Poa pratensis, commonly known as Kentucky bluegrass, smooth meadow-grass, or common meadow-grass, is a perennial species of grass native to practically all of Europe, northern Asia and the mountains of Algeria and Morocco. Although the species is spread over all of the cool, humid parts of the U.S., it is not native to North America. Early European colonists brought seed of Kentucky bluegrass to the New World in mixtures with other grasses. Poa pratensis (Wikipedia)