I don't know but the leaves look birchy. Or perhaps aspeny.

looks like bigtooth aspen

Yes( floraluk2 ), the leaves look "Birchy" to me too. But the bark is all wrong.

In act, now that you clued me in, searching the Mn wildflowers site brought me to:

Big-tooth Aspen

Populus grandidentata https://www.minnesotawildflowers.info/tree/big-tooth-aspen

Arbordave - you beat me by 1 minute!

Bark is not Birchy one. And yes, it is bigtooth aspen.

Agree, bigtooth aspen. They sometimes produce "colonies" with their root-sprouts if open-grown. When living in wooded VA, there were occasional bigtooth aspens in the oak/hickory forest right up there with them in the 80 to 90 ft canopy, standing out by their smooth, cream-greenish upper bark.