Dyera costulata (Miq.) Hook. f.

Etymology Genus After Sir William Turner Thiselton-Dyer, an English botanist
Species Full of small ribs; likely referring to the branching
Family Apocynaceae
Synonyms Alstonia costulata Miq.
Common Names Jelutong
Status Native: Common
Form Tree
Native Distribution Indochina, Borneo, and Indonesia


Dyera costulata can be easily identified from its branching where they curve upwards from a point. This might not be apparent for a mature tree it is still possible to observe this trait from their secondary branchings using a pair of binoculars.

Interesting Facts:

Jelutong is a commonly cultivated tree also found natively in our forests. Corner (1997) spoke of the largest specimen ever recorded in Malaya (Senaling Inas Forest Reserve) which has a height and girth of about 60m and 6.5m respectively.

A huge mature Jelutong in the Central Catchment Nature Reserve.

A younger form in Singapore Botanic Gardens.

Leaves are spirally arranged.

Diagnostic upward curved branching from a single point.

Young flush of leaves.



Corner EJH. (1997) Wayside Trees of Malaya. Volume 1. 4th edition. The Malaysian Nature Society, Kuala Lumpur. 476 pp.

Author: Jake
Posted: 2014-05-25 / Modified: 2017-12-25