Optimization of SRAP-PCR System for Opisthopappus taihangensis(Ling) Shih by Uniform Design Effect of Adjustment for Inorganic Salt Contents on Adventitious Buds Proliferation and Growth of Opisthopappus taihangensis in vitro ITS Sequence Analysis of Opisthopappus taihangensis and O. longilobus Morphology and Germination Features of Achenes of 12 Species of the Genus Saussurea (Asteraceae) in Western Sichuan Plateau Karyological studies on two species of Compositae from the Hengduan Mountains, SW China