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''Ulmus'' 'Morton' (selling name ™) is an elm cultivar cloned from a putative intraspecific hybrid planted at the Morton Arboretum in 1924, which itself originated as seed collected from a tree at the Arnold Arboretum in Massachusetts. Although this tree was originally identified as ''Ulmus crassifolia'', it is now is believed to have been a hybrid of the Japanese Elm ''Ulmus davidiana'' var. ''japonica'' and Wilson's Elm, the latter now sunk as ''Ulmus davidiana'' var. ''japonica''.〔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.()〕 ==Description== The parent tree at the Morton Arboretum is noted for the resemblance of its habit to the American Elm ''Ulmus americana'', its upright-arching branches creating the familiar vase-shape, although the tree does not grow as large as the iconic native elm, reaching scarcely 20 m at maturity (). Its glossy, deep green leaves are also markedly smaller, rarely exceeding 8 cm in length. The tree is commercially propagated by grafting onto an ''Ulmus pumila'' rootstock. has a propensity to produce co-dominant stems and major branches with bark inclusions, demanding corrective pruning on at least an annual basis where planted in towns.〔Iles, J. (2009). Forget your fear of the elms. ''Western University'' website〕 Image:Accolade foliage.JPG| foliage, midsummer Image:Princeton and Accolade leaves.JPG|American Elm (left) and leaf comparison 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 'Morton' Accolade」の詳細全文を読む スポンサード リンク
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