Carnation flower pistil. Coloured scanning electron micrograph (SEM) of the pistil of a carnation flower (Dianthus caryophyllus). The pistil is the female reproductive part of a flower. It is composed of one or more carpels, each of which possesses a stigma, style and an ovary (not seen). The ovules in the ovary are fertilised by the male sex cells in pollen, and each carpel may then ripen to produce a fruit containing seeds. Magnification: x12 at 6x7cm size.