Ash  (Fraxinus excelsior)

Coppicing: traditional form of woodland management in which trees are cut close to the base of the trunk. Re-growth occurs in the form of many thin poles. Woodlands are cut in this way on rotation, producing a mosaic of different stages of re-growth.
Deciduous: a plant that sheds its leaves at the end of the growing season.
Leaflets: the individual 'leaf-like' parts of a compound leaf.
Pinnate: in plants, a compound leaf where the leaflets (individual 'leaves') are found on either side of the central stalk.
Sepals: a floral leaf (collectively comprising the calyx of the flower) that forms the protective outer layer of a flower bud. (See http://www.rbgkew.org.uk/ksheets/pdfs/flower.pdf for a fact sheet on flower structure).
Styles: an elongated part of the female reproductive organs of a flower that bears the stigma (the receptive area where pollen germinates), usually at its tip. (see http://www.rbgkew.org.uk/ksheets/pdfs/flower.pdf for a fact sheet on flower structure)

1. National Biodiversity Network Species Dictionary (Feb 2003):
   http://www.nhm.ac.uk/nbn
   
2. Humphries. C.J., Press, J.R. & Sutton, D.A. (2000) Hamlyn guide to trees of Britain and Europe. Hamlyn, London.
   
3. Godet, J. (1986) Collins photographic guide to the trees of Britain and northern Europe- a guide to identification by leaves and needles. William Collins Sons & Co. Ltd, London.
   
4. Press, B. (1996) Collins Wild Guide: Trees. Harper Collins Publishers, London.
   
5. Mabey, R. (1996) Flora Britannica. Sinclair-Stevenson, London.