A dewberry flower. Note the multiple pistils, each
of which will produce a druplet. The result will be a blackberry-like
aggregate fruit.An aggregate fruit, or etaerio, develops from a flower
with numerous simple pistils. An example is the raspberry, whose simple
fruits are termed drupelets because each is like a small drupe attached
to the receptacle. In some bramble fruits (such as blackberry) the receptacle
is elongate and part of the ripe fruit, making the blackberry an aggregate-accessory
fruit. The strawberry is also an aggregate-accessory fruit, only one in
which the seeds are contained in achenes. In all these examples, the fruit
develops from a single flower with numerous pistils.
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