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Ulmus davidiana
''Ulmus davidiana'' Planch., the David elm, is a small deciduous tree widely distributed across China, Mongolia, Korea, Siberia, and Japan, where it is found in wetlands along streams at elevations of 2000 m to 2300 m (6,500 to 7,500 ft).〔Fu, L., Xin, Y. & Whittemore, A. (2002). Ulmaceae, in Wu, Z. & Raven, P. (eds) ''Flora of China'', Vol. 5 (Ulmaceae through Basellaceae). Science Press, Beijing, and Missouri Botanical Garden Press, St. Louis, USA. ()〕 The tree was first described in 1873 from the hills north of Beijing, China.〔Heybroek, H. M. (1981). The Japanese elm species and their value for the Dutch elm breeding program. ''Proceedings of the Dutch Elm Disease symposium and workshop''. October 5–9, 1981, Winnipeg, Manitoba. pp 78-90〕
==Classification==
Two varieties of ''Ulmus davidiana'' are recognized: var. ''davidiana'' L.K.Fu, occurring only in China, and var. ''japonica'' Rehder, the more widely ranging Japanese Elm.
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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