Maple

A maple was a type of tree native to Earth which was used to make maple syrup. Its wood was used to make a variety of objects. According to Alan Turing, the Eighth Doctor once had an umbrella with a handle made of maple, shaped like a duck's head. (PROSE: The Turing Test)

Behind the scenes
At the end of The Bells of Saint John, a leaf was prominently featured that appeared to be that of a maple. However, as revealed in The Rings of Akhaten, the leaf came from suburban England and was thus more likely to be that of a plane tree (genus Platanus). In any event the leaf type was never actually stated on screen.