Thefirst three parts all formed five primordia,and then respectively deve-loped into calyx(calyx tube and five upper part lobes),corolla(corollatube and five upper part lobes)and five stamens.
英
美
- 前三者在分化早期;均形成五个原基;以后分别发育成花萼(萼管及其上部的五个裂片)、花冠(花冠筒及顶端五浅裂片)及五个雄蕊.