Species of large tree native to Australia, distinguished from other eucalyptus by having rough bark half way up the trunk, where white smooth bark appears, and leaves of a glossy dark green. It is a koala food tree, is cut for timber, but is mainly used commercially for its abundant, pungent oil, used in pharmaceuticals, as an antiknock agent in gasoline and for the manufacture of menthol. The common name, blackbutt, refers to appearance of the type specimen collected in 1794, which had a black base after fires.
