Abstract: Paraffin cutting method was used to observe the developing process of the flower bud differentiation of Narcissus tazetta var. chinensis ‘JinZhanYinTai’ variety. The results showed that the flower bud differentiation process lasted about two months from bract primordia differentiation in early July to carpel primordia formation in mid-September. The process could be divided into 7 phases: leaf bud formation, inflorescence primordium differentiation phase, spathe primordia information phase, sepal differentiation phase, petal differentiation phase, stamen differentiation phase and pistil differentiation phase. The phase of petal differentiation was relatively long, about 20 days. In terms of changes in the external growth of flower bud, it grew much faster in the late stage than in the early stage of differentiation. Data showed that the number of inflorescence increased after the July in virtue of smoke and sustained high temperature.

Key words: Narcissus tazetta var.chinensis, flower bud differentiation, flower inflorescence, quantity