The pear fruit is an accessory fruit

Relating floral & fruit structures

Note the green floral tube surrounding the ovary in the pear (Pyrus sp.) flower. In pears, the ovary is sunken into the receptacle and it is the receptacle that produces most of the tissue of the pear fruit that we eat. Since most of the fruit is not developed from the ovary itself, this is called an accessory fruit.

Note the portion of the pear fruit that was developed from ovule, ovary, and receptacle. In most fruits, only the ovary wall is ripened into a fleshy fruit.

Illustration from: Berg, 1997, Introductory Botany: Plants, People & the Environment, Saunders College Publishing