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: Vulnerable | |
| Form | Tree | |
| Native Distribution | Indochina, Borneo, and Indonesia | |
Diagnostics:
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.
Fruits.
References
Corner EJH. (1997) Wayside Trees of Malaya. Volume 1. 4th edition. The Malaysian Nature Society, Kuala Lumpur. 476 pp.Author: Siyang
Posted: 2014-05-25 / Modified: 2025-10-27
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