Megasporogenesis,development of female gametophyte of Manglietia insignis(Magnoliaceae) The Dynamic Life Table at Seedling Stages for Manglietia yuyuanensis and M. insignis Pharmacognostical Studies on Flos Houpo Produced in Yunnan Province Studies on the Formation of Microspores and Development of Male Gametes in Manglietia insignis