| Rating | Solver | Clue |
|---|---|---|
| BLOWFLY | Bluebottle | |
| BLUE-BONNET | A plant. Same as Bluebottle. | |
| CENTAUREA | A large genus of composite plants, related to the thistles and including the cornflower or bluebottle (Centaurea Cyanus) and the star thistle (C. Calcitrapa). | |
| BLUETS | A name given to several different species of plants having blue flowers, as the Houstonia coerulea, the Centaurea cyanus or bluebottle, and the Vaccinium angustifolium. |