Melaleuca alternifolia, commonly known as narrow-leaved paperbark, narrow-leaved tea-tree, narrow-leaved ti-tree, or snow-in-summer, is a species of tree or tall shrub in the myrtle family, Myrtaceae. Native to Australia, it occurs in southeast Queensland and the north coast and adjacent ranges of New South Wales. It grows along streams and on swampy flats, and is often the dominant species where it occurs.