Intsia bijuga
Also known as: Ipil (Philippines) · Merbau (Malaysia, Indonesia) · Kwila (Papua New Guinea, Pacific) · Borneo teak, Johnstone River teak (trade labels)
Definition
Intsia bijuga, called ipil in the Philippines and merbau in much of Southeast Asia and the Pacific, is a large tree of the pea family (Fabaceae) yielding one of the region’s most durable construction timbers. Occurring from East Africa through Southeast Asia to the western Pacific, it grows in the Philippines including Palawan and other island forests, commonly near coasts and rivers. Its dark red-brown wood is so resistant to decay and termites that it has been used for structures expected to last generations, and the species is regarded as threatened by overharvesting across its range.
Identities
| Database | Identifier |
|---|---|
| Wikipedia | Intsia bijuga |
| Wikidata | Q12700996 |
| DBpedia | Intsia_bijuga |
Also Known As
- Ipil (Philippines)
- Merbau (Malaysia, Indonesia)
- Kwila (Papua New Guinea, Pacific)
- Borneo teak, Johnstone River teak (trade labels)
Examples and Analogies
Ipil is the tropical counterpart of teak: dense, oily, and weatherproof, suited to the same uses in flooring, joinery, and boatbuilding. Its interlocked grain and golden flecks, caused by deposits in the wood vessels, give cut boards an appearance often compared to brushed bronze, and its durability in ground contact resembles that of naturally treated timber.
Usage Scenarios
The timber is milled for flooring, heavy construction, bridges, wharf decking, boat planking, tool handles, and furniture. In the Pacific, ipil is a traditional canoe and house-post wood, while modern markets prize it as an alternative to endangered rainforest hardwoods in engineered flooring. Planted specimens serve as shade trees, and the tree fixes nitrogen, benefiting degraded sites.
Strategies
Sustainable-use strategies include plantation establishment on degraded coastal land, enrichment planting in logged-over forests, and retention of seed trees. Range states regulate harvest, and certification bodies track merbau supply chains, which have historically been plagued by illegal logging, particularly in Indonesia and Papua New Guinea. Philippine programs treat remaining ipil stands as protected residual timber within forest management units.
Security and Safety Measures
Trade controls are the species’ principal safeguard, since merbau has been a flagship case of illegal timber trafficking in Southeast Asia; import regulations such as legality-verification schemes screen shipments. Harvester communities mitigate risks by mapping stands and monitoring coupe boundaries. Woodworkers face standard hardwood dust hazards, and the wood’s natural deposits can stain skin and tools.
Historical Context
Ipil has been used across island Southeast Asia and the Pacific for centuries in canoe and house construction, valued by coastal peoples for its strength in saltwater exposure. It entered global trade as merbau during the twentieth century, becoming a leading export timber of Indonesia, Malaysia, and Papua New Guinea, which drew down old-growth stocks and prompted conservation attention. In the Philippines, exploitation preceded its listing among regulated timber species.
Challenges and Controversies
Illegal logging and timber smuggling have made merbau one of the most notoriously trafficked tropical hardwoods, with smuggling routes through border seas repeatedly exposed. Taxonomic confusion with the closely related Intsia palembanica complicates regulation. Conservationists criticize continued demand for merbau flooring in consumer countries, and reforestation with the species is slow because of its long rotation time.
Related Topic
Philippine Forestry Products