In the center of the flower at the top of the receptacle are the female reproductive organs: the carpels.

Each carpel consists of three specific regions:
The stigma is the reception tip of the carpel on which pollen adheres and germinates.
The style is the stalk-like tissue connecting the stigma and the ovary.
The ovary is the enlarged basal portion of the carpel which develops into a fruit. The ovary contains one or more ovules which will eventually develop into the seed(s) within a fruit.

Peas in a pod
Peas are floral ovules that have developed into seeds, while the "pod" is the mature ovary, or fruit.

There are often several carpels within a single flower. When these are fused or joined into what appears to be a single unit, that single structure is called the pistil.

Orange slices with seeds
Sections of the orange fruit form from several carpels united into a single structure, the pistil. Each orange carpel can contain one or more seeds (ovules).

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