Wild strawberry pistil. Coloured scanning electron micrograph (SEM) of the pistil of a flower of the Asian wild strawberry (Potentilla sp.). The pistil is the female reproductive part of a flower. It comprises several stigmas borne on long styles (yellow). Pollen grains, the male sex cells of a flowering plant, land on the stigmas and burrow down through the styles to the ovary, where they fertilises the ova (eggs).