Megasporogenesis,Microsporogenesis and Development of Gametophytes in the Rare Endangered Plant Manglietia patungensis Hu The Allozyme Diversity in Manglietia patungensis Hu Distribution and Conservation Strategy of EndangeredManglietia patungensis Hu Preliminary Studies on the Isolation of Microsatellite Loci of Manglietia patungensis (Magnoliaceae) Meiotic observations on the pollen mother cells of Manglietia patungensis, an endangered species Community Structure of Manglietia patungensis in Xiaoxi Natural Reserve,Hunan Province