bluebonnet

noun

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