Calophyllum tomentosum

Calophyllum tomentosum, known in Sri Lanka by its Sinhala name Keena or Pona, is a large, evergreen timber tree native to the moist lowland and mid-elevation forests of South and Southeast Asia. In Sri Lanka it occupies a respected place in the Ayurvedic pharmacopoeia, where various parts of the plant — bark, resin, seed oil, and leaves — have been used for centuries to treat a range of conditions. It belongs to the family Calophyllaceae (formerly placed within Clusiaceae) and is closely related to the better-known Calophyllum inophyllum, the Indian laurelwood.

What does Calophyllum tomentosum look like?

The tree can reach heights of 25–35 metres in undisturbed forest, developing a straight, cylindrical bole valued by timber craftsmen. Its bark is grey to brownish and fissured, exuding a pale yellow or whitish latex when cut — a characteristic shared across the genus. Leaves are oblong-elliptic, leathery, and dark green on the upper surface, with fine parallel lateral veins running nearly perpendicular to the midrib, a reliable field identification feature. Small white flowers appear in axillary racemes, and the fruit is a globose drupe containing a single large seed.

The species epithet tomentosum refers to the fine, dense hair — tomentum — found on younger shoots and the undersides of leaves, distinguishing it from smooth-leaved relatives. In dense rainforest canopy, this characteristic can help botanists and trained naturalists tell it apart at close range.

Where does Calophyllum tomentosum grow in Sri Lanka?

The tree is found primarily in the wet zone of Sri Lanka, particularly in the lowland rainforests of the southwestern quarter of the island. It occurs naturally within and around protected forest areas, including the Sinharaja Forest Reserve, Sri Lanka's last viable tract of primary lowland tropical rainforest and a UNESCO World Heritage Site. It typically favours humid, well-drained soils at elevations from near sea level up to around 1,000 metres.

Outside protected areas, the tree has been planted in home gardens and smallholder plots, mainly for its timber and resin, though deforestation has reduced natural stands considerably over recent decades.

What are the Ayurvedic and medicinal uses of this tree?

Within the Sri Lankan Ayurvedic tradition, Calophyllum tomentosum is catalogued among the native medicinal plants used by traditional physicians (veda mahattayas). Different plant parts serve different therapeutic purposes:

• Bark and resin: The latex or resin tapped from incisions in the bark has been applied externally to treat skin conditions, wounds, and rheumatic pain. Its anti-inflammatory properties have attracted some interest in phytochemical research.
• Seed oil: Cold-pressed oil from the seeds contains a range of fatty acids and has been used topically in traditional formulations for joint pain and skin ailments, echoing uses documented for the related Calophyllum inophyllum across Asia.
• Leaves: Leaf preparations have occasionally been used in folk medicine for their purported astringent properties.

Contemporary phytochemical studies on the genus Calophyllum have identified compounds including xanthones, coumarins, and triterpenoids with demonstrated biological activity in laboratory settings. Clinical evidence for many traditional uses, however, remains limited, and preparations should be used under qualified Ayurvedic guidance. Practitioners seeking complementary plant references may also find the profiles of Pongamia pinnata and Acacia chundra relevant comparative reading.

What is the timber value of Calophyllum tomentosum?

The heartwood is reddish-brown to dark brown and moderately hard, making it suitable for general construction, furniture, and boat building — purposes for which Calophyllum species have historically been valued across coastal Asia. In Sri Lanka it has been used in traditional carpentry and is considered a serviceable, durable timber when properly seasoned. Because natural forest stands are now protected in most of the island's wet zone, legally sourced timber typically comes from cultivated trees or licensed plantations.

How does this species relate to other Calophyllum trees?

Sri Lanka hosts several species within the genus Calophyllum, and botanical identification in the field can be challenging without close examination of leaf venation, fruit morphology, and the degree of tomentum on young growth. Calophyllum inophyllum (Domba in Sinhala) is far more familiar to Sri Lankans as the large, spreading coastal tree common along beaches and temple grounds. Calophyllum tomentosum is a forest interior species and less frequently encountered by casual visitors. Both trees exude characteristic yellow latex, but their habitats, leaf texture, and overall form differ noticeably.

Is Calophyllum tomentosum cultivated or wild-collected in Sri Lanka?

The species occurs both as a wild forest tree and, to a lesser extent, as a cultivated specimen in home gardens and Ayurvedic herb gardens. Wild collection of bark, resin, and seeds from natural forest is practised by traditional medicine communities, though sustainable harvesting practices are important given the pressure on wet-zone forest habitats. Some Ayurvedic research institutions and botanical gardens in Sri Lanka maintain living specimens for study and propagation. There is growing interest in integrating such native medicinal species into agroforestry systems, combining timber and medicinal yield with ecological benefit.

What conservation status does this tree hold?

While Calophyllum tomentosum is not currently listed among the most critically threatened plant species in Sri Lanka, its dependence on wet-zone forest habitat means its long-term security is tied directly to the fate of those ecosystems. Continued habitat loss from agricultural expansion and informal logging puts pressure on naturally regenerating populations. Visitors to Sri Lanka's rainforest areas are encouraged to stay on marked trails and avoid harvesting any plant material — both to protect the ecosystem and to comply with forest conservation regulations.