Castanopsis acuminatissima

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Castanopsis acuminatissima
Scientific classification
Kingdom: Plantae
(unranked): Angiosperms
(unranked): Eudicots
(unranked): Rosids
Order: Fagales
Family: Fagaceae
Genus: Castanopsis
Species: C. acuminatissima
Binomial name
Castanopsis acuminatissima
(Blume) A.DC.
  • Castanea acuminatissima Blume
  • Quercus junghuhnii Miq.

Castanopsis acuminatissima is an evergreen tree native to Southeast Asia and New Guinea. It is known by a variety of common names over its range, including White Oak, New Guinea Oak, Papua New Guinea Oak, ki riung, ko-duai, ko-soi, ko-mat, meranak, and riung anak.[1]


Castanopsis acuminatissima is a large canopy tree, up to 40 meters in height. The trunk is markedly fluted, and sometimes buttressed. The bark is grey or pale brown, rough and fissured, less than 25 mm thick, with red under-bark.

Leaves are simple, 9.0-11.5 cm long and 2.5-3.5 cm wide, and arranged spirally along the branches. Fruits are simple nuts, 1–10 mm in diameter.[2]


Castanopsis acuminatissima ranges from southwestern China (Guizhou and Yunnan provinces) through Indochina (Laos, Myanmar, Thailand, Vietnam, and the Chittagong Hills of Bangladesh) and Malesia (Malaysia; the islands of Sulawesi, Java, Kalimantan, and Sumatra, in Indonesia; the islands of New Guinea (West Papua in Indonesia and Papua New Guinea) and New Britain (Papua New Guinea)).[3][4]


In New Guinea and New Britain, it is a predominant tree in the lower montane forests, lying between 900-1000 and 2000 meters elevation.[5] It can also be found at lower elevations on small-crowned hill forests, in association with Hopea papuana and the drought-tolerant Casuarina papuana.[6]


  1. ^ "Castanopsis acuminatissima", World Agroforestry Centre database, accessed May 26, 2008. [1]
  2. ^ "Castanopsis acuminatissima", Guide to Trees of Papua New Guinea, accessed May 26, 2008 [2]
  3. ^ "Castanopsis acuminatissima" NPGS/GRIN database, accessed May 26 2008
  4. ^ "Castanopsis acuminatissima", Guide to Trees of Papua New Guinea, accessed May 26, 2008 [3]
  5. ^ "Central Range montane rain forests". Terrestrial Ecoregions. World Wildlife Fund. Retrieved May 26, 2008. 
  6. ^ "Papua New Guinea" FAO Forestry country profiles - natural woody vegetation, accessed May 26, 2008. [4]