American Mountain-Ash, Rowan

American mountain-ash is a native, smooth-barked, deciduous shrub or
small tree 10 to 30 feet (3-9 m) tall, with an average d.b.h. of 4 to 10
inches (10-25 cm). It has a short trunk; slender, spreading branches;
and a narrow, open round-topped crown. In closed canopies it tends to
have a longer trunk, with the lower portions branch-free. It
tends to be slow growing and short-lived. The roots are fibrous.