|Etymology||Genus||After Sir William Turner Thiselton-Dyer, an English botanist|
|Species||Full of small ribs; likely referring to the branching|
|Synonyms||Alstonia costulata Miq.|
|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.
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.