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Structurally and functionally, they are not different from common bracts. Bracteoles are leaf-like structures with a protection and/or atraction function, like bracts. They can differ from each other on where they are inserted.
Bracteoles are special bracts associated directly with the flowers. It is the bract that protects the early floral bud, and each flower has one or more bracteoles, but each bracteole is associated with only one flower.