Populus nigra betulifolia is a species of deciduous broadleaf flowering plants (in the Salicaceae or Willow family), native to Britain and north-western Europe. It is the native subspecies of Populus nigra, which is found in much of western Eurasia. The columnar Lombardy Populus nigra cultivar is also present in Whiteknights Park. Populus nigra betulifolia prefers boggy ground in floodplains and wetlands, and supports a variety of wildlife. However, it has become very rare, with only a few thousand in the country; hybrids of Populus nigra with other Populus species are much more common.
Populus nigra betulifolia is an imposing tree, which can can grow up to around 30 metres tall, with a broad, spreading crown. Its bark is grey–brown and furrowed, typically with burrs (regions where the bark seems knotted or lumpy). The wood is soft, low-density, shock-resistant, and light brown to almost white in colour. Its leaves are green, triangular and tapered. As with all Populus species, male and female flowers are found on separate trees and appear as catkins in spring. Male catkins are red, female yellow–green and pollinated by the wind.
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