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Populus × canescens
''Populus'' × ''canescens'', the grey poplar, is a hybrid between ''Populus alba'' (white poplar) and ''Populus tremula'' (common aspen). It is intermediate between its parents, with a thin grey downy coating on the leaves, which are also much less deeply lobed than the leaves of ''P. albus''. It is a very vigorous tree with marked hybrid vigour, reaching 40 m tall and with a trunk diameter over 1.5 m – much larger than either of its parents. Most trees in cultivation are male, but female trees occur naturally and some of these are also propagated.〔
==Taxonomy==
In 1789 William Aiton described the grey poplar as a variety of ''Populus alba'', ''P. alba'' var. ''canescens''.〔 In 1804, James Edward Smith raised it to a full species, ''Populus canescens''.〔 He described differences between the leaves of the two taxa: ''P. alba'' has lobed leaves with snow-white ("''niveus''") undersides, whereas ''P. canescens'' has wavy-edged leaves with hoary ("''incanus''") undersides.〔 Later authors sometimes noted the possibility that the grey poplar was a hybrid.〔 It is now considered to be a hybrid between ''Populus alba'' and ''Populus tremula'',〔 so the scientific name is written with the hybrid symbol.
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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