Abstract: The morphology and variation of apparatus of Heptacodium miconioides that is a national protected plant species in China were studied.The results showed that the flower and seed number in flower shoot of H.miconioides in population A with diagusting habitat were fewer than in population B with good habitat.The fruit and germ in population A varied richly for the lower percent of panicle only with basal whorls and the more percent of panicle with three whorls.The flowering and seeding improved distinctly in population B,but the embryo of adult germs were underdeveloped.Germs produced in the basal whorl of panicle I in population A was heavier than those in population B.All the results suggested that H.miconioides could grow in diagusting habitat.The sink adjustment could improvement the seed status but the effect was inapparent and it suggested that the H.miconioides had a poor nutrition adjustment by itself.The obstacle in sexual reproduction might be the main reason why H.miconioides is in endangered condition.In order to eliminate this obstacle,the population ecological adapts and renewal of germ plasm could be studied.

Key words: Heptacodium miconioides, reproductive apparatus, morphological variation, anatomise structure source-sink adjustment