Betula penula, (Variously Silver Birch, European Weeping Birch, European White Birch, or Weeping Birch) is a widespread European birch, though in southern Europe it is only found at higher altitudes. Its range extends into southwest Asia in the mountains of northern Turkey and the Caucasus. It is also found growing wild throughout much of Canada. The closely related Betula platyphylla in northern Asia and Sichuan Birch (B. szechuanica) of central Asia are also treated as varieties of Silver Birch by some botanists, as B. pendula var. platyphylla and B. pendula var. szechuanica respectively (see birch classification).