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The Allan Herbarium is the biggest herbarium in the New Zealand network. Most of the specimens in all these herbaria are from the New Zealand botanical region but, by exchanging specimens with overseas herbaria, plant specimens from other areas of the world are also accumulated. These expanded collections allow comparisons and identification of exotic plants to be made. Material is exchanged with overseas herbaria to provide specimens for comparative study, especially from the South Pacific region. The New Zealand National Herbarium Network is a member of the Council of Heads of Australasian Herbaria (CHAH).