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Baccharis (Asteraceae) is an important genus in various parts of South America. It is composed of about 400 species, of which 36 have been described in Chile (1), 110 in Argentina (2), and 131 in Brazil (3). Twenty species of Baccharis have been examined for flavonoids (4).In this communication, we report the isolation and characterization of three methoxyflavones in Baccharis patens Wedd. from Brazil: 5,4'-dihydroxy-6, 7, 8-trimethoxyflavone (xanthomicrol), 5, 3', 4'-