Dysoxylum acutangulum

Dysoxylum acutangulum is an evergreen tree in the Meliaceae family. Membalo is one of its local names. Others include Langkang, Ambalo and Ambalun. Kew places its native range from peninsular Thailand into western Malesia. That range also includes Palawan in the Philippines. It grows in the wet tropics and forms part of the forest's upper canopy.

This is a large tree with a slow growth rate. Plants For A Future lists a height of 131 feet [40 metres]. It gives a spread of 98 feet [30 metres]. Forest accounts describe taller trees reaching 154 feet [47 metres]. The trunk grows straight and has grooves and large buttresses. It can lack branches for 59 feet [18 metres]. Its diameter can reach 4.6 feet [1.4 metres]. Buttresses may rise 10 feet [3 metres] above the ground. They can extend about 6.6 feet [2 metres] from the trunk.

In the wild, it grows in undisturbed lowland and hill forests. It occurs on sandy hillsides and ridges. Records extend to about 3,281 feet [1,000 metres] above sea level. Plants For A Future lists sandy and loamy soils as suitable. The soil should drain well but remain moist. Its listed pH range runs from mildly acid to mildly alkaline. The same source says it needs sun rather than shade. It lists USDA zones 10–12, placing it in warm-climate cultivation.

Its main recorded use is timber, rather than food or medicine. The sapwood has an orange-brown colour. The wood is hard and strong, with striking grain patterns. These markings occur in both the trunk and buttresses. The wood can be hard to work. Makers use it for furniture and Chinese coffins. Other uses include building work, flooring, boards and wall panels. It also supplies veneer, plywood and wooden pallets. Useful Tropical Plants reports heavy harvest from wild trees, mainly for furniture.

The seeds are poisonous and contain dysoxylum acid. Neither Plants For A Future nor Useful Tropical Plants records edible uses. Both also report no known medicinal uses. The supplied accounts give no species-specific flower or fruit description. They provide no details on leaf shape or bark colour. They also give no specific pest or disease records.