In addition to isoorientin, vicenin-2, hypolaetin, lucenin-1, luteolin 7-O-glucoside and 7-O-neohesperidoside, the aerial parts of Mentha longifolia yielded three new flavonoids, identified as tricetin 7-O-methylether 3'-O-glucoside 5'-O-rhamnoside (1), tricetin 3'-O-glucoside 5'-O-rhamnoside (2) and tricetin 3'-O-rhamnosyl-(1 --> 4)-rhamnoside (3). (C) 1999 Elsevier Science B.V. AU rights reserved.