Scientific name: Dipterocarpus costulatus
Family name: Dipterocarpaceae
Keruing Kipas trees in Taman Tugu
The Keruing Kipas is an indigenous rainforest tree which is amongst the 4,100 trees added to the Taman Tugu site. This tree was selected in collaboration with Forest Research Institute of Malaysia (“FRIM”) and Malaysian Nature Society (“MNS”). The tree is a source of Keruing timber and is commonly harvested from the wild for local use and also for trade. The tree is currently classified as ‘Critically Endangered’ in the International Union for Conservation of Nature (“IUCN”) Red List of Threatened Species.
The Keruing Kipas is a typical Dipterocarpus species that can grow up to 30m in height. The trunk is grey and has large lenticels. Leaves are about 16 × 12cm, wavy at the edges and ridged at between the veins. The leaves are leathery, glabrous and usually wedge shaped at the base. Stipules go to about 16 cm long, softly hairy and pinkish. The fruits, about 1.5 cm across, have prominent stalk and rather sharp warts on the calyx tube. Two long wings about 20 × 4cm.
Its heartwood is light red to red brown or purplish red brown; it is clearly demarcated from the 5-7cm wide band of sapwood. The texture is coarse with the grain straight or interlocked. 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. It seasons slowly, with a high risk of checking and distortion; once dry it is poorly stable to moderately stable in service.
It has a high blunting effect on tools due to the presence of silica, stellite-tipped and tungsten carbide tools are recommended; some species are very resinous and can clog tools; there is occasional tearing on quartersawn wood; nailing and screwing are good, but require pre-boring; gluing is correct, but care is required because of the resin
A general construction timber, it is used in carpentry, panelling, joinery, floors, timber frame houses, boxes and crates, veneer etc.
These trees are found in Southeast Asian lowland forests on poor soils on flat and undulating land, rarely ascending to 600m. These trees are native to Malaysia, Singapore, and Indonesia.