Wiktionary
river birch
n. ''Betula nigra''
WordNet
river birch
n. birch of swamps and river bottoms throughout the eastern United States having reddish-brown bark [syn: black birch, red birch, Betula nigra]
Usage examples of "river birch".
We had been days on the water and had paid little mind to the forest we were passing through, but this was big timber, giant sycamores, blue beech, river birch, and clumps of black willow, with here and there a table of rhododendrons.
Grass is even better than pine needles, and tomorrow I am going to try the outside bark of the river birch.
Above their heads stands of larch, oak and river birch intermingled with cedars and white pines.