Abstract: The floral organogenesis of Asarum splendens(Maekawara)C.Y.Cheng et C.S.Yang was observed under scanning electron microscope.Floral primordia were initiated in a whorled and centripetal pattern:the two whorls of three perianths were initiated first and then the two whorls of six stamens and one whorl of six carpels.During the developmental process of two alternating whorls of perianth primordia,only the outer(initiated firstly)whorl developed completely,and the inner whorl(initiated secondly)stopped differentiating gradually.The inception of two whorls of stamen primordia was centrifugal:the inner whorl was initiated firstly with every two primordia in front of each perianth primordium of the first whorl,and the outer whorl was initiated secondly,alternating with the first whorl of stamen primordia.The capel primordia were alternating with the inner whorl stamen primordia.