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In many parts of the Pacific, a reflex of the original Proto Malayo Polynesian root word *biRu denotes one or more species of fan palm. The Mäori reflex, a reduplicated form of the Proto-Polynesian root *piu (which elsewhere in Polynesia generally denotes the fan palm Pritchardia pacifica), is a term applied to four species of fern, three of which (Blechnum procerum, B. discolor, and Pneumanopteris pennigera) develop short trunks (up to a metre high in the case of P. pennigera), and the fourth (Blechnum novaezelandiae) has a profusion of broad fronds which can reach up to 3 metres in length in ideal situations.
While they share the designation of a single name inherited from earlier stages of the Polynesian language, each of these ferns is also known by other, locally developed names. The Blechnum species are endemic to New Zealand; the Pneumanopteris is also found natively in Australia. Blechnum novaezelandiae has the largest number of alternative names (perhaps reflecting its variability and tendency to hybridize with some other Blechnum species): horokio, kiokio, korokio, koropiu (this incorporates the inherited root word), koropio, mokimoki, tupari and rautao; B. discolor is also known as petipeti, täniwhaniwha and turukio; B, procerum as kiokio (note the shared element, kio, in these sets of names); and Pneumanopteris pennigera as päkau and päkauroharoha.