Flower Structure

http://www.countrysideinfo.co.uk/flower.htm                                                                                             

A flower is basically made up of four concentric rings of structures. There is an outer ring of modified leaves called sepals. These provide protection to the flower before it opens and are usually green. This outer ring is known as the calyx.
Inside the sepals is another ring of modified leaves called petals which are often brightly coloured. This layer is known as the corolla.
Within the corolla are one or more stamens containing pollen, which are the male reproductive structures.
In the very centre of the flower are the female reproductive organs.

 Plant Lifecycle: http://www.countrysideinfo.co.uk/lifecycles/lifecyc1.htm