Embryology of a Tibetan Medicine Halenia elliptica Chemical constituents of Halenia elliptica Determination of Active Priniple of Yiganning Tablet by 2nd Derivative Spectroscopy Identification of new chemical constituents of Tibetan medicinal herb Halenia elliptica Three New Glycosides from Halenia clliptica Xanthone glycosides from Tibetan herb Halenia elliptica A STUDY ON ANATOMICAL CHARACTERISTICS OF LEAVES AND STEMS OF FIVE ALPINE PLANTS USED FOR TIBETAN MEDICINE IN QINGHAI-TIBETAN PLATEAU Determination of xanthones in Tibetan herb Jiadiranguo