Illinois bundleflower (Desmanthus illinoensis) is a promising perennial for forage and grain production in the Midwest. This herbaceous warm-season legume is indigenous to the North American prairies. We measured forage and seed yield and quality of Illinois bundleflower in a replicated field experiment in two central Iowa locations during two years under two harvest managements. Results varied with location, year, and management. Forage yield of Illinois bundleflower ranged from 0.3 to 1.5 Mg.ha^-1 in the three cuts management and from 1.0 to 2.8 Mg.ha^-1 in the one cut management. Forage quality of Illinois bundleflower is comparable with alfalfa, with crude protein values ranging from 22.7 % to 30.2 % in early summer and 10.4 % to 18.4 % in late fall, and NDF values of 28.0 % to 39.5 % in summer and 24.5 % to 39.4 % in fall. Seed yields of Illinois bundleflower ranged from 0.1 to 5.1 Mg.ha^-1 of seed with 41 % crude protein content. Mixtures of Illinois bundleflower with grasses like orchardgrass or intermediate wheatgrass yielded from 0.9 to 4.2 Mg.ha^-1 in the three cuts management and from 2.4 to 5.2 Mg.ha^-1 in the one cut management. Illinois bundleflower both in monoculture and mixtures with grasses can produce acceptable forage quality and seed yield in Iowa. With proper breeding efforts to increase forage and seed yields this species could become a sustainable alternative for farmers in the Midwest.