The Collaborative International Dictionary
Bluebell \Blue"bell`\, n. (Bot.)
A plant of the genus Campanula, especially the Campanula rotundifolia, which bears blue bell-shaped flowers; the harebell.
A plant of the genus Scilla ( Scilla nutans).
Wikipedia
Campanula rotundifolia (harebell) is a herbaceous perennial flowering plant in the bellflower family Campanulaceae. It has a circumpolar distribution in the Northern Hemisphere, from about latitude 40° N to about 70° N, extending in Europe from the north Mediterranean to the arctic.
In Scotland, it is often known as the bluebell. Elsewhere in Britain, bluebell refers to Hyacinthoides non-scripta, and in North America, bluebell refers to Virginia bluebell. Campanula rotundifolia was historically also known by several other names including blawort, hair-bell, lady's thimble, witch's bells, and witch's thimbles.