Emodin, chrysophanol, physcion, knipholone and two new bianthraquinones, 10-hydroxy-10- (physcion-7'-yl)-chrysophanol anthrone and 5,10-dihydroxy-2-methyl-9-(physcion-7'-yl)-l,4-anthraquinone, are reported from the pods of Senna didymobotrya. Knipholone is isolated from the genus Senna for the first time. The compounds are identified on the basis of their colour reactions, comparison with authentic samples and spectroscopic data.