(Hillebr.) T.G.Hartley & B.C.Stone
Melicope knudsenii, commonly known as Olokele Valley melicope or Knudsen's melicope, is a species of flowering plant in the citrus family, Rutaceae, that is endemic to Hawaii. It inhabits montane mesic forests dominated by Acacia koa, Metrosideros polymorpha, and Dicranopteris linearis on Kauaʻi (Olokele Valley and Waimea Canyon) and East Maui (Auwahi). Associated plants include Syzygium sandwicensis, Cheirodendron trigynum, Myrsine lessertiana, Ilex anomala, Alphitonia ponderosa, Zanthoxylum dipetalum, Kadua terminalis, Pleomele aurea, Bobea spp., Tetraplasandra waimeae, Xylosma hawaiiense, Eurya sandwicensis, Psychotria mariniana, Melicope anisata, Melicope barbigera, Pouteria sandwicensis, Dodonaea viscosa, and Dianella sandwicensis. It is threatened by habitat loss. Like other Hawaiian Melicope, this species is known as alani. This is a federally listed endangered species of the United States.
This tree is very rare today, existing only on the islands of Kauai and Maui in small numbers. By 2008 there were three individuals remaining on Kauai. A 1999 survey reported only a single wild individual remaining on Maui, and one cultivated tree in an arboretum. The latter is producing seeds, which are being collected. The seedlings will be planted in appropriate habitat.
- World Conservation Monitoring Centre 1998. Melicope knudsenii. 2006 IUCN Red List of Threatened Species. Downloaded on 22 August 2007.
- "Melicope knudsenii". Natural Resources Conservation Service PLANTS Database. USDA. Retrieved 6 July 2015.
- "Alani Melicope knudsenii" (PDF). Hawaii's Comprehensive Wildlife Conservation Strategy. Division of Forestry and Wildlife. Retrieved 2011-03-01.
- USFWS. Species Reports: Plants.
- Melicope knudsenii. The Nature Conservancy.
- USFWS. Melicope knudsenii Five-year Review. July 2009.
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