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Quercus nigra, the water oak, is an oak in the red oak group (Quercus sect. Lobatae), native to the eastern and south-central United States, found in all the coastal states from New Jersey to Texas, and inland as far as Oklahoma, Kentucky, and southern Missouri.[3] It occurs in lowlands and up to 450 meters (1,480 feet) in elevation.

Water oak
Leaves and acorns
Conservation status
Least Concern  (IUCN 3.1)[1]
Scientific classification
Kingdom:	Plantae
Clade:	Tracheophytes
Clade:	Angiosperms
Clade:	Eudicots
Clade:	Rosids
Order:	Fagales
Family:	Fagaceae
Genus:	Quercus
Subgenus:	Quercus subg. Quercus
Section:	Quercus sect. Lobatae
Species:	Q. nigra
Binomial name
Quercus nigra L.
Natural range
Synonyms[2]
List Quercus agnostifolia K.Koch Quercus aquatica (Lam.) Walter Quercus bumelifolia Riddell Quercus dentata Bartram Quercus genabii K.Koch Quercus marylandica Du Roi Quercus microcarya Small Quercus nana Willd. Quercus noviorleani Petz. & G.Kirchn. Quercus quinqueloba Engelm. Quercus uliginosa Wangenh.

Other names include spotted oak, duck oak, punk oak, orange oak, and possum oak.

Description

Quercus nigra is a medium-sized deciduous tree, growing to 30 meters (98 feet) tall with a trunk up to 1 m (3 ft 3 in) in diameter. Young trees have a smooth, brown bark that becomes gray-black with rough scaly ridges as the tree matures. The leaves are alternate, simple and tardily deciduous, remaining on the tree until mid-winter; they are 3–12 centimeters (1+1⁄4–4+3⁄4 inches) long and 2–6 cm (3⁄4–2+1⁄4 in) broad, variable in shape, most commonly shaped like a spatula being broad and rounded at the top and narrow and wedged at the base. The margins vary, usually being smooth to shallowly lobed, with a bristle at the apex and lobe tips. The tree is easy to identify by the leaves, which have a lobe that looks as if a drop of water is hanging from the end of the leaf. The top of each leaf is a dull green to bluish green and the bottom is a paler bluish-green. On the bottom portion of the leaves, rusty colored hairs run along the veins. The acorns are arranged singly or in pairs, 10–14 millimeters (3⁄8–1⁄2 in) long and broad, with a shallow cupule; they mature about 18 months after pollination in autumn of the second year.[4]

Ecology

Water oak serves the same ecological role as weeping willow and other wetland trees. It is adapted to wet, swampy areas, such as along ponds and stream banks, but can also tolerate well-drained sites and even heavy, compacted soils. It grows in sandy soils, red clays, and old fields to the borders of swamps, streams, to bottomlands. Due to its ability to grow and reproduce quickly, the water oak is often the most abundant species in a stand of trees. The tree is relatively short-lived compared to other oaks and may live only 60 to 80 years. It does not compete well and does not tolerate even light shade. Water oak is frequently used to restore bottomland hardwood forests on land that was previously cleared for agriculture or pine plantations. Minimum age for flowering and fruiting is 20 years and the tree produces heavy crops of acorns nearly every year. Water oak is not recommended as an ornamental due to being short-lived, disease-prone, and extremely messy.

Hybrids of water oak are known with southern red oak (Quercus falcata), bluejack oak (Quercus incana), turkey oak (Quercus laevis), blackjack oak (Quercus marilandica), willow oak (Quercus phellos), Shumard oak (Quercus shumardii), and black oak (Quercus velutina).

Water oak acorns are an important food for white-tailed deer, eastern gray squirrel, raccoon, wild turkey, mallard, wood duck, and bobwhite quail. In winter, deer will browse the buds and young twigs.

Uses

Water oak has been used for timber and for fuel by people in the southern states since the 17th century. The wood is generally sold as "red oak", mixed with the wood from other red oaks.

References

External links

• C. Michael Hogan (ed.)(2011). "Quercus nigra". Encyclopedia of Life. Contributor Missouri Botanical Gardens
• United States Department of Agriculture, National Forest Service
• "Quercus nigra". Germplasm Resources Information Network (GRIN). Agricultural Research Service (ARS), United States Department of Agriculture (USDA).
• photo of herbarium specimen at Missouri Botanical Garden, collected in Missouri in 1948

На других языках

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[de] Wasser-Eiche

Die Wasser-Eiche (Quercus nigra) ist eine Pflanzenart aus der Gattung der Eichen (Quercus) innerhalb der Familie der Buchengewächse (Fagaceae). Das natürliche Verbreitungsgebiet liegt in den östlichen bis zentralen USA. Ihre englische Trivialnamen sind water oak oder possum oak.[1][2]

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- [en] Quercus nigra

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[es] Quercus nigra

Quercus nigra, es un roble del grupo (Quercus sect. Lobatae), nativa del sudeste de Estados Unidos, desde el sur de Delaware y el sur a las zonas costeras de Maryland, Virginia , el pie de monte de Carolina del Norte , toda Carolina del Sur, la mayor parte de Georgia (con la excepción de los Montes Apalaches ), toda Alabama, Misisipi, en el centro de la Florida, y hacia el oeste de Luisiana y el este de Texas. Desde allí, hacia el norte hasta el sureste de Misuri incluyendo Arkansas, el este de Oklahoma , partes de Tennessee, y el extremo suroeste de Kentucky. Se produce en las tierras bajas y de hasta 450 m de altitud.

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[ru] Дуб чёрный

Дуб чёрный[2] (лат. Quercus nigra) — вид рода Дуб (Quercus) семейства Буковые (Fagaceae). Этот вид относится к красным дубам.

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