Poa arida is a species of grass known by the common names plains bluegrass and prairie speargrass. It is native to North America, where it occurs throughout western and central Canada and the central United States. It is most common east of the Continental Divide; specimens west are often misidentifications.This perennial grass grows up to 80 centimeters tall. The inflorescence is usually compact, its spikelets containing 3 to 7 flowers each. The grass sometimes has rhizomes.
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