Daisy  (Bellis perennis)

Calcareous: Containing free calcium carbonate, chalky.
Capitulum: A compound flower head, consisting of many tightly packed flowers. (a type of inflorescence, the reproductive shoot of the plant, which bears flowers).
Dune-slacks: Depressions between sand dunes that are often wet during the winter.
Inflorescence: The reproductive shoot of a plant, which bears a group or cluster of flowers.
Perennial: Plants that live for at least three seasons; after an initial period they produce flowers once a year.

1. Integrated Taxonomic Information System (ITIS) (September, 2009)
   http://www.itis.gov/
   
2. Clapham, A.R., Tutin, T.G. and Moore, D.M. (1987) Flora of the British Isles. 3rd Edition. Cambridge University Press, Cambridge.
   
3. Preston, C.D., Pearman, D.A. and Dines, T.D. (2002) The New Atlas of the British and Irish Flora. Oxford University Press, Oxford.
   
4. Mabey, R. (1996) Flora Britannica. Sinclair-Stevenson, London.
   
5. Press, B. and Gibbons, B. (1993) Photographic Field Guide to Wild Flowers of Britain and Europe. New Holland Publishers (UK) Ltd, London.