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]