A new species of Thiollierea Montrouz. (Rubiaceae) on mining land, micro-endemic of the Poum Massif (New Caledonia)

A new species of Thiollierea Montrouz. (Rubiaceae, Chiococceae) endemic to New Caledonia is described and illustrated. Thiollierea laureana Mouly belongs to the group of species with red and/or yellow flowers. This new taxon is morphologically close to Thiollierea neriifolia (Brongn.) Barrabe & Mouly but differs by its large oblanceolate leaves, solitary flower borne on a short peduncle lacking leafy bracts, and an hypanthium fluted by 10 discrete linear semi-cylindrical ribs. Thiollierea laureana is a New Caledonian micro-endemic, found only on the small ultramafic Poum massif, located at the northern tip of the largest island, Grande Terre. The new species is assessed as ``Critically Endangered'' using the IUCN Red List Categories and Criteria.