Flowers produce an aggregate fruit

Flowers produce an aggregate fruit (evolved from one flower with many pistils) called rose hips. Each pistil develops into a single fruit (achene), whereas a single fruit bundle is wrapped in flesh on the outside.

Species with wide open flowers are more inviting the arrival of bees or other insects that help pollinate so tend to produce more fruit.

Roses breeding yields flowers whose crown leaves are closed tightly making it difficult to pollinate.

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