A New Species of (Argophyllaceae) with Notes on the Species from New Caledonia and Nickel Hyperaccumulation.

The taxonomy of (Argophyllaceae) in New Caledonia is reviewed here. All names validly published in in this archipelago are discussed and lectotypified when necessary. A new species is described, (The LSID for the name is: 77216335-1) Pillon and Hequet sp. nov. and are both species complexes in which several species previously recognized are included here as well. Seven species are recognized in New Caledonia: , , , , , and , all endemic. Leaf nickel content of can exceed 1000 μg·g, which makes this species a nickel hyperaccumulator. Measurements with a handheld X-Ray Fluorescence (XRF) spectrometer confirmed that this was also the case for all other species from New Caledonia, except . An identification key of New Caledonian species is provided.