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Quercus nigra
''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.〔(Biota of North America Program 2014 county distribution map )〕 It occurs in lowlands and up to 450 m (1500 ft) altitude.
==Description==
''Quercus nigra'' is a medium-sized deciduous tree, growing to 30 m (100 ft) tall with a trunk up to 1 m (3 ft) 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 cm (1–5 in) long and 2–6 cm (1/2–2 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 mm (1/3-1/2 in) long and broad, with a shallow cupule; they mature about 18 months after pollination in fall of second year.〔(Flora of North America: ''Quercus nigra'' )〕
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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