Almost a third of oak species are threatened with extinction due to climate change, invasive pests, and habitat loss. In culture, the oak tree is a symbol of strength and serves as the national tree of many countries. In Indo-European and related religions, the oak is associated with thunder gods.

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Oak, genus of about 450 species of trees and shrubs in the beech family (Fagaceae), distributed throughout the north temperate zone and at high altitudes in the tropics. Oak species are characterized by alternate, simple, deciduous or evergreen leaves with lobed, toothed, or entire margins.

A visual identification guide to oak trees, including pictures of oak leaves, bark, and acorns to assist you in identifying the correct type of oak tree.

Oak wood is strong, hard, and tough; has good working characteristics; and is used extensively for furniture, flooring, paneling, ties, and cooperage. Oaks (Quercus spp.) are widely distributed throughout the Eastern United States and are an important source of wood and fiber.

Oaks appear so often in the story of humanity that it could scarcely have been written without them - literally. From as early as the 4th century, ink in much of the world was made from oak galls, or “oak apples”, formed when a wasp’s eggs are laid in oak leaves.