Frémont's cottonwood

Populus fremontii

''Populus fremontii'', commonly known as Frémont's cottonwood, is a cottonwood native to riparian zones of the Southwestern United States and northern through central Mexico. It is one of three species in ''Populus'' sect.'' Aigeiros''. The tree was named after 19th century American explorer and pathfinder John C. Frémont.