Abstract: The chemical constituents of Pithecellobium clypearia Benth.were isolated and purified by chromatographic methods over Sephadex LH-20 and silica gel column, and structures of eleven compounds were elucidated by spectral analysis,including UV,IR,MS, ¹H NMR, ¹³C NMR.There were galliic acid (1),ethyl gallate (2), p-hydroxybenzoie acid (3), kaempferol-3-O-α-L-rhamnopyranoside (4),quercetin-3-O-α-L-rhamnopyranoside (5),quercetin (6),5,3′,4′,5′-tetrahydroxyflavan-7-gallate (7),rutin (8),luteolin (9),myricetin-3-O-α-L-rhamnopyranoside (10),luteolin-7-O-β-D-glucopyranoside (11),respectively.Moreover,compounds 4 and 8 were reported for the first time from P.clypearia.

Key words: Pithecellobium clypearia Benth., chemical constituents, flavonoids, organic acids