Carex wahuensis herbstii T. Koyama

Herbst's sedge



Taxonomy & Nomenclature



Conservation Status

Missing (Wagner et al., 1999; Wood et al., 2019); "extinct or missing" (Suckling et al., 2004)

Last record: 1994 (Price, 2004; Suckling et al., 2004:48/63); 1995 (USFWS, 2003; Wood et al., 2019) [could not be verified by Suckling et al., 2004:48/63]


"Carex wahuensis ssp. herbstii is known only from a small cliff face leeward of the main spine of the Koolau Range, Oahu, Hawaii. It is listed as possibly extinct by Wagner et al. 1999. It was collected by Perlman and Obata in 1992 and Perlman in 1994. A 2003 USFWS database suggests that it was last seen in 1995, but provides no further information. We have been unable to verify the sighting thus regard 1994 as the last reliable observation."

(Suckling et al., 2004)



Moanalua Valley, Oʻahu, Hawaiian Islands, USA


Biology & Ecology










Kartesz, J. T. (1994). A synonymized checklist of the vascular flora of the United States, Canada, and Greenland. 2nd edition. 2 vols. Timber Press, Portland, OR.

NatureServe. (2017). NatureServe Explorer: An online encyclopedia of life [web application]. Version 7.1. NatureServe, Arlington, Virginia. Available (Accessed: November 25, 2017).

Price, J. (2004). Letter to Kieran Suckling, Center for Biological Diversity, from Johnathan Price, Smithsonian Institution Department of Botany, April 30, 2004.

Suckling, Kierán, Slack, Rhiwena and Nowicki, Brian. (2004). Extinct and the Endangered Species Act. Centre For Biological Diversity. 63 pp.

USFWS. 2003. Hawaiian Islands Plants: Listed and Candidate Species, as Designated under the U.S. Endangered Species Act (Updated 2003). United States Fish and Wildlife Service, Honolulu, HI.

Wagner, W.L., M.M. Bruegmann, D.R. Herbst, and J.Q.C. Lau. 1999. Hawaiian Vascular Plants at Risk:1999. Contribution No. 1999-023 to the Hawaii Biological Survey. Bishop Museum Occasional Papers: No. 60, 1999.

Walter, Kerry S. and Gillett, Harriet J. (eds.). (1998). 1997 IUCN Red List of Threatened Plants. Compiled by the World Conservation Monitoring Centre. Gland, Switzerland & Cambridge, UK: IUCN – The World Conservation Union. lxiv + 862 pp.

Wood, Kenneth R., Oppenheimer, Hank and Keir, Matthew. (2019). A checklist of endemic Hawaiian vascular plant taxa that are considered possibly extinct in the wild. National Tropical Botanical Garden, Technical Report #314.


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