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Deux espèces nouvelles de Thiollierea Montrouz. (Rubiaceae), endémiques des massifs Nord-Ouest de la Grande Terre (Nouvelle-Calédonie)

Laure BARRABÉ & Dominique FLEUROT

fr Adansonia 43 (5) - Pages 37-47

Published on 08 March 2021

Two new species of Thiollierea Montrouz. (Rubiaceae), endemic to Northwestern New Caledonia

Two new species of Thiollierea Montrouz. (Rubiaceae, Chiococceae) endemic to New Caledonia are described and illustrated. Both belong to the group of species with large red and/or yellow flowers. Each one is micro-endemic of one to two ultramafic massifs in the northwestern coast of Grande Terre. Thiollierea papineaui Barrabé & Fleurot, sp. nov. ressembles T. lenormandii (N.Hallé & Jérémie) Barrabé & Mouly but differs in having compact uniflorous inflorescences with a shorter peduncle, and larger calyx lobes. Thiollierea naounarum Fleurot & Barrabé, sp. nov. is morphologically close to T. macrophylla (Brongn.) Baum-Bod. but it differs in having usually uniflorous inflorescences, foliaceous bracts, zygomorphic flowers, and warts on hypanthium. Additionally T. papineaui, sp. nov. is micro-endemic to the Tiébaghi massif and to the base of Mount Kaala, in the area of Karembé. Thiollierea naounarum Fleurot & Barrabé, sp. nov. has only been observed and collected to the base of the Kopéto massif. Thiollierea papineaui, sp. nov. is assessed as “Endangered” and T. naounarum Fleurot & Barrabé, sp. nov. as “Critically Endangered” using the IUCN Red List Categories and Criteria.


Keywords :

Chiococceae, New Caledonia, identification key, endemism, IUCN Red List, ultramafic substrate

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