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Japanese stiltgrass (Microstegium vimineum), or simply referred to as stiltgrass, is an annual grass that grows from 12 to 36 inches tall. Its narrow stem has segments separated by joints; each segment produces a leaf, and each has a silvery-pearlescent midvein and leaf margin. It was inadvertently introduced to the United States in 1919 in shipping packaging and has since become widespread.