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From The Collaborative International Dictionary of English v.0.48:
Blue grass \Blue" grass`\ (Bot.) A species of grass (Poa compressa) with bluish green stems, valuable in thin gravelly soils; wire grass. [1913 Webster] Kentucky blue grass, a species of grass (Poa pratensis) which has running rootstocks and spreads rapidly. It is valuable as a pasture grass, as it endures both winter and drought better than other kinds, and is very nutritious. [1913 Webster]