Populus tremuloides Michx.

Aspen, a common clonal tree at high elevations, forming monoculture stands after large-scale disturbance.

A mature stand with young spruce that will eventually displace the Populus, Sangre de Cristo Mountains near Tesuque Peak, Santa Fe County, New Mexico, 16 Jun 2005..

Bark, La Sal Mountains, Utah, 18 Jun 2006.

Leaves, La Sal Mountains, 18 Jun 2006.

Bark, Thousandmile Canyon, west side of the Sacramento Mountains, Otero County, New Mexico, 19 May 2012.