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The New Flavonoids from Polygonum sphaerostachyum (Polygonaceae) A New Variety, Michelia ‘Mengyuan’ A New Variety of Michelia ‘Huahaoyueyuan’ Spatial Distribution of Gynaephora menyuanensis under Different Grazing Intensities in Alpine Meadow Herdsman‘s Perception and Influencing Factors about Grassland Ecological Environment Degradation Based on Household Investigation and Structural Equation Modeling in Sanjiangyuan Region, China Adaptability of APSIM Lucerne Model in Semiarid Area of Ningxia HPLC Analysis of Mimic Vinegar-processed Yuanbuacine Genetic diversity at chloroplast microsatellites(cpSSR)in Abies fanjingshanensis and A. yuanbaoshanensis