» Not to be confused with Birch or Beach. Beech (Fagus) is a genus of ten species of deciduous trees in the family Fagaceae, native to temperate Europe and North America. The leaves of beech trees are entire or sparsely toothed, from 5-15 cm long and 4-10 cm broad. The flowers are small single-sex (monoecious), the female flowers borne in pairs, the male flowers wind-pollinated catkins, produced in spring shortly after the new leaves appear. The bark is smooth and light gray. The fruit is a sma… (More on Beech)