Bracken  (Pteridium aquilinum)

Deciduous: a plant that sheds its leaves at the end of the growing season.
Leaflets: the individual 'leaf-like' parts of a compound leaf.
Nectaries: nectar-secreting glands, typically located at the base of insect-pollinated flowers. They usually attract insects to flowers, but can also attract seed dispersing insects.
Rhizome: 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.
Spores: microscopic particles involved in both dispersal and reproduction. They comprise a single or group of unspecialised cells and do not contain an embryo, as do seeds.
Vegetative reproduction: type of asexual reproduction (reproduction without recombination of genetic material) that results in the propagation of plants using only the vegetative tissues such as leaves or stems. The resulting plant is genetically identical to the original plant. A well-known example of this is the reproduction of strawberry plants from 'runners'.

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. Marrs, R. (2004) Pers. comm
   
5. Freethy, R. (1987) British ferns. The Crowood Press, Wiltshire.
   
6. Mabey, R. (1996) Flora Britannica. Sinclair-Stevenson, London.