Panicum repens is a species of grass known by many common names, including torpedograss, creeping panic, panic rampant, couch panicum, wainaku grass, quack grass, dog-tooth grass, and bullet grass. Its exact native range is obscure. Sources suggest that the grass is native to 'Africa and/or Asia', 'Europe or Australia', 'Eurasia', 'Australia', 'Europe, Asia, and Africa', or other specific regions, including the Mediterranean, Israel, and Argentina. It is present in many places as an introduced species ...