (Apiaceae) species in China based on micromorphology of fruit Determination of Three Flavonoids and Ferulic Acid in Pleurospermum hookeri C.B.Clarke var.thomsonii C.B.Clarke by HPLC Intraspecific differentiation of Pleurospermum hookeri (Apiaceae), and its interspecific relationships with two close relatives in the genus Pleurospermum Analysis of volatile components in Pleurospermum wrightianum Boissieu.by GC/MS