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''Acer laevigatum'' (smooth maple or Nepal maple), is an atypical species of maple native to southern China (Guizhou, Hong Kong, Hubei, Shanxi, Sichuan, Xizang, Yunnan), northern India (Arunachal Pradesh, Sikkim), northern Myanmar, Nepal, and northern Vietnam. It grows at moderate altitudes of 1,000-2,000 m, with a wet monsoon climate.〔Xu, T.-z., Chen, Y., de Jong, P. C., & Oterdoom, H. J. (''Flora of China'': Aceraceae (draft) )〕〔van Gelderen, C.J. & van Gelderen, D.M. (1999). ''Maples for Gardens: A Color Encyclopedia''.〕 Acer laevigatum is an evergreen tree growing to a height of 10–15 m or more, with a trunk up to 50 cm diameter. The leaves are smooth, unlobed, leathery, olive-green, and about 6–15 cm long and 3–5 cm wide, with a short 1-1.5 cm petiole. The leaves are normally persistent, and only drop in winter in unusually severe frost.〔 The samaras are 4–7 cm long and have a purplish tone. There are two varieties, which may not be fully distinct:〔 *''Acer laevigatum'' var. ''laevigatum'' Most of the species' range. Leaves glabrous (hairless). *''Acer laevigatum'' var. ''salweenense'' (W.W.Smith) J.M.Cowan ex W.P.Fang - Yunnan. Leaves pubescent (downy). ==Cultivation== This tree is only rarely seen in maple collections as it is too tender for many locations, with successful cultivation north to Ireland in Europe, and southwest British Columbia in North America.〔〔Bean, W. J. (1970). ''Trees and Shrubs Hardy in the British Isles'', 8th ed.〕〔Rushforth, K. D. (1999). ''Trees of Britain and Europe''. ISBN 0-00-220013-9.〕 One in Cornwall is 17 m tall (Tree Register of the British Isles). 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「Acer laevigatum」の詳細全文を読む スポンサード リンク
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