Fruit Types Revisited: Simple, Aggregate, Multiple, Accessory
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Fruits also classify by origin: simple from one ovary, aggregate from multiple carpels, multiple from a cluster, accessory from non-ovary tissue.
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A raspberry is aggregate, carpels fused from one flower; a pineapple is multiple, fused from a cluster.
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An accessory fruit, like a strawberry, develops mainly from tissue outside the ovary — true fruit is only a small part eaten.