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Chamaesyce rockii

Chamaesyce rockii (Forbes) Croizat & O. Deg.

Koolau Range Sandmat

Euphorbiaceae (Spurge Family)

Synonym(s): Euphorbia rockii

USDA Symbol: CHRO2

USDA Native Status: HI (N)

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. The species is listed under the US Endangered Species Act. (Bruegmann, M.M. & Caraway, V. 2003. Chamaesyce rockii. In: International Union for the Conservation of Nature, 2011. IUCN Red List of Threatened Species. Version 2011.1.)


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Plant Characteristics

Duration: Perennial
Habit: Tree
Leaf Pubescence: Glabrous
Leaf Margin: Entire
Breeding System: Flowers Unisexual
Inflorescence: Cyme
Fruit Type: Capsule
Size Notes: Up to about 12 feet tall in optimum conditions, usually much shorter.
Fruit: Red capsules, seeds brown to grayish-brown.

Bloom Information

Bloom Color: Red , Yellow , Green
Bloom Time: Jan , Feb , Mar , Apr , May , Jun , Jul , Aug , Sep , Oct , Nov , Dec


Native Distribution: The island of Oahu, Hawaii, endemic.
Native Habitat: Rainforest and shrublands, primarily along cloudswept ridges up to 830 m.

U.S. Fish & Wildlife Service Threatened & Endangered Status

USFWS Species Profile: Q3GO
Status: Endangered
Historic Range: U.S.A. (HI)
Critical Habitat: 17.96(a)
Special Rules: N/A
This information is derived from the U.S. Fish & Wildlife Serrvice Environmental Conservation Online System.

National Wetland Indicator Status

Status: FACU
This information is derived from the U.S. Army Corps of Engineers National Wetland Plant List, Version 3.1 (Lichvar, R.W. 2013. The National Wetland Plant List: 2013 wetland ratings. Phytoneuron 2013-49: 1-241). Click here for map of regions.

Web Reference

Webref 43 - Hawaiian Native Plant Genera (2006) University of Hawaii

Additional resources

USDA: Find Chamaesyce rockii in USDA Plants
FNA: Find Chamaesyce rockii in the Flora of North America (if available)
Google: Search Google for Chamaesyce rockii


Record Modified: 2022-12-09
Research By: TWC Staff

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