The Kermadec Islands are a remote volcanic group in the Pacific Ocean 960 kilometres north-east of New Zealand, about halfway between East Cape, North Island, and southern Tonga. Straddling latitude 30°S, the island group is the only subtropical part of New Zealand (it was annexed to the nation in 1887). The area is officially known as the Kermadec Nature Reserve and is under the protection of the Department of Conservation, which has a continuous physical presence on the principal island Raoul. One of the requirements for managing the islands as a nature reserve is up-to-date information on the existing plants and animals, both indigenous and adventive. This compilation of recently published papers with the standard floristic account of 1977 is intended to provide a single reference of the Kermadec flora to meet that need for plant data.