Four quinoline alkaloids were isolated from stems of Galipea bracteata. In addition to one new compound, 2-(3′,4′-methylenedioxyphenylethyl)-quinoline, three were identified as the known compounds 2-n-propylquinoline, 2- n-pentylquinoline and 2-(1′-pentenyl)-quinoline. However, this is the first report of their isolation from a natural source. All alkaloids showed an inhibitory effect on shoot and root growth of lettuce (Lactuca sativa). Three of them also showed molluscicidal activity against the aquatic snail, Biomphalaria glabrata, involved in the transmission of schistosomiasis. © 1990.