Common chickweed  (Stellaria media)

Annual: lives or grows for just one year.
Anthers: part of the stamen (the male reproductive organ of a flower) that produces pollen. (See http://www.rbgkew.org.uk/ksheets/pdfs/flower.pdf for a fact sheet on flower structure)
Neolithic: a cultural period of the Stone Age, which began around 10,000 B.C. The Neolithic is characterized by the making of polished stone tools and the development of agriculture.
Perennial: plants that live for at least three seasons; after an initial period they produce flowers once a year.
Stamens:  the male reproductive organ of a flower, it is made up of an anther (the pollen-producing organ) and a filament (stalk). (See http://www.rbgkew.org.uk/ksheets/pdfs/flower.pdf for a fact sheet on flower structure).
Tap root: a large central root.

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. Mabey, R. (1996) Flora Britannica. Sinclair-Stevenson, London.
   
5. Press, B. & Gibbons, B (1993) Photographic field guide to wild flowers of Britain and Europe. New Holland Publishers (UK) Ltd, London.