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Quercus tomentella
''Quercus tomentella'', the island oak,〔(''Quercus tomentella''. ) The Jepson Manual.〕 island live oak,〔(''Quercus tomentella''. ) USDA PLANTS.〕 or Channel Island oak,〔(''Quercus tomentella''. ) Flora of North America.〕 is an oak in the section ''Protobalanus''. It is native to six islands off the coast of California and to one Mexican island: five of the Channel Islands of California plus Guadalupe Island (part of the State of Baja California).〔(''Quercus tomentella''. ) California Native Plant Society. Inventory of Rare and Endangered Plants. 2013.〕
==Description==
Island oak is a tree growing up to in height.〔 The mature tree has a grayish to reddish brown trunk with scaly, furrowed bark.〔 The twigs are reddish and covered in woolly hairs. The leathery leaf blades are often concave and are an oblong lance shape or oval with pointed or rounded tips. The edges are smooth or toothed.〔 The upper surfaces are dark green and lightly hairy when new, losing the hairs over time. The undersides are gray-green and coated in woolly hairs, becoming less woolly with age.〔 They are usually 7 to 10 centimeters (2.8-4.0 inches) long, sometimes up to 12 cm (4.8 inches). The acorn grows singly or in pairs. The cup has thick scales and woolly hairs and is up to 3 centimeters (1.2 inches) wide. The nut is up to 3.5 centimeters (1.4 inches) with a rounded tip.〔〔
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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