- bluebonnet, buffalo clover, Texas bluebonnet, Lupinus subcarnosus - low-growing annual herb of southwestern United States (Texas) having silky foliage and blue flowers; a leading cause of livestock poisoning in the southwestern United States
--1 is a kind of lupine, lupin
- Balmoral, bluebonnet - a brimless dark blue Scottish cap with a flat top and a plume on one side
--2 is a kind of cap