This is the form which the Elm seems most prone to assume when it stands
from the time it was a seedling until it attains its full stature in an
open space. It then shows a broad hemispherical head, formed by branches
of nearly equal size, issuing chiefly from a common centre, diverging
first at a small angle, and gradually spreading outward with a curve
that may be traced throughout their length. A considerable number of our
roadside elms are specimens more or less imperfect of this normal type.