a warm-season perennial, Desmanthus illinoensis, having small brown legumes and fernlike leaves, native to North American prairies, glades, and pastures.
Illinois bun·dle·flow·er (bŭn'dl-flou'ər) n. A herbaceous perennial (Desmanthus illinoensis) having a somewhat woody base, bipinnate leaves, and whitish flowers. It is used regularly in prairie restoration projects in North America.