Dyera costulata

Classification System: APG IV

Superregnum: Eukaryota
Regnum: Plantae
Cladus: Angiosperms
Cladus: Eudicots
Cladus: Core eudicots
Cladus: Asterids
Cladus: Lamiids
Ordo: Gentianales

Familia: Apocynaceae
Subfamilia: Rauvolfioideae
Tribus: Alstonieae
Genus: Dyera
Species: Dyera costulata
Name

Dyera costulata (Miq.) Hook.f., 1882
Synonyms

Basionym
Alstonia costulata Miq., Fl. Ned. Ind., Eerste Bijv.: 556 (1861).
Heterotypic
Alstonia eximia Miq., Fl. Ned. Ind., Eerste Bijv.: 555 (1861).
Alstonia grandifolia Miq., Fl. Ned. Ind., Eerste Bijv.: 555 (1861).
Dyera laxiflora Hook.f., Fl. Brit. India 3: 644 (1882).

Distribution
Native distribution areas:

Continental: Asie
Java, peninsular Malaysia (widespread), Singapore, peninsular Thailand, Borneo

References: Brummitt, R.K. 2001. TDWG – World Geographical Scheme for Recording Plant Distributions, 2nd Edition
References

Hooker, J.D., 1882. Journal of the Linnean Society. Botany. London 19:293.

Links

Govaerts, R. et al. 2018. Dyera costulata in World Checklist of Selected Plant Families. The Board of Trustees of the Royal Botanic Gardens, Kew. Published online. Accessed: 2018 Oct. 15. Reference page.
Hassler, M. 2018. Dyera costulata. World Plants: Synonymic Checklists of the Vascular Plants of the World In: Roskovh, Y., Abucay, L., Orrell, T., Nicolson, D., Bailly, N., Kirk, P., Bourgoin, T., DeWalt, R.E., Decock, W., De Wever, A., Nieukerken, E. van, Zarucchi, J. & Penev, L., eds. 2018. Species 2000 & ITIS Catalogue of Life. Published online. Accessed: 2018 Oct. 15. Reference page.
International Plant Names Index. 2018. Dyera costulata. Published online. Accessed: Oct. 15 2018.
The Plant List 2013. Dyera costulata in The Plant List Version 1.1. Published online. Accessed: 2018 Oct. 15.
Tropicos.org 2018. Dyera costulata. Missouri Botanical Garden. Published online. Accessed: 15 Oct. 2018.
USDA, ARS, Germplasm Resources Information Network. Dyera costulata in the Germplasm Resources Information Network (GRIN), U.S. Department of Agriculture Agricultural Research Service. Accessed: 07-Oct-06.

Vernacular names
English: Jelutong

Dyera costulata, the jelutong, is a species of tree in the family Apocynaceae. It grows to approximately 60 metres (200 ft) tall with diameters of 2 metres (5 to 6 ft), or even to 80 m (260 ft) tall with diameters to 3 m (10 ft),[3] and boles clear and straight for 30 m (90 ft). It grows in Malaysia, Borneo, Sumatra and southern Thailand.[3] Its natural distribution is scattered locales in low-elevation tropical evergreen forest.

In addition, jelutong can be tapped for latex and from the 1920s through the 1960s, jelutong latex was an important source of chewing gum.

Jelutong has been traditionally overharvested, and is a threatened species in many areas. It is a protected species in parts of Malaysia and Thailand. The tree is grown commercially for timber.

Sawdust from this species has been known to cause allergic dermatitis.
Uses

Jelutong is used for its wood. Along with balsa it is technically a hardwood with many properties similar to that wood. These properties such as the low density, straight grain and fine texture mean it is easy to work with and hence popular with model makers and within the patternmaking trade. The roots are used as a cork substitute.
References

"Dyera costulata". International Plant Names Index (IPNI). Royal Botanic Gardens, Kew.
Hooker, J.D. (1882) Journal of the Linnean Society. Botany. London 19: 293

Middleton, David J. (September 2004). "Dyera costulata (Miq.) Hook.f.". In Soepadmo, E.; Saw, L. G.; Chung, R. C. K. (eds.). idiii. (free online from the publisher, lesser resolution scan PDF versions). Vol. 5. Forest Research Institute Malaysia. pp. 28–30. ISBN 983-2181-59-3. Archived from the original (PDF) on 27 September 2013. Retrieved 10 November 2008.