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  1. Oak - Wikipedia

    Oaks are hardwood (dicotyledonous) trees, deciduous or evergreen, with spirally arranged leaves, often with lobate margins; some have serrated leaves or entire leaves with smooth margins.

  2. Oak | Description, Characteristics, Types, & Facts | Britannica

    Dec 18, 2025 · Red and black oaks have bristle-tipped leaves, hairy-lined acorn shells, and bitter fruits, which mature at the end of the second growing season. Oaks can be propagated easily …

  3. Species Spotlight - Oaks (U.S. National Park Service)

    Jan 15, 2025 · Over about 56 million years, oaks have evolved into roughly 435 species that grow on five continents, about 90 of which are found in North America. A keystone species, they …

  4. 36 Different Types of Oak Trees & Their Identifying Features

    Aug 27, 2025 · That, in a nutshell, is how to describe an oak. Pun intended since oaks produce nuts. Oaks are in the Quercus genus within the Fagaceae or beech family of trees. There are …

  5. Oak Trees – Gardening Solutions

    Oaks are relatively long-lived, slow-growing trees. They vary widely in size and form, with some species resembling shrubs and others growing massive, with such impressive canopies that …

  6. How to Identify 23 Oak Trees Species | Gardener’s Path

    Aug 13, 2023 · If you want to cultivate one of your own, make sure to put it in a full sun location with well-draining soil, and be sure to read our guide to Mexican white oaks to learn more.

  7. Forests (Oaks) in North America - US Forest Service Research and ...

    In North America, oaks (Quercus, Fagaceae) are the most abundant and diverse woody plants and one of the most highly valued, important forest trees as measured by provision of …

  8. Oak - New World Encyclopedia

    Oaks have spirally arranged leaves, with a lobed margin in many species; some have serrated leaves or entire leaves with a smooth margin. Small flowers are produced in spring.

  9. Guide to Common Oak Tree Species - Treehugger

    Jul 3, 2024 · Read on for facts about oak trees, including common species, how to identify oaks by their leaf shape, planting tips, and where you can see the longest-living oak tree in America.

  10. Oaks | Encyclopedia.com

    Oaks (Quercus spp.), members of the Beech family (Fagacea), are trees and shrubs having simple, alternate leaves. Characterized by their strong, complex wood, wind-pollinated flowers, …