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''Quercus georgiana'', the Georgia oak or Stone Mountain oak, is a rare deciduous oak. It is native to the southeastern United States, mainly in northern Georgia, but with additional populations in Alabama, North Carolina, and South Carolina.〔(Biota of North America Program 2014 county distribution map )〕 It grows on dry granite and sandstone outcrops of slopes of hills at 50–500 meters (167-1667 feet) altitude.〔 Listed as Endangered (EN B1+2ce v2.3)〕〔 ''Quercus georgiana'' is a small tree, often shrubby, growing to 8–15 meters (25–50 feet) tall. The shiny green leaves are 4–13 cm (2-5 inches) long and 2–9 cm wide, with a 0.6-2.3 cm petiole, and five irregular, pointed, bristle-tipped lobes; they are glabrous (hairless), except for small but conspicuous tufts of hairs in the vein axils on the underside. The leaves turn dark red to brown in the autumn, stay on the tree throughout the winter, and fall as the new leaves bud in the spring. The acorns are round, 9–14 mm long, maturing about 18 months after pollination.〔(Flora of North America - ''Quercus georgiana'' )〕 The Georgia oak is classified in the red oak section ''Quercus'' sect. ''Lobatae''. The tree was first discovered in 1849 at Stone Mountain, Georgia, where several specimens grow along the popular walk-up trail. In the wild they are often shrub-like. It is occasionally cultivated as a specimen or garden tree in USDA plant hardiness zones 5-8. Besides landscape horticulture, the Georgia oak has no commercial uses. ==References== 抄文引用元・出典: フリー百科事典『 ウィキペディア(Wikipedia)』 ■ウィキペディアで「Quercus georgiana」の詳細全文を読む スポンサード リンク
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