Gum tree (Noosa)
Eucalyptus is a diverse genus of flowering trees and shrubs in the myrtle family. Members of the genus dominate the tree flora of Australia, and include the tallest known flowering plant on Earth. There are more than 700 species of eucalyptus and most are native to Australia.
Eucalyptus oil finds many uses like in aromatherapy, as a cure for joint pains. Eucalyptus trees show allelopathic effects; they release compounds which inhibit other plant species from growing nearby.
On warm days, eucalyptus forests are sometimes shrouded in a smog-like mist of vaporised volatile organic compounds; the Australian Blue Mountains take their name from the haze. (Wikipedia)