North American grass with slender brushy panicles; often a weed on cultivated land.

synonyms: old witch grass, old witchgrass, Panicum capillare, tumble grass, witchgrass.

European grass spreading rapidly by creeping rhizomes; naturalized in North America as a weed.

synonyms: Agropyron repens, couch grass, dog grass, quack grass, quackgrass, quick grass, witchgrass.

Polish: perz właściwy