In order to detect constituents with similar actions to rutin in the genus Lespedeza plants growing in Korea, twelve species were collected in Chung Buk and Kyung Ki Provinces and subjected to systematic extraction. When the extract was examined for flavonoid by adding flavonoid reagents, all the species gave positive cofirmatory tests. The examination of the flavonoid consitituents by T.L.C. gave the following results: as rutin-like constituents, quercetin was detected in L. cyrtobotrya, L. maritima and L. bicolor var. melanantha and eriodictin-like constituents were detected in seven species. Of those twelve species, five species, L. cuneata, L. cyrtobotrya, L. maritima, L. bicolor var. melanantha and L. patentibicolor were found to contain kaempferol. All of them appear to contain lespedin and eriodictiol.