The top of the style, where pollen enters the pistil.

Parts of a flower.

A perfect flower has functional male parts (stamens) and female parts (pistils). 

Pistil: The female part of a flower, consisting of a stigma, a style and an ovary.

Stigma: The top of the style, where pollen enters the pistil.

Style: The part of the pistil between the ovary and the stigma.

Ovary: The enlarged lower part of a pistil, enclosing the ovules or young seeds.

Stamen: The male reproductive organ of a flower.

Anther: The part of the stamen that contains pollen.

Filament: The stalk of a stamen.

Pollen: Male spores produced in the anthers of a flower.