Taupata (Coprosma repens), also known as mirror bush, looking-glass bush, New Zealand laurel or shiny leaf, is a weed in Australia, Norfolk Island, South Africa and the U.S.A. (California and Hawaii).[2] Pohutukawa (Metrosideros excelsa), sometimes called the New Zealand Christmas tree, is an invasive species in South Africa.[3] The biddy biddy (Acaena novae-zelandiae) is declared a noxious weed in the American states of Hawaii, California and Oregon.[4] New Zealand flax or harekeke (Phormium tenax) is an invasive species in some Pacific islands and in Australia.[5] Pohuehue (Muehlenbeckia complexa), also called wire vine, mattress vine and several other common names, is naturalised in Western Australia.[6] Although it is a valued garden plant, it can become a pest in suitable climates (e.g. San Francisco's Golden Gate National Recreation Area)[7] if not contained. Manuka (Leptospermum scoparium) and kanuka (Kunzea ericoides) were planted in Hawaii during the early 20th century and have infested several islands.[8] Ngaio (Myoporum laetum) forms dense thickets in coastal areas of Southern California and Mexico and is therefore a serious weed.[8]