|
''Ulmus pumila'' L., the Siberian elm, is native to Central Asia, eastern Siberia, Mongolia, Xizang (Tibet), northern China, India (northern Kashmir) and Korea.〔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. ()〕 It is also known as the Asiatic elm and dwarf elm. It is the last tree species encountered in the semi-desert regions of central Asia.〔onlinelibrary.wiley.com/doi/10.1111/j.1469-8137.2005.01384.x/pdf〕 Introduced to the USA in 1905 by Prof. J. G. Jack,〔Leopold, D. J. (1980). Chinese and Siberian elms. ''Journal of Arboriculture''. 6 (7): July 1980, 175–179〕''Ulmus pumila'' has been widely cultivated throughout the Americas, Asia and, to a lesser extent, southern Europe. ==Description== The Siberian elm is usually a small to medium-sized, often bushy, tree growing to tall, with a trunk up to d.b.h. () The leaves are deciduous in cold areas, but semi-evergreen in warmer climates, < 7 cm long and < 3 cm broad, with an oblique base and a coarsely serrated margin, changing from dark green to yellow in autumn. The perfect, apetalous wind-pollinated flowers emerge in early spring, before the leaves; unlike most elms, ''U. pumila'' is able to self-pollinate successfully. The wind-dispersed fruit develops in a flat, oval membranous wing (samara) long and notched at the outer end.〔Elwes, H. J. & Henry, A. (1913). ''(The Trees of Great Britain & Ireland )''. Vol. VII. 1848–1929. Republished 2004 Cambridge University Press, ISBN 9781108069380〕 The tree is short-lived in temperate climates, rarely reaching more than 60 years of age, but in its native environment may live to between 100 and 150 years () (). Image:Ulmus pumila leaves.jpg|Summer foliage Image:Elm in beijing.JPG|Fruits (and larva of ''Satyrium w-album'') Image:Ulmus pumila.jpg|Cultivated specimen of ''Ulmus pumila'', Morton Arboretum Image:비술나무 잎가지.JPG|Typical 'long shoots' of pendulous forms of ''Ulmus pumila'' Image:RN Ulmus pumila.JPG|'Poort Bulten', a compact, small-leaved form of ''Ulmus pumila'' Image:2014-10-11 14 51 33 Siberian Elm foliage during autumn in Elko, Nevada.JPG|Autumn foliage 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「Ulmus pumila」の詳細全文を読む スポンサード リンク
|
