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This paper is a further contribution to the naturalised flora of Tonga in documenting 19 species newly recognised from the archipelago. These 19 species are treated as the single broad category of naturalised whereby they form a wild population(s) self-maintained by seed or vegetative reproduction (following Webb et al. 1988).

Recent field surveys of the flora of Niue have identified three new species records for the island. Erigeron bellioides DC. (Asteraceae) and Psidium cattleyanum Sabine (Myrtaceae) are new naturalised records and Crepidomanes saxifragoides (C.Presl) P.S.Green (Hymenophyllaceae) is an addition to the indigenous flora.