A plant of the genus Campanula, especially the Campanula rotundifolia, which bears blue bell-shaped flowers; the harebell.
- Any of several bulbous plants of the genus Hyacinthoides (syn. Endymion) in the lily family, native to western Europe and northwest Africa and having racemes of usually blue to pink bell-shaped flowers. Also called wood hyacinth.
- Any of numerous plants of the genus Mertensia, native to Asia, Europe, and North America and having blue, trumpet-shaped flowers.
- See harebell.
- Any of several other plants having bluish, usually bell-shaped flowers.