Black cottonwood leaves may also have an ovate shape ... turning golden yellow in the fall. The Fremont cottonwood's fruit differs from other subspecies in that it is light brown and egg-shaped.

DENVER — The leaves don’t turn color in the fall -- their true colors just get ... enough to support that type of genetic development. Cottonwood leaves for example are almost exclusively ...

Another key factor for fall colors ... those narrow-leaf cottonwoods,” West said. “Narrow-leaf cottonwoods throughout a good portion of the state have been dealing with the cottonwood leaf ...