Common Name:

General Information

Dipterocarpus hasseltii is a tree growing up to 45 metres tall. The straight, cylindrical bole can be 126cm in diameter[].
The tree is a commercial source of keruing timber and is commonly harvested from the wild for local use and also for trade.
The plant is threatened by habitat loss and has been classified as 'Critically Endangered' in the IUCN Red List of Threatened Species(2011)[].

Known Hazards

None known

Botanical References

Range

Southeast Asia - Vietnam, Thailand, Malaysia, Indonesia, Philippines.

Habitat

An upper canopy tree of mainly coastal undisturbed mixed dipterocarp forests at elevations up to 100 metres, where it is usually found on ridges. In secondary forests it is usually present as a pre-disturbance remnant tree[].

Properties

Conservation Status	Critically Endangered
Other Uses Rating
Habit	Tree
Height	40.00 m
Cultivation Status	Wild

Cultivation Details

A tree of the moist, lowland tropics, where it can be found at elevations up to 100 metres[].
Young trees grow best in the shade of the forest, but become increasingly light-demanding as they grow larger[].
Members of this genus generally only regenerate naturally in the shade of the forest. Seedlings and saplings can persist in dense forest shade for many years. In their first 2 years the young plants cannot tolerate major openings in the canopy, but after they are well established (about 120cm tall) the canopy can be opened up around them to speed up their growth[].

Edible Uses

None known

Medicinal

None known

Other Uses

Although we have seen no specific information for this species, all members of this genus contain an oleo-resin in the trunk - though it is not always freely produced and is also not always of good quality[]. The oil is obtained by cutting a hole in the trunk near the base (about 90 - 150cm from the ground) and then dipping out the resin with a spoon as it collects there. To prolong the flow, a fire made from dead leaves or brushwood is made in the hole at intervals - this burns off the dried resinous film and allows the resin to flow again[, ].

The tree is a source of keruing timber[, , ]. We do not have specific information for this plant, but a general description of the wood is as follows:-
The heartwood varies from light to dark red-brown or brown to dark brown, sometimes with a purple tint; it is usually well defined from the 5 - 7cm wide band of gray or buff sapwood. The texture is moderately coarse; grain straight or shallowly interlocked; lustre low; there is a strong resinous odour when freshly cut, it is without taste. The wood is moderately heavy to heavy; moderately hard; somewhat durable, being resistant to dry wood borers, fairly resistant to fungi but susceptible to termites, though silica content may be high, resistance to marine borers is erratic. It seasons slowly, with a high risk of checking and distortion; once dry it is poorly stable to moderately stable in service. Silica content is variable, generally less than 0.5%. The wood generally saws and machines well, particularly when green; blunting of cutters can be moderate to severe due to silica content, stellite-tipped and tungsten carbide tools are recommended; it is sometimes difficult to glue; resin adhering to machinery and tools may be troublesome and can also interfere with finishes; nailing and screwing are good, but require pre-boring; gluing is correct, but care is required because of the resin. The wood is used for general construction work, carpentry, panelling, joinery, framework for boats, flooring, pallets, chemical processing equipment, veneer and plywood, suggested for railroad crossties if treated[, , ].

Propagation

Seed -

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