QUAKING GRASS, in botany: a genus of the digynia order, belonging to the triandra class of plants; and in the natural method ranking under the 4th order, Graminae. The calyx is two-valved, and multidentate; the spicula bifarious or spread to the two sides; with the small valves heart-shaped and blunt, and the inner one small in proportion to the rest. There are five species of briza; two of which are natives of Britain, viz. the media or middle quaking-grass, and the minor or small quaking-grass. They grow in pasture grounds.