"The family Myrtaceae contains many plants, including the Australian tea tree (Melaleuca alternifolia) and its New Zealand equivalents manuka (Leptospermum scoparium) and kanuka (Kunzea ericoides, formerly Leptospermum ericoides), ".
http://lpi.oregonstate.edu/f-w98/teatrees.html
http://www.sefit.es/monografia-ema-sobre-aceite-esencial-melaleuca/