Tea Tree: Melaleuca alternifolia
Part Used: Leaf
Method of extraction: Distillation 
Therapeutic properties: Tea tree oil is distilled from the leaves of the Melaleuca alternifolia plant, found in Australia. The oil possesses antibacterial, anti-inflammatory, antiviral, and antifungal properties. A person can treat acne, athlete's foot, contact dermatitis or head lice using tea tree oil.