Two new saponins, 3-O-[β-D-glucuronopyranosyl-(1→2)-β-D-glucopyranosyl]hederagenin (named abrus-saponin I) and 3-O-[β-D-glucuronopyranosyl-(1→2)-β-D-glucopyranosyl]oleanolic acid 28-β-D-glucopyranosyl ester (abrus-saponin II), and three new flavones, 6-C-β-D-glucopyranosyl-4', 5-dihydroxy-7, 8-dimethoxyflavone (precatorin I), 6-C-[β-D-apiofuranosyl-(1→2)-β-D-glucopyranosyl]-4', 5-dihydroxy-7, 8-dimethoxyflavone (precatorin II), 6-C-[β-D-apiofuranosyl-(1→2)-β-D-glucopyranosyl]-4', 5-dihydroxy-7-methoxyflavone (precatorin III), were isolated from the seeds of Abrus precatorius L. together with twelve known compounds including a naturally new saponin, 3-O-[β-D-glucuronopyranosyl-(1→2)-β-D-glucopyranosyl]oleanolic acid. Their structures were determined on the basis of chemical and spectroscopic methods. In addition, the unusual NMR spectral behavior of the flavone C-glycosides is also discussed.