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Beak Grass has very distinctive grains that are large in size and oddly shaped. On this basis, it is easily distinguished from other grasses that are outside its genus. In the past, Beak Grass was considered a variety of American Beak Grass, or Diarrhena americana obovata. However, it is now considered a distinct species with a more northern range. In Illinois, Beak Grass is more common and widely distributed than American Beak Grass; the latter is restricted to the southern tip of Illinois, where it is rare. These two species can be distinguished from each other as follows


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© John Hilty

Source: Illinois Wildflowers

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