ITS2 and rbcL sequence analysis on plants of Marsdenia R. Br. and its related species Study on phenylpropanoids from Dregea sinensis var. corrugata STRUCTURE OF DREGEOSIDE A FROM DREGEA SINENSIS VAR. CORRUGATA A NEW STEROIDAL COMPOUND OF DREGEA SINENSIS Two γ-Methyl Biosides from Dregea volubilis (L.) Benth The Structure of Dresgenin from Dregea sinensis var. Corrugata THE CONSTITUENTS OF C21-STEROIDS FROM DREGEA SINENSIS VAR. CORRUGATA Original plant identification of Dai nationality herb “Daibaijie” Desiccation Sensitivity of Trichilia dregeana Axes and Antioxidant Role of Ascorbic Acid