Oak

An oak is a tree or shrub in the genus Quercus ( /ˈkwɜrkəs/; Latin "oak tree"), of which about 600 species exist. "Oak" may also appear in the names of species in related genera, notably Lithocarpus. The genus is native to the Northern Hemisphere, and includes deciduous and evergreen species extending from cool temperate to tropical latitudes in Asia and the Americas.

Oaks have spirally arranged leaves, with lobed margins in many species; some have serrated leaves or entire leaves with smooth margins. Many deciduous species are marcescent, not dropping dead leaves until spring. The flowers are catkins, produced in spring. The fruit is a nut called an acorn, borne in a cup-like structure known as a cupule; each acorn contains one seed (rarely two or three) and takes 6–18 months to mature, depending on species. The live oaks are distinguished for being evergreen, but are not actually a distinct group and instead are dispersed across the genus.

Read more about Oak:  Classification, Hybridization, Uses, Biodiversity and Ecology, Diseases and Pests, Toxicity, Historical Note On Linnaean Species

Other articles related to "oak":

Oak Processionary
... The Oak Processionary (Thaumetopoea processionea) is a moth whose caterpillars can be found in oak forests ...
Oak Park Conservatory
... Oak Park Conservatory is a conservatory and botanical garden located at 615 Garfield Street in the Chicago suburb of Oak Park, Illinois, United States ... The Oak Park Conservatory was added to the U.S ...
University Of Rochester Arboretum
... is located beside the Genesee River on a site previously owned by the Oak Hill Country Club ... had designed a "River Walk" of oak trees along the river and after the university purchased the site in 1923, his son Frederick Law Olmsted, Jr ... Elmwood Avenue and Intercampus Drive are 197 oak trees representing 15 species ...
Wye Oak
... The Wye Oak was the honorary state tree of Maryland, and the largest white oak tree in the United States ... Mills, Talbot County, Maryland, the Wye Oak was believed to be over 460 years old at the time of its destruction during a severe thunderstorm on June 6, 2002, and measured 31 feet 10 inches (970 cm) in ... It is believed that the acorn that became the oak germinated around the year 1540 ...

Famous quotes containing the word oak:

    When the red-cheeked, dancing girls, April and May, trip home to the wintry, misanthropic woods; even the barest, ruggedest, most thunder-cloven old oak will at least send forth some few green sprouts, to welcome such glad-hearted visitants.
    Herman Melville (1819–1891)

    Alas for America as I must so often say, the ungirt, the diffuse, the profuse, procumbent, one wide ground juniper, out of which no cedar, no oak will rear up a mast to the clouds! It all runs to leaves, to suckers, to tendrils, to miscellany. The air is loaded with poppy, with imbecility, with dispersion, & sloth.
    Ralph Waldo Emerson (1803–1882)

    Yet poetry, though the last and finest result, is a natural fruit. As naturally as the oak bears an acorn, and the vine a gourd, man bears a poem, either spoken or done. It is the chief and most memorable success, for history is but a prose narrative of poetic deeds.
    Henry David Thoreau (1817–1862)