CR

Citrus undulata

Unknown

Overview

Citrus undulata, synonym Oxanthera undulata, the wavy-leaf oxanthera, is a species of plant in the family Rutaceae. It is endemic to New Caledonia. Oxanthera undulata is classified as critically endangered by the IUCN.

Citrus undulata faces severe population decline due to habitat destruction from agricultural expansion and urban development in its native range. The species is particularly vulnerable to hybridization with commercial citrus cultivars, which threatens genetic integrity of remaining wild populations. Climate change and altered precipitation patterns further stress the limited remaining stands of this wild citrus.

Threat summary

Habitat

This wild citrus species inhabits subtropical montane forests and forest edges at elevations between 800-1,500 meters. It typically grows in well-drained soils along ridgelines and in clearings within primary and secondary forest ecosystems.

Other threatened species in RUTACEAE

CR

Melicope quadrangularis

Declining
VU

Melicope wawraeana

Declining
VU

Vepris drummondii

Declining
VU

Zanthoxylum mildbraedii

Declining

Frequently asked questions

Why is Citrus undulata classified as Critically Endangered?
Citrus undulata is classified as Critically Endangered — facing an extremely high risk of extinction in the wild — because population sizes are very small, declining sharply, or restricted to a tiny range. Citrus undulata faces severe population decline due to habitat destruction from agricultural expansion and urban development in its native range. The species is particularly vulnerable to hybridization with commercial citrus cultivars, which threatens genetic integrity of remaining wild populations. Climate change and altered precipitation patterns further stress the limited remaining stands of this wild citrus.
Where does Citrus undulata live?
Citrus undulata occurs in across multiple regions. Country-level distribution data is sourced from the IUCN Red List and cross-referenced with GBIF occurrences.
What are the main threats to Citrus undulata?
The main threats to Citrus undulata are ai-1, ai-2, ai-3, and ai-4. The full IUCN-classified threat record for this species is detailed on the species page.

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