首次对加杨雄花序进行了系统研究 ,从其提取物的石油醚 (6 0～ 90℃ )部分、乙酸乙酯部分分离并鉴定了 15个化合物 ,本文报道 8个黄酮类成分 :乔松酮 (pinostrobin,1) ,高良姜素 - 3-甲氧基 (galangin- 3- m ethoxy,2 ) ,乔松素 (pinocermbin,3) ,白杨素 (chrysin,4) ,槲皮素 - 3,7-二甲氧基 (quercetin- 3,7- dimethoxy,5 ) ,鼠李素(rham netin,6 ) ,山柰酚 - 3-甲氧基 (kaempferol- 3- m ethoxy,7) ,芹菜素 (apigenin,8)和异阿魏酸甲酯 (methylisoferulate,9)。化合物 5、9为首次从杨属植物中分得 For the first time, we systematically studied the male inflorescence of C. japonicus, and separated and identified 15 compounds from the petroleum ether (60-90°C) and ethyl acetate fractions of their extracts. Eight flavonoids were reported in this paper: Cassonone ( Pinostrobin, 1), Galangin-3-Methoxy (2), Pinocermbin (3), Chrysin (4), Quercetin-3,7-Dimethyl Hydroxy(quercetin-3,7-dimethoxy,5),rhamnetin (rham netin,6), kaempferol-3-methoxyethanol (7), apigenin (apigenin,8) ) and methyl isoferulate (9). Compounds 5 and 9 were first isolated from populus