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Arrhenatherum elatius, tall oatgrass, is a perennial, cool-season bunchgrass generally grown in Europe where it once was a component of the grasslands. Culms are erect, from 3 to 5 feet tall. Leaf blades, from 3/8 to 3/4 inches wide, are flat and rough to the touch. Seed heads are narrow panicles 6 to 10 inches long with long, twisted, angled, exposed awns.