Abstract Essential oils of Baccharis articulata (Lam.) Pers. produced from plants harvested at full flowering were examined by GC and GC/MS. The main components for the female plant oil were, Î²-pinene (14.7%), spathulenol (27.3%) and (E)-nerolidol (10.1%); the male plant oil contained spathulenol (30.3%), Î²-caryophyllene (9.5%), bicyclogermacrene (8.9%) and (E)-nerolidol (8.1%).