Bougainvillea is an example of:
a flower with large colourful bracts
Bougainvillea flower is actually small but is protected by large bracts. A bract is a modified leaf or scale usually associated with reproductive structures like flowers. It is typically small with a flower or flower cluster in the axil. Flowers like bougainvillea have large coloured bracts. Another example of a bracteate flower is banana flower where bracts are dark brown coloured.
Banana bract Bougainvillea bract