Not all flowers with multiple ovaries form aggregate fruit; the ovaries of some flowers do not become tightly joined together to make a larger fruit. Aggregate fruits may also be accessory fruits, in which parts of the flower other than the ovary become fleshy and form part of the fruit.
The individual parts of an aggregate fruit come in many forms. Common examples are:
- Multiple fruit, a structure formed from the ovaries of several flowers, that can resemble an aggregate fruit
- Compound fruit, a term sometimes used when it is not clear whether a fruit is an aggregate fruit, a multiple fruit, or a simple fruit formed from a compound ovary
- Carpel, the "building blocks" of the ovary
- Hickey, M.; King, C. (2001). The Cambridge Illustrated Glossary of Botanical Terms. translated by. Cambridge University Press.