Euphorbia rockii


Taxonomy [top]

Kingdom Phylum Class Order Family

Scientific Name: Euphorbia rockii
Species Authority: C.N.Forbes
Chamaesyce rockii (C.N.Forbes) Croizat & O.Deg.

Assessment Information [top]

Red List Category & Criteria: Critically Endangered C2a(i) ver 3.1
Year Published: 2003
Date Assessed: 2003-04-30
Needs updating
Assessor(s): Bruegmann, M.M. & Caraway, V.
Reviewer(s): Maunder, M. (Plant Conservation Committee) & Pollock, C.M. (Red List Programme Office)
Chamaesyce rockii is endemic to the island of Oahu, Hawaii. It is known from less than 10 subpopulations, totaling 200–300 individuals. The species and its habitat are threatened by alien plants and feral pigs.
1998 Endangered (Oldfield et al. 1998)
1998 Endangered
1997 Endangered (Walter and Gillett 1998)

Geographic Range [top]

Range Description: Chamaesyce rockii is endemic to the Hawaiian Islands. It is confined to the Koolau Mountains.
United States (Hawaiian Is.)
Range Map: Click here to open the map viewer and explore range.

Population [top]

Population: Between 200 and 400 plants are estimated to exist in fewer than 10 subpopulations.
Population Trend: Decreasing

Habitat and Ecology [top]

Habitat and Ecology: Usually a compact shrub but sometimes a tree. Scattered in rainforest and shrublands, primarily along cloudswept ridges up to 830 m.
Systems: Terrestrial

Threats [top]

Major Threat(s): The vegetation is liable to be damaged or degraded by feral pigs and invasive plants (strawberry guava and Koster's curse). Impacts from human activities, such as military activities, also pose a possible threat to the species.

Conservation Actions [top]

Conservation Actions: C. rockii is being propagated at the Lyon Arboretum (G. Koob, pers. comm. 1997).
The species is listed under the US Endangered Species Act.

Citation: Bruegmann, M.M. & Caraway, V. 2003. Euphorbia rockii. The IUCN Red List of Threatened Species. Version 2014.3. <>. Downloaded on 28 March 2015.
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