A Novel C30 Sterol from Porana racemosa Distribution of the cytoplasmic DNA in male cells of the Convolvulaceae and its systematic significance Chemical constituents from aerial parts of Argyreia seguinii A Taxonomy Study on the Species Complex of Pharbitis nil(Convolvulaceae) Revision and additional notes on Merremia boisiana and M.boisiana var.fulvopilosa(Convolvulaceae) Phytoecdysones from Parana discifera Phenolic Compounds from Merremia boisiana (Convolvulaceae) Micromorphological Features of the Seed surface of Porana s.l. (Convolvulaceae) from China and Its Taxonomic Significance New Taxa of Convolvulaceae from China