Dyera costulata (syn. D. laxiflora), the jelutong, is a species of tree in the oleander subfamily. It grows to approximately 60 metres (200 ft) tall with diameters of 2 metres (5 to 6 ft), or even to 80 m (260 ft) tall with diameters to 3 m (10 ft), and boles clear and straight for 30 m (90 ft). It grows in Malaysia, Borneo, Sumatra and southern Thailand. Its natural distribution is scattered locales in low-elevation tropical evergreen forest. In addition, jelutong can be tapped for latex and from the 1920s through the 1960s, jelutong latex was an important source of chewing gum.