Bluebonnet

noun

1. A traditional flat Scottish hat made of blue wool; a blue tam-o'-shanter.
2. Someone who wears such a hat; a Scotsman, especially a Scottish soldier.
3. Any of several blue flowering plants, especially cornflower, Centaurea cyanus, and plants of the genus Scabiosa.
4. A blue Australian parrot, especially Northiella haematogaster.
5. Any of several North American species of Lupinus common in the southwestern US, especially Lupinus texensis and Lupinus subcarnosus.