Populus heterophylla
Encyclopedia
Populus heterophylla, known as the Swamp Cottonwood, also called the River Cottonwood, Downy Poplar, Swamp Poplar, or Black Cottonwood which is actually Populus trichocarpa
Populus trichocarpa
Populus trichocarpa is a deciduous broadleaf tree species native to western North America. It is used for timber, and is notable as a model organism in plant biology. Its full genome sequence was published in 2006...

, is a large deciduous Poplar
Poplar
Populus is a genus of 25–35 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 , aspen, and cottonwood....

 belonging to section Leucoides of the larger Salindaceae family, found in wet bottom land forests. Reaching a height of 100 feet (30.5 m) at full maturity and 50 feet (15.2 m) in 20 years. The swamp cottonwood similar to the Eastern Cottonwood
Eastern Cottonwood
Populus deltoides, the eastern cottonwood, is a cottonwood poplar native to North America, growing throughout the eastern, central, and southwestern United States, the southernmost part of eastern Canada, and northeastern Mexico.-Description:...

 except the leaves are cordate (heart-shaped) instead of deltoid

This species is indigenous to warm, temperate regions in North America
North America
North America is a continent wholly within the Northern Hemisphere and almost wholly within the Western Hemisphere. It is also considered a northern subcontinent of the Americas...

, although nowhere is it considered abundant. Swamp Cottonwood can be found along the eastern seaboard of the United States from Connecticut and southeastern New York to Georgia and northwestern Florida, west to Louisiana. It also grows north in the Mississippi Valley to southeastern Missouri, western Tennessee, Kentucky, southern Illinois, Indiana, Ohio, and southern Michigan. Recently, a separated population was discovered on a flat clay plain near Lake St. Clair in extreme south western Ontario, Canada in 2007.

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