Ecological Anatomy of the Root in Bretschneidera sinensis,a Threatened Endemic Plant in China VARIATION PATTERNS ON MICRO-MORPHOLOGICAL CHARACTERISTICS OF LEMMAS OF AGROPYRON MONGOLICUM Micro-morphological Characteristics of Leaf Epdermis for Ilex kudingcha and Its Relative Species and Their Taxonomical Significance Study on Leaf Micro-morphological Characteristics of Lycoris (Amaryllidaceae) A STUDY ON THE SEEDS MICRO-MORPHOLOGICAL CHARACTERISTICS OF PEGANUM FROM CHINA NORTHWEST AND ITS TAXONOMIC AND ECOLOGICAL SIGNIFICANCE Study on the Ieaf epidermis micro-morphological characteristics of subgenus Soja in Glycine