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Ulmus 'Willis'
''Ulmus'' 'Willis' is a hybrid cultivar which originated as a crossing made by a Mr Minnick of Kansas and treated simply as a hybrid. Almost certainly derived from a crossing of the Siberian Elm ''Ulmus pumila'' (female parent) and the Red Elm ''Ulmus rubra'', it was originally believed that the American parent was the American Elm ''Ulmus americana'', not the Red Elm.
==Description==
'Willis' was described as having a smooth grey bark, large leaves similar to ''U. americana'', and capable of very rapid growth.〔Green, P. S. (1964). Registration of cultivar names in Ulmus. ''Arnoldia'', Vol. 24. Arnold Arboretum, Harvard University. ()〕
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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