对蓖麻不同熟性类型品种的主花序分化发育过程以及主花序分化与分枝发育间的关系作了解剖分析。将蓖麻花序分化过程划分为生长锥伸长膨大、花梗分化、小花分化、花粉粒和子房形成、花粉粒充实完成等五个时期。描述了各期解剖形态特征,划定了持续时段。提出把叶余数作为花序分化发育进程的间接标准用于生产实践。 Anatomical analysis was made on the differentiation and development of main inflorescences and the relationship between the main inflorescence differentiation and branching development in castor varieties with different maturities. Castor inflorescences were divided into five stages: growth cone expansion, pedicel differentiation, floret differentiation, pollen grains and ovary formation, pollen grains enrichment completed. Describe the anatomical features of each period, defining the duration. It is proposed that the leaf residue should be used as an indirect criterion for the developmental process of inflorescence differentiation in production practice.