The stigma of a flower is the organ equivalent to an ovary. Anthers are the male reproductive organ. When pollen from the anthers lands on the tip of the stigma the pollen will create a channel called the pollen tube that leads down into the base of the stigma which is the portion of the stigma that is truly the ovary. At the base of the stigma there is a sack like portion that contains the eggs. Fertilization continues on from here.