Abstract
The alkaloidal components of the leaves of three kinds of Erythrina plants (Leguminosae), Erythrina poeppigiana (Walp) O.F. COOK (E.umbrosa BELLO), Erythrina glauca WILLD., and Erythrina variegata L.collected in the Singapore Botanical Garden, were examined. As a result of this examination, five Erythrina alkaloids, erysotrine (IX), 11-hydroxy-erysotrine (XV), erythraline (IV), erythrinine (XVI), and erysodine (I), a benzyltetrahydroisoquinoline alkaloid, N-nororientaline (XVII), and an alkaloid of dibenz [d, f]-azonine-type, erybidine (XVIII), were respectively isolated and characterized.
