About River Birch at OSU's Landscape Plants site
Native to the eastern half of the U.S.
Can attain over 100’ in height.
Leaves are large for a birch, shiny on top and coarsely scalloped on edges.
Flowers are male and female catkins on same limb.
Bark on mature tree is unbirchlike, black and longitudinally fissured. Upper branches look birchlike.
Very rare in Portland.