Eucalyptus, aka Eucalyptus Globulus, is an evergreen tree native to Australia with leathery, aromatic, blue-green leaves. Eucalyptus is very fast-growing and can reach towering heights. Australian aborigines used eucalyptus leaf for its healthful properties for thousands of years. Eucalyptus leaves are typically prepared as a tea or tincture, but they can also be used in topical applications.