Source : WordNet®

black birch
     n 1: common birch of the eastern United States having spicy brown
          bark yielding a volatile oil and hard dark wood used for
          furniture [syn: {sweet birch}, {cherry birch}, {Betula
          lenta}]
     2: birch of swamps and river bottoms throughout the eastern
        United States having reddish-brown bark [syn: {river birch},
         {red birch}, {Betula nigra}]