The investigation of Ageratum corymbosum resulted in the isolation of four new highly oxygenated flavonoids, and their structures established by spectroscopic and degradative evidence as 5,6,7,5'-tetramethoxy-3',4' methylenedioxyflavanone; 5,6,7,8,5'-pentamethoxy-3',4'-methylenedioxyflavanone: 5,6,7,8,2',4',5'-heptamethoxyflavone and 5,2',4'-trihydroxy-6,7,8,5'-tetramethoxyflavone. The recently reported gardenin A monomethyl ether and 5'-methoxylucidin dimethyl ether (eupalestin) were also isolated.