- witchgrass, witch grass, old witchgrass, old witch grass, tumble grass, Panicum capillare - North American grass with slender brushy panicles; often a weed on cultivated land
--1 is a kind of panic grass
- dog grass, couch grass, quackgrass, quack grass, quick grass, witch grass, witchgrass, Agropyron repens - European grass spreading rapidly by creeping rhizomes; naturalized in North America as a weed
--2 is a kind of wheatgrass, wheat-grass