It is widely distributed from south Myanmar and Thailand through the
Malay archipelago to Papua New Guinea but it has not been recorded
Features: Tall tree to 33m with a trunk up to 70cm in diameter.
Bark brown to grey with yellowish brown lenticels from top to base,
sometimes smooth. Short buttress and knee roots.
Leaves oval, shiny green (9-16cm long). Flowers larger than B.
cylindrica (about 2cm) in clusters of 2-3 flowers. Calyx is pale
green with 10 stout long lobes. Petals are pale turning orangey
brown, hairy with 2-4 bristles at the tips.
Propagule develops on the parent plant: the hypocotyl is
cigar-shaped (1-9cm long), slightly thickened towards the end,
slightly curved. The calyx lobes are extended at right angles to the
According to Tomlinson, the small flowers are pollinated by day
flying insects such as butterflies. The petals of the flower hold
loose pollen and are under tension. When probed at the base, the
petal unzips to scatter a cloud of pollen over the head of the
Status and threats: This plant is listed as 'Critically
Endangered' on the Red List of threatened plants of Singapore, as
well as globally on the IUCN Red List.