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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