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Ulmus 'Coolshade' : ウィキペディア英語版 | Ulmus 'Coolshade'
''Ulmus'' 'Coolshade' is an American hybrid cultivar cloned from a crossing of the Slippery, or Red, Elm ''Ulmus rubra'' (female parent) and the Siberian Elm ''Ulmus pumila'' at the Sarcoxie Nurseries, Sarcoxie, Missouri, in 1946. ==Description==
'Coolshade' has rapid, stocky growth with a compact crown resistant to breakage under ice and snow; its foliage a very dark green.〔Green, P. S. (1964). Registration of cultivar names in Ulmus. ''Arnoldia'', Vol. 24. Arnold Arboretum, Harvard University. ()〕〔Bean, W. J. (1981). ''Trees and shrubs hardy in Great Britain'', 7th edition. Murray, London.〕
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