Himalayan balsam  (Impatiens glandulifera)

Annual: lives or grows for just one year.

1. National Biodiversity Network Species Dictionary (September 2003):
   http://www.nhm.ac.uk/nbn
   
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) New Atlas of the British and Irish Flora. Oxford University Press, Oxford.
   
4. Mabey, R. (1996) Flora Britannica. Sinclair-Stevenson, London.
   
5. Grigson, G. (1996) The Englishman’s Flora. Helicon Publishing, Ltd., Oxford.
   
6. The Washington State Noxious Weed Control (December 2003):
   http://www.nwcb.wa.gov/weed_info/policehelmit.html
   
7. Impatiens glandulifera. Habitas.org (December 2003):
   http://www.habitas.org.uk/flora/species.asp?item=3189