blue bonnet

noun5

1. •
   Any of several blue flowering plants, especially cornflower, Centaurea cyanus, and plants of the genus Scabiosa.
2. •
   (US) Any of several North American species of Lupinus common in the southwestern US, especially Lupinus texensis and Lupinus subcarnosus.
3. •
   A traditional flat Scottish hat made of blue wool; a blue tam-o'-shanter.

   • The blue bonnet, a national badge, is disappearing rapidly. — 1791
4. •
   Someone who wears such a hat; a Scotsman, especially a Scottish soldier.

   • Rob soon gathered an unco band o' blue-bonnets at his back. — 1817
5. •
   A blue Australian parrot, especially Northiella haematogaster.