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Populus is a genus of 25–30 species of deciduous flowering plants in the family Salicaceae, native to most of the Northern Hemisphere.English names variously applied to different species include poplar (/ ˈ p ɒ p l ər /), aspen, and cottonwood.
Populus × canescens, the grey poplar, is a hybrid between Populus alba (white poplar) and P. tremula (common aspen). 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 .
Poplar is the species on which transgenesis has been most extensively tested solely in the laboratory, despite a very complex and large genome, which has also been the most extensively studied among trees. GMO poplars (interspecific hybrid Populus tremula x P. alba, female clones of the subspecies Cultivar/INRA line #717-1B4) have been created ...
Populus × canadensis, known as Canadian poplar or Carolina poplar, is a naturally occurring hybrid of Populus nigra and Populus deltoides. [2] It is a vigorous, broadly columnar, deciduous tree growing to 40 m (130 ft), which is commonly used by landscape architects.
They often constitute early successional species of their landscapes. Roots are shallow and wide spreading; lateral root growth in a forest may be as far as 60 feet (18 m). [4] Generally, four to five lateral roots originate from the tree, and then branch within 2 feet (60 cm); vertical, penetrating roots near the base anchor the tree.
Populus × jackii (balm-of-Gilead, [1] bam bud, [2] bom-a-gilly [2]) is the hybrid between balsam poplar, Populus balsamifera, and the eastern cottonwood, Populus deltoides, occurring occasionally where the two parental species' ranges overlap.