Denmark | 1979 | 25 Ore | Flora & Fauna | Quercus


Denmark

Quercus (Oak)


   



Quercus (oak) is a genus of about 600 species of trees and shrubs in the beech family (Fagaceae), native to the Northern Hemisphere. It includes both deciduous and evergreen species found from temperate to tropical regions of Asia and the Americas. North America—especially the United States and Mexico—and China are major centers of oak diversity. The name “oak” is also used for some related genera such as Lithocarpus.

Oaks typically have spirally arranged leaves, often lobed or serrated, and some deciduous species retain dead leaves until spring (marcescence). They produce male catkins and small female flowers on the same tree. The fruit is an acorn—a single-seeded nut borne in a cupule—that matures in 6–18 months. Evergreen “live oaks” are scattered within the genus rather than forming a separate group.

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