Quaking asp, is here but a small tree of the second or third class, seldom more than twenty to forty feet high, particularly toward the north, where it becomes a mere shrub. A form of this species in the parks of the Rocky Mountains springs up spontaneously in the greatest abundance wherever the woodlands have been burned over. The older trees had handsome shafts fifty to sixty feet high, and are used in construction. This is almost unique as a deciduous tree among the conifers of that region.

Generally speaking, this species has little value, but there are some peculiar forms which are cultivated and placed for effect in gardens and parks.