1. A study was carried out on the development of intersexual flowers and their location on the stalk of spinach. 2. In normal plants, the distinction between female and male flowers is found from the time of differentiation of calyx and carpel. That is, the carpel of female flower occurrs in a convex shape and the male origin develops in a hollowed one, each pursuing an independent development afterwards (Fig.1). 3. From the histological observatio'n of intersexual flowers, three types were identilfied (Fig. 2). That is, (1) the pistil and the starnen stand abreast with each other or (2) Iie one upon the other. And in the other case, (3) the stamen tissue develops in the pistil tissue. Ger!.erally the male flower develops better than the female one.