Populus ×canescens

Populus × canescens, the grey poplar, is a hybrid between Populus alba and P. tremula. It is intermediate between its parents, with a thin grey downy coating on the leaves, which are much less deeply lobed than the leaves of P. alba. It is a very vigorous tree with marked hybrid vigour, reaching 40 metres tall and with a trunk diameter over 1.5 m (5 ft) – 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.

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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, P. 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 P. alba and P. tremula, so the scientific name is written with the hybrid symbol.

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cbd_2014_pathway:escape_horticulture

established

Europe (WGSRPD:1)