Poa nemoralis

Poa nemoralis, the wood bluegrass, is a perennial plant in the Poaceae family. The late-growing grass is fairly nutritious for livestock, which feed on it in the autumn.
It is often found in forests and grows up to half a metre tall. It is generally distributed in Britain in dry woods, thickets and shady hedge banks on well drained soils. It is an introduced species in North America.