blue bonnet

Noun

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