Paper birch (Betula papyrifera) belongs to Betulaceae (the Birch family). It is a tall deciduous tree that is native to northern North America. This tree grows on open slopes, avalanche tracks, swamp margins and in bogs, and it can reach up to 18 m in height. The bark is white to reddish-brown, with dark horizontal lenticles. It peels in papery strips, exposing reddish-orange inner bark which will gradually turn black with age. The leaves are ovate with a doubly serrate margin, and arranged in alternate. The flowers are either male or female and are in narrow catkins, and they appear before or at the same time as the leaves. The fruits are winged nutlets, and mature in the fall.