The essential oil of the aerial parts of Baccharis notosergila was examined
by CC and CC-MS. Thirty-one constituents were identified representing 96.4
% and alpha -pinene, limonene, beta -caryophyllene, and spathulenol were fo
und to be the major components. Furthermore, the oil was tested against eig
ht Gram-positive and -negative bacteria and it was found that they exhibite
d moderate antibacterial activity.