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''Ulmus'' 'Morfeo' is a hybrid elm cultivar raised by the Istituto per la Protezione delle Piante (IPP), Florence, in 2000.〔Mittempergher, L, & Porta, N. la, (1991). Hybridization studies in the Eurasian species of elm (Ulmus spp.). ''Silvae Genetica'' 40, 237-243.〕 Originally identified as 'FL 509', 'Morfeo' arose from a crossing of the Chenmou Elm (male parent), a small tree from the provinces of Anhui and Jiangsu in eastern China,〔Fu, L. & Jin J. (eds). (1992). ''China Red Data Book. Rare and endangered plants. Vol. 1''. Science Press, Beijing.〕〔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. ()〕 and the Dutch hybrid clone '405'.〔Santini, A., Pecori, F., Pepori, A., & Brookes, A. (2011). 'Morfeo' Elm: a new variety resistant to Dutch elm disease. ''Forest Pathology'', April 2012, Vol. 42, Issue 2, 171-176 ()〕 The '405' clone is a full sister of 'Groeneveld', a crossing of an English ''U.'' × ''hollandica'' and a French ''U. minor'' from the Barbier Nursery, Orléans.〔Heybroek, H. M. (1993). The Dutch Elm Breeding Program. In Sticklen & Sherald (Eds.) (1993). ''Dutch Elm Disease Research'', Chapter 3. Springer Verlag, New York, USA〕 'Morfeo' was patented and released to commerce in 2011.〔 ==Description== 'Morfeo' is a robust, fast-growing tree able to freestand at a very early age.〔Santini, A., Pecori, F., Pepori, A. L., Ferrini, F., Ghelardini, L. Genotype × environment interaction and growth stability of several elm clones resistant to Dutch elm disease. ''Forest Ecology and Management''. Elsevier B. V., Netherlands.〕 The stem commences forking at between 1.5 and 2 m from the ground, the branches on juvenile trees with irregular patches of corky bark. The reddish branchlets bear mid - green elliptic leaves, < 120 mm (avg. 88 mm) long × < 80 mm (avg. 56 mm) broad with 10 mm petioles. The leaves closely resemble those of the Field Elm, with typically asymmetric base and acuminate apex; they turn crimson in late October, before falling in early November. In the UK the tree begins flowering in its fourth year, the perfect, apetalous wind-pollinated flowers appearing in mid March. The sessile samarae ripen in mid May, and are narrowly obovate, 17 – 22 mm long × 9 – 13 mm broad with the seed offset next to the notched apex.〔 The tree will usually begin to sucker from roots when aged about 5 years. Image:Morfeo leaf.jpg|'Morfeo' leaf and Euro coin. Image:Morfeo autumn colour 2.jpg|'Morfeo' leaf colour, late October. Image:Morfeo, corky ridged bark.jpg|'Morfeo' corky bark on juvenile branch. 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 'Morfeo'」の詳細全文を読む スポンサード リンク
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