Abstract: An andromonoecy Diospyros kaki‘Longyan Yeshi 1’was found in the population of Longyan Yeshi. Its floral buds were three-flower cyme. The probability that the middle one was hermaphrodite floral buds was over 80%，and the two on both sides were unisexual male floral buds. It is a new excellent material for studying the regulatory mechanism of sex differentiation of Diospyros species. The developmental differences of male and hermaphrodite floral buds of‘Longyan Yeshi 1’was observed with paraffin section. The results showed that：the stamen and pistil primordia of hermaphrodite floral buds were normal. However，no ovary functional tissue was produced in the development of the pistil primordia of male floral buds. The anther of male and hermaphrodite floral buds were tetrasporangiate and the anther wall that consisted of epidermis，endotheca，middle layer and glandular tapetum was dicotyledonous development. The microspore were tetrahedral and symmetrical tetrads；Mature pollen grains were 2-cell type with three germ pores；A few abnormal pollen grain and empty pollen grain exsit at late uninucleate stage；Different or the same anther had asynchronous meiosis of microspore mother cells. The ovule of hermaphrodite floral buds had eight locules with axial placenta and anatropous ovule；The ovule was bitegmic and tenuinucellate with single spore cell. The megaspore tetrad arranged in a straight line and the functional megaspore located at the apex of the embryo sac which was polygonum type.

Key words: Diospyros kaki, andromonoecy, male floral bud, hermaphrodite floral bud, pistil, stamen, morphology