Field Maple is a small tree with a mature height of 20-40 feet  and indeginous to the United Kingdom. In young trees the pale brown bark is rough and deeply fissured, with age it becomes smooth. Leaves are small, light green and always in pairs opposite one another. Flowers develop into pairs of broad-winged 'keys' or 'helicopters' amongst childeren. Sometimes in late summer these keys take on a colouring of deep crimson, afterwards browning as they ripen.