Eucalyptus is a large genus of the Myrtaceae family that includes some 900 species and subspecies (Brooker & Kleinig, 2004). Although Eucalyptus is widely grown in many countries all over the world, Australia is probably the only one where such a single group of plants dominate most of the landscape. The Aborigines, believed to have settled in Australia over 60,000 years ago, developed a sophisticated empirical understanding of indigenous plants such as Eucalyptus. They traditionally used its leaves to heal wounds and fungal infections. While much of this knowledge has vanished with its keepers, there is currently a renewed interest in native herbal traditions (Chevallier, 2001).