OUTGROUPIguanodonOuranosaurusTelmatosaurusEdmontosaurusAnatosaurusGryposaurusMaiasauraBrachylophosaurusProsaurolophusSaurolophusParasaurolophusLambeosaurusCorythosaurusHypacrosaurusOsteologyMaximum ParsimonyBased on reanalysis of the original matrix.Weishampel_etal_1993a