This tree grows in my daughter's back yard here in Colorado. My first guess was a grafted tree. Then I saw others and I found out, do you know what kind it is?

Looks like the same cottonwoods we have in this area Ron. What do you think, cottonwood? Do you have a pic of the leaves?

It is actually an Aspen. Maybe a certain variety, don't know. After I saw this one I had no idea. Then when I was on a road trip, I saw an area full of them and was told they were Aspen.

aspen is correct, probably a silver or quaking variety.

are the leaves a dull silvery white on the underside?

Yep, dull silvery. Sure is an unusual bark in  how it abruptly ends a rough texture and goes smooth.

John Hechel said:

aspen is correct, probably a silver or quaking variety.

are the leaves a dull silvery white on the underside?

The rough bark is what fooled me, I thought that white stuff above was paint, some folks paint their trees so they don't wack em with there car at night. I thought the aspen had smooth silvery white bark the entire tree.

Ron Altier said:

Yep, dull silvery. Sure is an unusual bark in  how it abruptly ends a rough texture and goes smooth.

John Hechel said:

You will see patches of intermixed smooth and rough bark on the aspen trees around here.Ours are commonly called popple which is a local adaptation of the name poplar which I belive fall into the quaking aspen family.

Ron Altier said:

Yep, dull silvery. Sure is an unusual bark in  how it abruptly ends a rough texture and goes smooth.