Abstract The essential oil from Erigeron acris L. obtained by hydrodistillation was analyzed by GC and GC/MS techniques. Over 60 compounds were identified, representing 92.6% of the total components. The major constituents of the oil were monoterpenoid hydrocarbons [limonene, β-pinene, (E)-β-ocimene] and sesquiterpenoid hydrocarbons [α-muurolen, germacrene D, (E)-β-farnesene]. Key Word Index: Erigeron acris Asteraceaeessential oil compositionlimonene(E)-β-ocimene