blue bonnet

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 and Lupinus subcarnosus.