Briza media

Briza media is a perennial grass in the family Poaceae and is a species of the genus Briza. Common name includes quaking-grass, common quaking grass, cow-quake, didder, dithering-grass, dodder-grass, doddering dillies, doddle-grass, earthquakes, jiggle-joggles, jockey-grass, lady's-hair, maidenhair-grass, pearl grass, quakers, quakers-and-shakers, shaking-grass, tottergrass, and wag-wantons....read more on Wikipedia.