|from Koehler's Medicinal-Plants (1887)|
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.
Hollong (Dipterocarpus macrocarpus) is the State Tree of Assam, India. Hollong is a medium hardwood, timber tree. It grows naturally in forests of upper Assam and Arunachal Pradesh. Hollong is a sacred tree for Moran community of Assam. Today Hollong is used in plywood industries.
It is famed for its timber and resin. In Cambodia, the resin is collected by people in the mountainous regions, in order to make torches and candles, while the wood is used in construction to make columns and boards.
- Ly, V.; Nanthavong, K.; Pooma, R.; Luu, H.T.; Nguyen, H.N.; Vu, V.D.; Hoang, V.S.; Khou, E.; Newman, M.F. (2017). "Dipterocarpus retusus". The IUCN Red List of Threatened Species. 2017: e.T32400A2817693. doi:10.2305/IUCN.UK.2017-3.RLTS.T32400A2817693.en. Retrieved 18 April 2019.
- "Dipterocarpus retusus". Plants of the World Online. Royal Botanic Gardens, Kew. Retrieved 18 April 2019.
- "Dipterocarpus retusus". Germplasm Resources Information Network (GRIN). Agricultural Research Service (ARS), United States Department of Agriculture (USDA). Retrieved 18 April 2019.
- DY PHON, Pauline, 2000, Plants Used In Cambodia, printed by Imprimerie Olympic, Phnom Penh
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