Methods The components of essential oil in leaves,stems and flowers of Vitex negundo L.var.cannabifolia(Sieb.et Zucc.)Hand-Mazz were separated and identified by GC-MS.

• 方法采用水蒸气蒸馏法提取,运用毛细管气相色谱-质谱联用法结合计算机检索,对牡荆花、叶、茎的挥发油化学成分分别进行分析和鉴定,用面积归一化法测定各化合物在挥发油中的相对含量。