Flower anatomy. Illustration of parts of a flower, seen in longitudinal section. The flower is borne on a stalk, with the floral parts attached to a thickened receptacle. Sepals (green) are leaf-like structures that enclose and protect the flower when it is still a bud. Larger petals (red) are usually brightly coloured and may serve to attract pollinators. Within the petals are the male stamens, each made up of a filament and an anther bearing pollen. At centre is the female ovary (here cut through) bearing one or more ovules which may become seeds. The ovary has a long style with a stigma at its tip.