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Quercus acutissima
''Quercus acutissima'', the sawtooth oak, is an Asian species of oak native to China (including Tibet), Korea, Japan, Indochina (Vietnam, Thailand, Myanmar, Cambodia) and the Himalayas (Nepal, Bhutan, northeastern India).〔(Flora of China, ''Quercus acutissima'' Carruthers, 1862. 麻栎 ma li )〕 It is widely planted in many lands and has become naturalized in parts of North America.〔
''Quercus acutissima'' is closely related to the turkey oak, classified with it in ''Quercus'' sect. ''Cerris'', a section of the genus characterised by shoot buds surrounded by soft bristles, bristle-tipped leaf lobes, and acorns that mature in about 18 months.〔
==Description==
''Quercus acutissima'' is a medium-sized deciduous tree growing to 25–30 m tall with a trunk up to 1.5 m in diameter. The bark is dark gray and deeply furrowed. The leaves are 8–20 cm long and 3–6 cm wide, with 14-20 small saw-tooth like triangular lobes on each side, with the teeth of very regular shape.〔
The flowers are wind-pollinated catkins. The fruit is an acorn, maturing about 18 months after pollination, 2–3 cm long and 2 cm broad, bicoloured with an orange basal half grading to a green-brown tip; the acorn cup is 1.5–2 cm deep, densely covered in soft 4–8 mm long 'mossy' bristles. It is closely related to ''Quercus cerris'', classified with it in ''Quercus'' sect. ''Cerris'', a section of the genus characterised by shoot buds surrounded by soft bristles, bristle-tipped leaf lobes, and acorns that mature in about 18 months.〔
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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