Diarrhena americana

Diarrhena americana, also known as American beak grass or American beakgrain, is a native, perennial bunchgrass of North America.

Historically, Diarrhena americana was the only species of beak grass recognized in the United States; however studies have suggested that the known beak grass is to be classified into two distinct species, Diarrhena americana and Diarrhena obovata.