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), and boles clear and straight for 30 m (90 ft). It grows in Malaysia, Borneo, Sumatra and southern Thailand. Its natural distribution is scattered locales in low-elevation tropical evergreen forest.
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.
- "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). 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.
- Meding, B., A.T. Karlberg and M. Ahman. (1996). Wood dust from jelutong (Dyera costulata) causes contact allergy. Contact Dermatitis 34(5):349-53.
- Photos of latex harvest