Hopea is a genus of approximately 114 species of tropical trees in the family Dipterocarpaceae (order Malvales), making it the second-largest genus in this family after Shorea. Members of the genus are found across a broad arc of tropical Asia, ranging from Sri Lanka and southern India through the Andaman Islands, Myanmar, and southern China, and extending southward throughout Malesia — the biogeographical region spanning the Malay Peninsula, the Indonesian archipelago, the Philippines, and New Guinea.
The trees are primarily subcanopy and main-canopy members of lowland tropical rainforest, though certain species, such as Hopea nutans, can grow as emergent trees projecting above the general canopy. Representative species can attain considerable stature: Hopea odorata, one of the best-known members, reaches heights of up to 45 m with trunk base diameters of up to 4.5 m. Some Hopea species rival the tallest tropical trees, with heights exceeding 80 m recorded within the genus.
As members of Dipterocarpaceae, Hopea trees are ecologically foundational in the lowland dipterocarp rainforests of Southeast Asia and Malesia, a forest type that has dominated the Borneo lowlands for millions of years. These forests are characterised by the dominance of dipterocarps, and Hopea species contribute to the structure and function of this biome across a wide elevation range, from sea level to roughly 1,300 m, in habitats that include riparian fringes, lowland dipterocarp forest, and coastal hills.
The wood of many Hopea species is commercially valuable and historically important in the regional timber trade; Hopea odorata timber is notably resistant to termites. The genus and its family have faced severe pressure from overcutting, illegal logging, and habitat conversion across their range, and several species are threatened in their natural habitats. In Borneo, nearly all dipterocarp species — including Hopea representatives — are now considered imperiled.
The genus name honours John Hope (1725–1786), the first Regius Keeper of the Royal Botanic Garden, Edinburgh, and a pioneering Scottish botanist.
Etymology
The genus Hopea was named in honour of John Hope (1725–1786), the first Regius Keeper of the Royal Botanic Garden, Edinburgh, and one of the most influential Scottish botanists of the eighteenth century.
Distribution
Hopea ranges from Sri Lanka and southern India through the Andaman Islands, Myanmar, and southern China, and extends southward throughout Malesia to New Guinea. The greatest diversity of the genus is concentrated in Borneo and the Malay Archipelago.
Ecology
Hopea species are primarily subcanopy and main-canopy trees of lowland tropical rainforest, growing from sea level to approximately 1,300 m in habitats including riparian fringes and lowland dipterocarp forest. They are keystone components of Southeast Asian lowland dipterocarp forest, a biome that has dominated Borneo and the wider Malesian region for millions of years.
Conservation
Many Hopea species are threatened in their natural habitats as a result of extensive logging, overcutting for timber, and large-scale habitat conversion to agriculture and plantations. In Borneo, where dipterocarp diversity is highest, nearly all species in the family — including numerous Hopea representatives — are considered imperiled. Climate modelling studies indicate that habitat loss compounded by climate change is projected to reduce suitable habitat for Dipterocarpaceae species significantly in coming decades.
Cultural Uses
Hopea timbers, particularly that of Hopea odorata, are valued for their durability and resistance to termites, and have been widely used in construction and the plywood trade across South and Southeast Asia. In Thailand, Hopea odorata — known locally as ta-khian — carries cultural and spiritual significance: trees are believed to be inhabited by a female tree spirit called Nang Ta-khian, a type of ghost (Nang Mai) associated with large forest trees.
