Infrequent to local in the lake area in dredged ditches, sloughs, and swamps. This grass affords protection and food for water birds, especially wild ducks, and it is now often planted for these purposes. The following are popular publications on this subject: Wild rice; its uses and propagation, by Brown and Scofield. U. S. Dept. Agric. Bur. Pl. Ind. Bull. 50: 1-23. 7 pl. 1903; Wild rice, by Fyles. Dept. Agric. Dominion of Canada, Bull. 42, n.s. 1-20. 1920; Propagation of wild-duck foods, by McAtee. U. S. Dept. Agric. Bull. 465. 1917.