Antibacterial activity and chemical composition of 20 Eucalyptus species' essential oils

► Ten chemotypes were identified. ► E. cinerea was the richest species in 1,8-cineole and E. odorata was the richest species in cryptone. ► E. odorata was the most active against Staphylococcus aureus. ► Antibacterial activity was correlated with 1,8-cineole, p-cymene, α-pinene, or cryptone amount.