Molecular identification of Aucklandiae Radix, Vladimiriae Radix, Inulae Radix, Aristolochiae Radix and Kadsurae Radix using ITS2 barcode Notes on taxonomy of Aristolochia impressinervis C. F. Liang(Aristolochiaceae)from Vietnam STUDY ON KARYOTYPE OF SAROMAOLIVER(ARISTOLOCHIACEAE)AND ITS SYSTEMATIC SIGNIFICANCE The Geographical Distribution and the System of Aristolochiaceae Pollen Morphology of Asarum in China