............................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 金合歡屬豆科。灌木,高2~4m;枝具刺,刺長可達(dá)1~2cm。二回羽狀復(fù)葉,羽片4~8對,每羽片具小葉10~20對,小葉片線狀長橢圓形。頭狀花序腋生,直徑1.5cm,常多個(gè)簇生。莢果圓柱形,長3~7cm,直徑8~15mm。種子多數(shù),黑色。常為二回羽狀復(fù)葉。許多澳大利亞種及太平洋種的葉小或缺;葉柄扁平,代行葉片的生理功能;葉柄可垂直排列,基部有棘或尖刺。花小,通常芳香,聚生成球形或圓筒形的簇;花多為黃色,偶為白色;雄蕊多數(shù),使花朵外形呈絨毛狀。莢果扁平或圓柱形,種子間?O縮。頭狀花序簇生于葉腋,盛開時(shí),好像金色的絨球一般