Abstract: We studied floral organogenesis and development of Lonicera maackii (Rupr. ) Maxim by using scanning electron microscope ( SEM) technique. We found that the lateral vegetative apexes transformed from one protrusion into two protrusions in mid-March, and then the two vegetative apexes simultaneously
transformed into two collateral reproductive apexes, i. e. floral primordia. The floral phyllotaxis was whorled and centripetal. Calyx, corolla, and androecium were all pentamerous, developing from calyx, corolla and androecium primordial, respectively. The single carpellary p rimordium developed into stigma, style, and ovary.The floral organogenesis and development of L. maackii were rapid and nutrition-demanding. During floral organogenesis and development, the two collateral flowers were synchronous.

Key words: Lonicera maackii (Rupr. ) Maxim, Floral organogenesis, Development, Primordia