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Ulmus 'Koopmannii'
The elm cultivar ''Ulmus'' 'Koopmannii' was cloned from a specimen raised from seed sent from Margilan, Turkestan (now in eastern Uzbekistan) by Koopmann to the Botanischer Garten Berlin () c. 1880. The tree was first listed in the Späth nursery (Berlin, Germany), catalogue no. 62, p. 6. 101, 1885, as ''Ulmus Koopmannii'', and later by Krüssmann in ''Handb. Laubgeh.'' 2: 534, 1962, as a cultivar. Margilan is outside the main range of ''Ulmus minor''.〔(''Ulmus minor'' range map, linnaeus.nrm.se )〕 Augustine Henry, who saw the specimens in Berlin and Kew, believed Koopmann's Elm to be a form of ''Ulmus pumila'' (Siberian elm),〔Elwes, H. J., & Henry, A., The Trees of Great Britain & Ireland (Private publication, Edinburgh, 1913), Vol. VII, p.1927〕 and the tree is treated in some north Eurasian treatises as a cultivar of the Siberian Elm. Until DNA analysis can confirm its origin, the cultivar is now treated as ''Ulmus'' 'Koopmannii'.
==Description==
The tree is said to resemble ''Ulmus minor'' 'Umbraculifera' in form, though more globose in outline,〔'Elms grown in America', ''Arnoldia'', arnoldia.arboretum.harvard.edu, 7 December 1951, p.87 ()〕 with a dense, narrowish oval crown, a height to 10m,〔'Smaller Street-Trees Needed', Arnold Arboretum, arnoldia.arboretum.harvard.edu/.../1951-11--smaller-street-trees-needed〕 and small, ovate leaves < 30 mm in length.〔Ascherson & Graebner (1891). ''Syn. Middeleurop. Flora'', iv.557.〕〔Elwes, H. J. & Henry, A. (1913). ''The Trees of Great Britain & Ireland''. Vol. VII. pp 1848-1929. Private publication, Edinburgh. ()〕〔Lauche (1883). ''Deutsche Dendrologie'', 349.〕〔Photograph of young Koopmann's Elm at the Morton Arboretum (photo 2): cirrusimage.com ()〕
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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