Flower pistil. Coloured scanning electron micrograph (SEM) of a flower pistil. The pistil is the female reproductive part of the flower. It is made up of the ovary at the base of the pistil (bumpy structure), the style (projection) and the stigma (tip of projection). The stigma is where the pollen (male reproductive cells) land during pollination. The pollen can then fertilise the ovary at the base of the pistil.