Poa pratensis

Poa pratensis, also Smooth Meadow-grass, Common Meadow Grass, or Kentucky Bluegrass, is a perennial species of the grass family "Poaceae". It is native to Europe, Asia, and northern Africa. It is tall.
"Poa pratensis" makes a useful pasture plant. It is also used for making lawns in parks and gardens. "Poa" is Greek for fodder, which is food fed to livestock.
The name Kentucky Bluegrass came from its blue flower heads.