The constituents of essential oil isolated by hydro distillation of the aerial parts of Callistemon pallidus, Myrtaceae family, from
Ethiopia was examined by GC-MS. A total of 13 components were identified accounting for 81.58% of the oil of C.pallidus. The oil
contained, as the main components, 1, 8-cineloe (56.75%), caryophyllene (3.78%), caryophyllene oxide (2.89%), ? -pinene (2.87%),
3-carene (2.54 %), cubenol (2.09%) and fenchol(1.91%). The essential oil of C.pallidus exhibited significant anti bacterial activity
against gram positive (Staphylococcus auerus) than gram negative bacteria (Escherichia coli).