|In blackberries, the fruit is an|
aggregate of many simple fruits
mounted on a common receptacle,
as in a strawberry, but the individual
carpels become fleshy rather than the
|An apricot, like a plum, cherry, or peach,|
develops from a single carpel.
Apples (genus Malus) and plums (genus Prunus) are also in the Rose Family, and their flowers are similar to those of strawberries and blackberries. Apples are different in that tissues from the receptacle expand on the outside of the carpels to become the edible portion. If you bite too deeply into the apple (or pear) you encounter the hard inner wall of the true fruit and the seeds within. The plum (or apricot, cherry, or peach) is more like the blackberry, except that there is only one carpel in each flower. The carpel wall expands to form the edible tissue, and so is a true fruit.