中文摘要：

以弯齿盾果草不同发育时期的花芽为材料,在体视显微镜解剖观察的基础上使用扫描电镜对弯齿盾果草花序、花及果实的发育过程进行了观察。结果显示：（1）弯齿盾果草的花序是由最初的一个球形花序原基经过多次分裂形成的,且花序发生式样符合蝎尾状聚伞花序结构,而非通常所描述的镰状或螺状聚伞花序;花序发生过程中无单一主轴,花序轴是由侧枝连接而成,每一朵花原基有其对应的1枚苞片,下一花原基是从相邻的上一枚苞腋里发生,相邻两花原基交错互生。（2）花器官的发生是按照花萼原基、花冠原基、雄蕊原基和雌蕊原基的顺序发育,但雄蕊原基的花药部分发育速度要比花冠原基快,所以花器官的发育是按照花萼、雄蕊、花冠和雌蕊的顺序发育。（3）子房四深裂结构是由4个原基分别发育,而后相互靠拢而成。（4）小坚果表面的附属结构发生于子房发育后期,其背面的内外层突起分别是由生长较快的外部组织的边缘通过上部内缩和下部向外环状生长形成。

英文摘要：

The morphogenesis of inflorescence,flower and fruit of Thyrocarpus glochidiatus was observed under stereomicroscope and scanning electron microscope（SEM）.The results showed：（1）The inflorescence of T.glochidiatus came from the splits of the first spherical inflorescence primordium,and its development way conformed to the cincinnus rather than drepanium or bostryx.And the floral primordium in the inflorescence formed one after one and every floral primordium has a subtending bract primordium.Floral primordium initiated in the axil of last bract.Two adjacent floral primordial were alternate.（2）The pentamerous flowers were typically tetramerous and the floral organs initiated in centripetal order：calyx primordia,corolla primordia,androecium primordia,gynoecium primordia;though the androecium primordia appeared after the corolla primordia,they grew quicker than the latter,so the floral organs developed in incompletely centripetal order：calyx primordia,androecium primordia,corolla primordia,gynoecium primordial.（3）The ovary with four deep clefts had formed in the early stage of gynoecium primordium.（4）The two layers of the nutlet were formed by the upper part of the marginal organization growing inward and upward and the base growing circumferential tissue outside.