WordNet (r) 3.0 (2006):

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, black
         birch, Betula lenta]
    2: birch of swamps and river bottoms throughout the eastern
       United States having reddish-brown bark [syn: black birch,
       river birch, red birch, Betula nigra]