Dahlia flower pollen. Coloured scanning electron micrograph (SEM) of a pollen grain (orange) from a Dahlia cultorum flower. A pollen grain contains a male sex cell from a flowering plant. Millions of pollen grains are produced by a flower. Some of these pollen grains are transported from a flower's anthers to the female reproductive parts of a plant, in a process called pollination. This allows the female and male sex cells to combine in the formation of a seed. Dahlias are popular garden flowers.