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Ulmus × viminalis
''Ulmus'' × ''viminalis'' Lodd., occasionally referred to as the Twiggy Field Elm, is an elm hybrid derived from the crossing of ''U. minor'' and ''U. minor'' 'Plotii'. Bean said that the cultivar, which he called ''Ulmus'' 'Viminalis', is one form of a natural hybrid, ''U. × viminalis'', which occurs from Essex to Oxfordshire.〔Bean, W. J. (1988) ''Trees and shrubs hardy in Great Britain'', 8th edition, Murray, London, p.659〕 According to Henry, this was the tree first described in 1677 by Robert Plot from specimens growing in an avenue and coppice at Hanwell near Banbury,〔Elwes, H. J. & Henry, A. (1913). ''The Trees of Great Britain & Ireland''. Vol. VII. p.1906. Private publication. ()〕 though the name 'Plot's Elm' was later given by George Claridge Druce not to this hybrid but to one of its parents.〔Wilkinson, Gerald, ''Epitaph for the Elm'', London 1978, p.72〕 However, writing in 1940 and referring to a pencil rubbing in ''Herb. Druce'', vol. 113 of the Sloane Collection, Melville questioned Henry's claim. "I can see no reason to doubt that this is Plot's plant", but "it is () ''U.'' × ''viminalis'' Lodd".〔Melville, Ronald, ''The Journal of Botany'', London, Vol.78, Aug. 1940〕
The tree was once commonly treated as a variety of English Elm before it was determined as a hybrid by Melville.〔Green, P. S. (1964). Registration of cultivar names in Ulmus. ''Arnoldia'', Vol. 24. Arnold Arboretum, Harvard University. ()〕
==Description==
Bean's description, "a narrow-headed, rather slender tree", and Henry's "tree with ascending branches, pendulous branchlets, and sparse foliage", accord with what would be expected from a crossing of Plot Elm and Smooth-leaved Elm. ''Ulmus'' × ''viminalis'' is a slow-growing tree which can ultimately reach 20 m in height.〔Elwes, H. J. & Henry, A. (1913). ''The Trees of Great Britain & Ireland''. Vol. VII. p.1906. Private publication.〕〔Browne, D. J. (1846). ''The Trees of America''. Harper & Brothers, New York.〕 Leaves vary according to ''U. minor'' parentage, from obovate-elliptic to narrowly elliptic; they are deeply serrated, < 5.0 cm long, nearly symmetrical at the base and long-acuminate at the tip, with prominent white axil tufts on the undersides.〔〔 The cultivar form can be mistaken for a variety of birch;〔 the tree has also been likened to ''Zelkova × verschaffeltii''.〔
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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