What is "hairbell"

Harebell \Hare"bell`\ (h[^a]r"b[e^]l`), n. (Bot.) A small, slender, branching plant ( Campanula rotundifolia), having blue bell-shaped flowers; also, Scilla nutans, which has similar flowers; -- called also bluebell. [Written also hairbell.]

E'en the light harebell raised its head.
--Sir W. Scott.

n. (alternative form of harebell English)