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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]