bluegrass, any species of the large and widely distributed genus Poa, chiefly range and pasture grasses of economic importance in temperate and cool regions. In general, bluegrasses are perennial with fine-leaved foliage that is bluish green in some species. One of the best known and most important is the sod-forming Kentucky bluegrass, or June grass ( P. pratensis ), believed to have been introduced from the Old World and now widely naturalized in the United States Kentucky is known as the Bluegrass State because this species is so prevalent there. Others are rough bluegrass ( P. trivialis ), used for shady lawns Sandberg bluegrass ( P. secunda ), the most common native species and big bluegrass ( P. ampla ), an important range grass. Bluegrass is classified in the division Magnoliophyta , class Liliopsida, order Cyperales, family Gramineae.

The Columbia Electronic Encyclopedia, 6th ed. Copyright © 2012, Columbia University Press. All rights reserved.

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