Quaking aspen

from WordNet (r) 3.0 (2006)

quaking aspen
    n 1: Old World aspen with a broad much-branched crown;
         northwestern Europe and Siberia to North Africa [syn:
         {quaking aspen}, {European quaking aspen}, {Populus
         tremula}]

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]