Dried tuber of Dicentra (Bicuculla) cucullaria (L.) Bernh., or of Dicentra canadensis (DC.) Walp., Fumariaceae. Habit. Ontario to Kentucky and Missouri. Constit. Corydaline, bulbocapnine, isocorydine, corytuberine, corycavine, corybulbine, corydine, fumaric acid, acrid resin, protopine.