populus tremuloides

from WordNet (r) 3.0 (2006)

Populus tremuloides
    n 1: slender aspen native to North America [syn: {American
         quaking aspen}, {American aspen}, {Populus tremuloides}]

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]

from The Collaborative International Dictionary of English v.0.48

Quaking \Quak"ing\,
   a. & n. from {Quake}, v.
   [1913 Webster]

   {Quaking aspen} (Bot.), an American species of poplar
      ({Populus tremuloides}), the leaves of which tremble in
      the lightest breeze. It much resembles the European aspen.
      See {Aspen}.

   {Quaking bog}, a bog of forming peat so saturated with water
      that it shakes when trodden upon.

   {Quaking grass}. (Bot.)
   (a) One of several grasses of the genus {Briza}, having
       slender-stalked and pendulous ovate spikelets, which
       quake and rattle in the wind. {Briza maxima} is the large
       quaking grass; {Briza media} and {Briza minor} are the
       smaller kinds.
   (b) Rattlesnake grass ({Glyceria Canadensis}).
       [1913 Webster]