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, wag-wantons
Description.
Grows to 40cm and flowers June to September in the UK. Characterised by fine stems and hops-shaped green and purple spikelets. Distinguished from the closely related Briza maxima by the size of the flower spikelets.
Distribution and habitat.
This grass species is common in England and Wales It grows in dry calcareous grassland. Its seeds are consumed by many farmland birds.