Beech (Fagus) is a genus of ten species of deciduous trees in the family Fagaceae, native to temperate Europe, Asia and North America. F. sylvatica is the most commonly cultivated, although there are few important differences between species aside from detail elements such as leaf shape. Beeches may get to as tall as 27 meters and 18 meters in width, although usually much smaller.
The southern beeches (Nothofagus genus) previously thought closely related to beeches, are now treated as members of a separate family, Nothofagaceae. They are found in Australia, New Zealand, New Guinea, New Caledonia, Argentina and Chile (principally Patagonia and Tierra del Fuego).