Rio Grande Cottonwood - Populus deltoides ssp. wislizeni
A southwestern tree of moist habitats, this subspecies is common in the Rio Grande valley and the Colorado Plateau, growing in scattered populations. It may reach 60 feet in height, smaller than the eastern subspecies. The leaves are wider than long and are triangular with prominent teeth and translucent tips; they are borne on flat stems and thus tend to shake in a breeze. The leaf buds are sticky and pointed. Male and female catkins are produced on the same tree. This tree was historically was most common along rivers.