A carpel consists of three parts, namely stigma, style and ovary. 

Ovary is the enlarged basal part, on which lies the elongated tube, the style. The style connects the ovary to the stigma. 

A dissected flower of Hibiscus showing a pistil (other floral parts have been removed).

Multicarpellary, syncarpous pistil of Papaver - more than one pistil, fused pistils.

A multicarpellary, apocarpous gynoecium of Michelia. When more than one carpel is present, they may be free (as in lotus and rose) and are called apocarpous

A typical anatropous ovule - (megasporangium), where the micropyle and funicle are side by side.