Dipterocarpus retusus, commonly known as hollong, is a large tree and perhaps the best known species in the genus Dipterocarpus. It is native to China, Vietnam, Philippines, Laos, Cambodia, Malaysia, Indonesia, Myanmar, and India. The tree, some 20–30 metres (70–100 ft) tall, is found in Cambodia in dense forests of the plains, common on hillsides and along rivers and in forests between 800 m (2,600 ft) and 1,500 m (5,000 ft) altitude.
Dipterocarpus caudiferus is a species of tree in the family Dipterocarpaceae, endemic to Borneo. It grows as a large tree, up to 65 metres (200 ft) in height. Its habitat is mixed dipterocarp forests at altitudes up to 800 m (2,600 ft). Dipterocarpus caudiferus is threatened mainly by conversion of land for palm oil plantations.
Dipterocarpus coriaceus is a species of tree in the family Dipterocarpaceae endemic to Kalimantan, Sumatra and peninsular Malaysia. This very large tree occurs in mixed dipterocarp forests on hillsides and undulating land. This species was reported in the New Straits Times to be extinct in Peninsular Malaysia in July 2013 as its last natural habitat in Bikam Forest Reserve in Perak was de-gazetted and cleared for oil palm cultivation.
Dipterocarpus cornutus is a species of tree in the family Dipterocarpaceae native to peninsular Malaysia, Singapore, Sumatra and Kalimantan. Reaching heights of up to 50 meters tall, it is known for having large leaves. Its flowers are around 4 cm in diameter and of a pale yellow colouration. It drops seeds with green holes in the middle.
Dipterocarpus elongatus is a species of tree in the family Dipterocarpaceae found in Indonesia, Malaysia and Singapore. This large tree occurs in secondary and primary forest, as well as in freshwater swamp forest.
Dipterocarpus gracilis is a critically endangered species of tree in the family Dipterocarpaceae, native to South Asia and Southeast Asia.
Dipterocarpus grandiflorus is a species of flowering plant in the Dipterocarpaceae family. It is an endangered medium hardwood tree in South-East Asia and India. Its wood is used to produce good quality charcoal, paper pulp, and timber sold under the Keruing designation. Its gum is used locally as a waterproofing varnish. The tree itself is very useful for nitrogen fixing, erosion control, soil improvement, and watershed regulation.
Dipterocarpus lamellatus is a tropical rainforest tree endemic to Borneo. It is known from the Beaufort Hills, the Siangau Forest Reserve and Labuan in SW Sabah and Ladan Hills in the Tutong district of Brunei. It is one of the rarest and most endangered of all dipterocarps, with a population size of only twelve individuals, threatened mostly by habitat loss.
Dipterocarpus alatus, also known colloquially as the resin tree, is a tropical forest tree, of dense evergreen or mixed dense forests, in tropical Asia. It is considered vulnerable. It often occurs gregariously along river banks and is a key planting species for regenerating deforested land around the Dong Nai river and Cat Tien National Park.
Dipterocarpus obtusifolius is a common species of tree in the family Dipterocarpaceae found throughout Southeast Asia, including Andaman Islands, Myanmar, Thailand, Cambodia, Laos and Vietnam.
Dipterocarpus fagineus grows as a medium-sized tree up to 45 metres (150 ft) tall, with a trunk diameter of up to 1 metre (3 ft). Bark is greyish brown. The fruits are roundish to ellipsoid, up to 1 cm (0.4 in) long. The specific epithet fagineus is from the Latin meaning "like a beech". Habitat is mixed dipterocarp forest on hills. D. fagineus is found in Sumatra, Peninsular Malaysia and Borneo.
Dipterocarpus kunstleri grows as a canopy tree up to 40 metres (130 ft) tall, with a trunk diameter of up to 1 metre. Bark is orange-brown. Fruit is ellipsoid, up to 5 centimetres (2.0 in) long. Habitat is mixed dipterocarp forest from sea-level to 400 metres (1,300 ft) altitude. D. kunstleri is found in Sumatra, Peninsular Malaysia, Borneo and the Philippines.
Dipterocarpus lowii is a tree in the family Dipterocarpaceae.
Dipterocarpus oblongifolius grows as a tree up to 30 metres (100 ft) tall, with a trunk diameter of up to 1.5 metres. Bark is greyish brown. The fruits are ovoid to spindle-shaped, up to 3 cm (1 in) long. The specific epithet oblongifolius is from the Latin meaning "oblong leaves". Habitat is river banks from sea-level to 400 metres (1,300 ft) altitude. D. oblongifolius is found in Thailand, Peninsular Malaysia and Borneo.
Dipterocarpus rigidus grows as a large tree up to 50 metres (160 ft) tall, with a trunk diameter of up to 1 metre. Bark is rust-brown. The fruits are roundish, up to 5 cm (2 in) in diameter. Habitat is mixed dipterocarp forest on low hills near coasts. D. rigidus is found in Sumatra, Peninsular Malaysia and Borneo.
Dipterocarpus stellatus is a tree in the family Dipterocarpaceae. The specific epithet stellatus means "star-like", referring to its trichomes.
Dipterocarpus sublamellatus grows as a large tree up to 70 metres (230 ft) tall, with a trunk diameter of up to 3 metres (10 ft). Bark is orange-brown. The fruits are round, up to 3 cm (1 in) in diameter. It is found in a variety of now vulnerable habitats from sea-level to 400 metres (1,300 ft) altitude. D. sublamellatus is native to Sumatra, Peninsular Malaysia and Borneo.
Dipterocarpus hispidus is a species of tree in the family Dipterocarpaceae, endemic to Sri Lanka.
Dipterocarpus bourdilloni is a species of large tree in the family Dipterocarpaceae endemic to the Western Ghats principally in the state of Kerala in India.
Lipaso Forest Reserve is a protected forest reserve in Telupid District of Sandakan Division, Sabah, Malaysia. It was designated as a Class 1 Protection Forest by the Sabah Forestry Department in 1984. Its area is 3,606 hectares (36.06 km2). The reserve is mountainous with some palm oil plantations and farms in the surroundings. The forest is mostly mixed dipterocarp. Threats to the reserve forests include fires and encroachment for agriculture.
