Melicope quadrangularis (St.John & Hume) T.G.Hartley & B.C.Stone



Taxonomy & Nomenclature

Synonym/s: Pelea quadrangularis


Conservation Status

Last record: 20 May 1991

Rediscovered in 19 Nov 2013

IUCN RedList status: Critically Endangered


Rediscovered twice: 1909-1991 / 20 May 1991-19 November 2013



Kauai, Hawaiian Islands, USA


Biology & Ecology










Humphreys, Aelys M., Govaerts, Rafaël, Ficinski, Sarah Z., Lughadha, Eimear Nic and Vorontsova, Maria S. (2019). Global dataset shows geography and life form predict modern plant extinction and rediscovery. Nature Ecology & Evolution 3: 1043-1047. [Abstract] [Supplementary Dataset 1]

Imada, C.T., Wagner, W.L. and Herbst, D.R. 1989. Checklist of native and naturalized flowering plants of Hawaii. Bishop Museum Occasional Papers 29: 1-87.

Lorence, D.H., T.W. Flynn, and W.L. Wagner. 1995. Contributions to the flora of Hawai`i. III. New additions, range extensions, and rediscoveries of flowering plants. Bishop Museum Occasional Papers 41: 19-58.

Oldfield, Sara, Lusty, Charlotte and MacKinven, Amy (compilers). (1998). The World List of Threatened Trees. Cambridge, U.K.: World Conservation Press. 650 pp.

POWO. 2018. Plants of the World online. Facilitated by the Royal Botanic Gardens, Kew.

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

U.S. Fish and Wildlife Service. 1995. Recovery plan for the Kaua'i plant cluster. Portland, Oregon: U.S. Fish and Wildlife Service.

USFWS. 2003a. Recovery Report to Congress: Fiscal Years 1997-98 and 1999-2000. United States Fish and Wildlife Service, Washington, D.C.

USFWS. 2003b. Final Designation or Nondesignation of Critical Habitat for 95 Plant Species From the Islands of Kauai and Niihau, HI. United States Fish and Wildlife Service, February 27, 2003, 68 FR 9116.

Wagner, W., Herbst, D. and Sohmer, S. 1990. Manual of the flowering plants of Hawaii. University of Hawaii Press, Bishop Museum Press, Honolulu.

Wood, Kenneth R. (2009). Further Notes on Melicope quadrangularis (Rutaceae) Kaua‘i, Hawai‘i. Biological Report, National tropical Botanical Garden (NtBG), Kalaheo, HI. 6 pp. Available from NtBG.

Wood, Kenneth R. (2011). Rediscovery, conservation status and taxonomic assessment of Melicope degeneri (Rutaceae), Kaua‘i, Hawai‘i. Endangered Species Research 14: 61-68.

Wood, Kenneth R. (2012). Possible Extinctions, Rediscoveries, and New Plant Records within the Hawaiian Islands. Records of the Hawaii Biological Survey for 2011. Edited by Neal L. Evenhuis & Lucius G. Eldredge. Bishop Museum Occasional Papers 113: 91-102.

Wood, Kenneth R. and Kirkpatrick, Megan. (2014). Rediscovery of Melicope quadrangularis (Rutaceae) and other notable plant records for the island of Kaua‘i, Hawai‘i. Records of the Hawaii Biological Survey for 2013. Edited by Neal L. Evenhuis. Bishop Museum Occasional Papers 115: 29-32.

World Conservation Monitoring Centre. (1998). Melicope quadrangularis. The IUCN Red List of Threatened Species. Version 2014.3. ( Downloaded on 10 May 2015.


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