Notes on New Caledonian Pandanaceae: Identity and typifications of Pandanus decumbens (Brongn.) Solms and Pandanus reticulatus Vieill., with the new species Pandanus letocartiorum Callm. & Buerki

The identity of three endemic New Caledonian species of Pandanaceae is resolved: Pandanus decumbens (Brongn.) Solms, Pandanus neocaledonicus Martelli and Pandanus reticulatus Viell. After careful examination of the relevant collections and the rediscovery of the fragmentary type of Pandanus neocaledonicus, the latter is now considered to be a synonym of Pandanus decumbens. A new species is described, Pandanus letocartiorum Callm. & Buerki, which is characterized by its habit, drupes and stigmas. The two accepted species and the new species are described in detail and their taxonomic affinities are discussed. A lectotype is designated for Pandanus neocaledonicus, and a neotype is chosen for Pandanus reticulatus. A preliminary IUCN risk of extinction assessment for each species is also provided along with colour pictures and line drawings.