Wikipedia Article About Beechnut on Wikipedia Beech (Fagus) is a genus of ten species of deciduous trees in the family Fagaceae, native to temperate Europe, Asia, and North America. The leaves are entire or sparsely toothed, from 5-15 cm long and 4-10 cm broad. The flowers are small single-sex, wind-pollinated catkins, produced in spring shortly after the new leaves appear. The fruit is a small, sharply 3-angled nut 10-15 mm long, borne in pairs in soft-spined husks 1.5-2.5 cm long, known as cupules. The nuts are edible, though bitter with a high tannin content, and can be called beechmast.