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The ''Ulmus pumila'' cultivar 'Aurescens' was introduced by Georg Dieck at the National Arboretum, Zöschen, Germany circa 1885. Dieck grew the tree from seed collected in the Ili valley, Turkestan (then a region of Russia, now part of Kazakhstan) by the lawyer and amateur naturalist Vladislav E. Niedzwiecki while in exile there.〔Dieck, G. (1894). ''Neuheiten-Offerten des National-Arboretums zu Zöschen bei Merseburg, 1894/95.''〕〔Hansen, N. How to produce that $1000 premium apple, in Minnesota State Hort. Soc. (1900). ''Trees, fruits & flowers of Minnesota''. Vol. 28. 470-1. Forgotten Books, London, 2013. ISBN 9781153197953〕 Dieck originally named the tree ''U. pinnato-ramosa'' f. ''aurescens''. 〔Green, P. S. (1964). Registration of cultivar names in Ulmus. ''Arnoldia'', Vol. 24. Arnold Arboretum, Harvard University. ()〕 ==Description== 'Aurescens' is distinguished by its golden leaves on emergent shoots in spring; the foliage reverts to dark green by summer. 〔 The tree is otherwise identical to 'Turkestan'. Ulmus pumila 'Aurescens' leaf, September.jpg|Leaf, in September U. pumila 'Aurescens', April 2015.jpg|Bute Park tree in spring U. pumila 'Aurescens'.JPG|Bute Park tree in winter 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 'Aurescens'」の詳細全文を読む スポンサード リンク
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