Acer negundo (Box Elder)
Also known as: Ash-leaved Maple
Native: A large area of east and central N. America, where it grows on swamp and streamsides
Location: Box Elder has provided a source of sugar, or maple syrup, in the past but is now more important as an ornamental tree both in Europe and in western N. America.
Leaves have 5 leaflets. Autumn colour is clear yellow.
Male and female flowers are produced on different trees in April. Males are dense red tassels, females are drooping green clusters.
Keys have wings 3-3.7cm long.