Revisions of North American grasses: Isachne, Oplismenus, Echinochloa, and Chaetochloav. 22No. 3115–208
Hitchcock, A. S. 1920. "Revisions of North American grasses: Isachne, Oplismenus, Echinochloa, and Chaetochloa." Contributions from the United States National Herbarium, 22, (3) 115–208.