Fruit
Aggregate fruits

An aggregate fruit is also called an aggregation, or etaerio; it develops from a single flower that presents numerous simple pistils. Each pistil contains one carpel; together, they form a fruitlet. The ultimate (fruiting) development of the aggregation of pistils is called an aggregate fruit, etaerio fruit, or simply an etaerio.

Different types of aggregate fruits can produce different etaerios, such as achenes, drupelets, follicles, and berries.

Some other broadly recognized species and their etaerios (or aggregations) are:

The pistils of the raspberry are called drupelets because each pistil is like a small drupe attached to the receptacle. In some bramble fruits, such as blackberry, the receptacle, an accessory part, elongates and then develops as part of the fruit, making the blackberry an aggregate-accessory fruit. The strawberry is also an aggregate-accessory fruit, of which the seeds are contained in the achenes. Notably in all these examples, the fruit develops from a single flower, with numerous pistils.
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