Taxonomy

Thiollierea retusiflora (Brongn.) Barrabé & Mouly
endemique
UICN

Synonyms

Grisia retusiflora Brongn.Bikkia retusiflora (Brongn.) Schltr.

Red List Status -

Vulnerable (VU) , assessed in 21/04/2017

Thiollierea retusiflora is an endemic shrub of New Caledonia, found in Grande Terre from Col de Hô to Camp des Sapins. It occurs in forest or shrubland on ultramafic substrate at an altitudinal range of 100-600 m asl. Ongoing mining activities impact some subpopulations. The habitat of Thiollierea retusiflora is moreover degraded by bushfires. Its area of occupancy (AOO) and extent of occurrence (EOO) are respectively estimated to be 44 and 1,133 km², while the number of locations is estimated to be eight. Thiollierea retusiflora is therefore assessed as Vulnerable (VU) with criteria B1ab(i,ii,iii,iv,v)+2ab(i,ii,iii,iv,v) with a continuing decline of all concerned sub-criteria.

Geographical area


Thiollierea retusiflora is an endemic shrub, found in Grande Terre from Col de Hô in the north to Camp des sapins in the south of New Caledonia.

Population


Population size is unknown. It is known from nine subpopulations: Col de Hô, Cap Bocage, Versant nord-est du Cap Bocage, Kouaoua:Ndouvéra, Massif de Bogota, Canala, Thio:Ton N'Deu, Forêt de Sailles, and Camp des Sapins.

Habitat


Thiollierea retusiflora occurs in forest or shrubland on ultramafic substrate at an altitudinal range of 100-600 m asl.

Threats


Ongoing mining activities impact some subpopulations. The habitat of Thiollierea retusiflora is moreover degraded by bushfires. Some subpopulations may be threatened by mining activities: Plateau (SLN), Camp des sapins (SLN), Cap Bocage (SMT).

Conservation


Unprotected by legislation, Thiollierea retusiflora does not occur in any protected area. This species would benefit from ex-situ and in-situ emergency conservation actions. It is recommended to inform the DSCGR (emergency services), responsible for the coordination of the firefighting effort on the presence of the species in the concerned areas.

Bibliography


Morat, P.; Jaffré, T.; Tronchet, F.; Munzinger, J.; Pillon, Y.; Veillon, J.-M. and Chalopin, M. 2012. Le référentiel taxonomique Florical et les caractéristiques de la flore vasculaire indigène de la Nouvelle-Calédonie [The taxonomic database « FLORICAL » and characteristics of the indigenous flora of New Caledonia]. Adansonia sér 3(34) , p.177-219.

Endemia.nc 2016. Faune et Flore de Nouvelle-Calédonie.

Barrabé L., Mouly A., Lowry II P.P. & Muzinger J. 2011. Reinstatement of the endemic New Caledonian genus Thiollierea Montrouz. (Rubiaceae) necessitated by the polyphyly of Bikkia Reinw. as currently circumscribed. Adansonia(33) , p.115-134.

Experts


Assessor(s): Barrabé, L., Amice, R., Bruy, D., Butin, J., Fleurot, D., Garnier, D., Gâteblé, G., Goxe, J., Héquet, V., Lannuzel, G., Suprin, B., Veillon, J.

Reviewer(s): Cazé, H.

Contributor(s): Mouly, A.

Facilitator(s): Warimavute, G., Maura, J., Tanguy, V.


Geographical distribution