Fruits are generally classified into true, spurious, and collective fruits. A true fruit may be defined as the mature ovary of a single flower. A spurious fruit is one in the formation of which other structures have taken part, while a collective fruit consists of the mature carpels of several flowers united with the bracts and floral envelopes.

True fruits may be further subdivided according as they are indehiscent or dehiscent, monocarpellary or polycarpellary.

The following classification of the most important fruits may be useful to the student for reference: