A poplar is a type of tree in the genus Populus, which includes around 35 species. The most common species are the ABELE (Populus alba) and the COTTONWOOD (Populus deltoides). The ABELE is a medium-sized deciduous tree that grows up to 20 meters tall and has a white bark. The COTTONWOOD is a large deciduous tree that can reach heights of up to 40 meters and has a grayish-brown bark. Both trees are found in temperate regions of the Northern Hemisphere and are popular for their fast growth rate and attractive foliage.