populus dilatata

from The Collaborative International Dictionary of English v.0.48

Poplar \Pop"lar\, n. [OE. popler, OF. poplier, F. peuplier, fr.
   L. populus poplar.] (Bot.)
   1. Any tree of the genus {Populus}; also, the timber, which
      is soft, and capable of many uses.
      [1913 Webster]

   Note: The aspen poplar is {Populus tremula} and {Populus
         tremuloides}; Balsam poplar is {Populus balsamifera};
         Lombardy poplar ({Populus dilatata}) is a tall, spiry
         tree; white poplar is {Populus alba}.
         [1913 Webster]

   2. The timber of the tulip tree; -- called also {white
      poplar}. [U.S.]
      [1913 Webster]