Noun: old-maid's bonnet
- Stout perennial of eastern and central North America having palmate leaves and showy racemose blue flowers
"old-maid's bonnet carpeted the meadow with its brilliant blue spikes";
- wild lupine, sundial lupine, Indian beet, Lupinus perennis
Derived forms: old-maid's bonnets
Part of: genus Lupinus, Lupinus