A simple fruit develops from a single carpel (or several fused carpels) of one flower
(examples: lemon, peanut, banana).
An aggregate fruit develops from many separate carpels of one flower
(examples: raspberry, blackberry, strawberry).
A multiple fruit develops from carpels of many flowers (examples: pineapple, mulberry, osage-orange).
An accessory fruit contains other floral parts (such as the receptacle) in addition to ovaries
(examples: apple, strawberry).