Abstract: Emmenopterys henryi Oliv, one of the China’s unique species, belongs to Rubiaceae. It is an endangered endemic single species genus plant. A detailed morphological description of megasporogenesis, microsporogenesis, and the development of the embryo in the rare endangered plant E.henryi is presented. The ovule is anatropous, single-integument, and crassinucellate. The megaspore mother cells undergo miosis and develop into a linear tetrad. The large one at chalazal end is functional megaspore and developed into a polygonum type of embryo sac after the third mitotic division. Each anther of E.henryi is with four sacs. The meioses of microspore mother cell is normal and cytokinesis is modified simultaneous type, and tetrads are tetrahedral. The pollen grains are monocolpate and two celled at shedding. The embryogeny passed through zygote, proembryo, globular embryo, heart and torpedo stages. When the seeds are ripe, embryo is not completely mature. Through the study we found that there is no abnormal phenomenon in the megasporogenesis, microsporogenesis process and the embryo stays in torpedo stage.

Key words: Emmenopterys henryi Oliv, megasporogenesis, microsporogenesis, embryo development