Below are a series of photographs of a plant brought in for identification. The person who collected it noted that it was scattered around and not likely to be a problem, but because he had never seen it before he was curious. I had not seen it before either, but because of its unique features it was relatively easy to identify. Overall appearance resembles sedges, the inflorescence spike rush and the stem is nearly square in cross section. The scientific name is Eleocharis quadrangulata. The genus puts it in with spike rush. The species name describes the 4 angled stem. In my field notes I did not have a common name, but have since found one in the USDA Plants Database; it is appropriately called Squarestem Spikerush.