[Wikipedia] Australia Native: Leptospermum laevigatum, commonly known as the coast tea tree, is a species of shrub or small tree that is endemic to south-eastern Australia, but has been widely introduced in other places where it is often considered to be a weed. It has thin, rough bark on the older stems, narrow egg-shaped leaves, relatively large white flowers and flat topped fruit that is shed shortly after reaching maturity. (link added by Mary Ann Machi)

[Cal-IPC] Invasiveness: Leptospermum laevigatum (Australian tea tree) is a shrub (family Myrtaceae) with white flowers and narrow leaves found in the San Francisco Bay area and central and south coast ranges of California. It is native to southeastern Australia. It grows in dunes. Its seeds are spread via wind, vehicles, soil movement, water and dumped garden waste. (link added by Mary Ann Machi)