Australian Myrtle ~ Australian Myrtle, any of the evergreen shrubs in the genus Myrtus, belonging to the family Myrtaceae. Most occur in South America; some are found in Australia and New Zealand.The plant may grow more than 5 m (about 16.5 feet) high. In Greco-Roman antiquity, the common myrtle was held to be sacred to Venus and was used as an emblem of love in wreaths and other decorations