Fremont cottonwood (Fremont cottonwood) belongs to the Salicaceae (the Willow family). It is a tall deciduous tree that is distributed to southwestern Unite States, from Colorado-California to northern Mexico. This tree grows in damp areas along the rivers of forests, grasslands and deserts, and can reach 12-24 m in height. The bark is gray, thich and deep furrowed. The leaves are deltoid with acute tips. It is dioecious. The drooping catkins are borne and bloom many flowers in early spring. The fruits are ovate, ripen in spring, splitting open and scatter many cottony seeds.