Maple

A maple was a type of tree native to Earth which was used to, among other things, make maple syrup.

Behind the scenes
At the end of The Bells of Saint John, a leaf was prominently featured that appeared to be from 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.