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