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Ulmus 'Urban'
''Ulmus'' 'Urban' is an American hybrid elm cultivar selected from the progeny of a controlled crossing of the Siberian Elm ''Ulmus pumila'' (female parent) with the Dutch clone '148' (''U. × hollandica'' 'Vegeta' × ''U. minor'' '28') in 1958 by Toru Arisumi of the USDA at Columbus, Ohio. Clone '148' had been sent to the USA from the Netherlands in 1952 by Johanna Went, leader of the elm research team at the Willie Commelin Scholten Phytopathology Laboratory in Baarn. 〔 . Schippers, B & Roosje, G S (1997). Hundred years of history and the future of the Foundation ‘Willie Commelin Scholten Phytopathological Laboratory’. ''European Journal of Plant Pathology'', October 1997, Volume 103, Issue 7, 667-671〕
==Description==
'Urban' is considered a poor ornamental, the tree possessed of stiff branching and amorphous form.〔Photograph of 'Urban' elm, ().〕 The lanceolate to obovate leaves are < 9 cm long × < 4 cm broad, smooth with light venation on the upper surface, on 6 mm petioles and clustered on short, very thin, wingless branchlets.
Image: Urban foliage.JPG
Image: Urban bark.JPG
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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