Harebell  (Campanula rotundifolia)

Calcareous: containing free calcium carbonate, chalky.
Perennial: plants that live for at least three seasons; after an initial period they produce flowers once a year.
Rhizomes: rhizomes are thickened, branching, creeping storage stems. Although most rhizomes grow laterally just along or slightly below the soil's surface, some grow several inches deep. Roots grow from the underside of the rhizome, and during the growing season new growth sprouts from buds along the top. A familiar rhizome is the ginger used in cooking.

1. National Biodiversity Network Species Dictionary (Feb 2003):
   http://www.nhm.ac.uk/nbn
   
2. Clapham, A.R., Tutin, T.G. & Moore, D.M. (1987) Flora of the British Isles. 3rd Edition. Cambridge University Press, Cambridge.
   
3. Preston, C.D., Pearman, D.A. & Dines, T.D. (2002) The New Atlas of the British and Irish Flora. Oxford University Press, Oxford.
   
4. Native Wild Flowers of the North Dakota Grasslands (Feb 2003):
   http://www.npwrc.usgs.gov/resource/literatr/wildflwr/species/camprotu.htm
   
5. Mabey, R. (1996) Flora Britannica. Sinclair-Stevenson, London.
   
6. Press, B. & Gibbons, B (1993) Photographic field guide to wild flowers of Britain and Europe. New Holland Publishers (UK) Ltd, London.