fubar2, Here in the west when someone refers to a Cottonwood they are generally referring to a Populas deltoides or P. trichocarpa The Quaking aspen is in the same genus but different species, Populas tremuloides.
Cottonwoods live around 100 or so years and can get over 100 ft tall. In fact the P. trichocarpa is the tallest native western hardwood. We have Cottonwoods here with 6 - 8' dbh.
The Quaking aspen is a short-lived tree (individually although the groves live a long time) that is typically around 25 - 35' ht max with 1 - 1 1/2' dbh. The leaves on an aspen are set perpendicular to their flattened petiole which gives them the "quaking" appearance in the wind. We don't find as many uses for the aspen wood as the cottonwood.
D and S Mc
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