Red List Status -Vulnerable (VU) , assessed in 08/09/2017
Oxera crassifolia is an endemic sub-shrub of New Caledonia. This species is rare, being restricted to the high mountain massifs of southern Grande Terre and only known from three locations (Mt. Humboldt, Kouakoué, Montagne des Sources). It is found in altitudinal shrubland on ultramafic substrate between 900 and 1,550 m asl. Its area of occupancy (AOO) is only 20 km², population size is unknown, and the species could be affected by feral pigs (Sus scrofa) and fires. Therefore, O. crassifolia is listed as Vulnerable (VU) under criterion D2.
O. crassifolia is endemic to New Caledonia. It is restricted to the southern high mountain massifs of Grande Terre, and only known from three locations: Humboldt, Kouakoué and Montagne des Sources.
Population size is unknown but field observations indicate that populations are small.
O. crassifolia occurs in altitudinal scrubland on ultramafic substrate from 900 to 1,550 m asl.
This species does not seem directly threatened because of its altitudinal habitat. However, evidence of fires has been observed in Montagne des Sources and therefore constitutes a potential threat, as well as feral pigs (Sus scrofa), which impact habitat quality.
This species is not protected by any legislation in New Caledonia but it does occur in four protected areas: Massif du Kouakoué, Mont Humboldt, Haute Yaté and Montagne des Sources. It is proposed to monitor known populations and to inform the local authority responsible for the coordination of the firefighting effort about the presence of the species in the concerned areas. Prospection at Boirou, Néaoua and Katrikoin-Kouaoua is also recommended to determine the size of the population and better understand potential threats. Finally, knowledge improvement on the species (multiplication tests) would also be needed for ex situ conservation.
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.
Gâteble G. 2016. Flore ornementale de Nouvelle-Calédonie.
Barrabé L, Karnadi-Abdelkader,G, Ounemoa,J,de Kok RPJ., Robert N, Gâteble,G. 2015. Recircumscription of Oxera (Lamiaceae: Ajugoideae) ta include Faradaya based on molecular and anatomical data. Botanical Journal of the Linnean Society(179) , p.693-711.
Mabberley DJ, de Kok RPJ. 2004. Labiatae. In: Morat P,ed. Flore de la Nouvelle-Calédonie et dépendance.
Assessor(s): Gâteblé, G., Barrabé, L., Fleurot, D., Amice, R., Cazé, H., Bruy, D., Hequet, V., Vandrot, H., Butin, J., Mandaoué, L., Haverkamp, C., Dumontet, V., Laudereau, C.
Reviewer(s): Meyer, S.
Facilitator(s): Warimavute, G., Tanguy, V.