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Ulmus 'Nana'
The elm cultivar 'Nana' is a very slow growing shrub that with time forms a small tree. It was believed for many years to be a form of ''Ulmus glabra'' and is known widely as the 'Dwarf Wych Elm'. However, the ancestry of 'Nana' has been disputed in more recent years, Melville considering the specimen once grown at Kew to have been a cultivar of ''Ulmus × hollandica''.〔Melville, R. (1978). On the discrimination of species in hybrid swarms with special reference to ''Ulmus'' and the nomenclature of ''U. minor'' (Mill.) and ''U. carpinifolia'' (Gled.). ''Taxon'' 27: 345-351.〕
==Description==
The tree rarely exceeds 5 m in height, but is often broader.〔Bean, W. J. (1981). ''Trees and shrubs hardy in Great Britain'', 7th edition. Murray, London.〕〔White, J. & More, D. (2003) ''Trees of Britain & Northern Europe''. Cassell's, London.〕 The dark green leaves are smaller than the type, < 11 cm long by 8 cm broad. Green〔Green, P. S. (1964). Registration of cultivar names in Ulmus. ''Arnoldia'', Vol. 24. Arnold Arboretum, Harvard University. ()〕 describes it as a very distinct variety not growing above 2 feet (60 cm) in 10 to 12 years. A specimen at Kew was described by Henry as 'a slow-growing hemispherical bush that has not increased appreciably in size for many years'.〔Elwes, H. J. & Henry, A. (1913). ''The Trees of Great Britain & Ireland''. Vol. VII. pp 1848-1929. Private publication ()〕
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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