Chinese dwarf birch is a shrub or small tree native to mountain ridges and rocky slopes in China and Korea. It has dark bark, small leaves with toothed edges, and short, rounded fruit clusters.
Look for the shorter, nearly round fruit clusters of Chinese dwarf birch. Its smaller, more diamond-shaped leaves also help; close photos are useful.
Why they get mixed upBoth are dark-barked birches with toothed leaves.