Diarrhena

Diarrhena, or beakgrain, is a genus of Asian and North American plants in the grass family.
; Species

Diarrhena americana P. Beauv. - east-central United States
Diarrhena fauriei Ohwi - Shandong, Jilin, Heilongjiang, Liaoning, Japan, Korea, Primorye
Diarrhena japonica Franch. & Sav. - Japan, Jeju-do, Kuril, Jilin, Heilongjiang, Liaoning
Diarrhena mandshurica Maxim. - Jilin, Heilongjiang, Liaoning, Primorye, Amur, Khabarovsk, Korea, Hebei, Shanxi
Diarrhena obovata Brandenburg - Ontario, east-central United States

; formerly included
see ''Ammophila Catabrosa Cutandia Sphenopus Vulpia''