Birch is a broadleaved deciduous hardwood tree of the genus Betula. Birch species are generally small to medium-sized trees or shrubs, mostly of temperate climates.
The fruit is a small samara, although the wings may be obscure in some species.
The bark of all birches is characteristically marked with long, horizontal lenticels, and often separates into thin, papery plates, especially upon the paper birch. Its decided colour gives the common names grey, white, black, silver and yellow birch to different species.