Pterospermum suberifolium is a deciduous tree native to South and Southeast Asia, including Sri Lanka, where it holds a recognised place in the country's catalogue of ayurvedic medicinal plants. Known for its distinctive large leaves — corky and rough on the underside — and fragrant night-blooming flowers, the tree is valued as much for its therapeutic properties as for its ecological role in tropical dry forests and mixed woodland habitats.
What is Pterospermum suberifolium?
Pterospermum suberifolium belongs to the family Malvaceae (formerly placed in Sterculiaceae) and is one of several Pterospermum species documented across South Asia. The genus name derives from the Greek for "winged seed," a reference to the elongated, papery wings that help the seeds disperse on the wind. In Sri Lanka the tree grows in lowland and mid-elevation forests, where it can reach a height of around fifteen metres under suitable conditions.
The leaves are notably asymmetric, deeply lobed on younger growth, and covered on their lower surface with a dense, cork-like layer of stellate hairs — a feature that gives the species its epithet suberifolium, meaning "cork-leaved." Flowers are large, creamy white, and strongly scented, opening after dusk and pollinated primarily by moths.
What are the traditional ayurvedic uses of this plant?
Within Sri Lanka's ayurvedic tradition, different parts of the Pterospermum suberifolium tree — bark, leaves, flowers, and roots — are cited in classical texts and practitioner knowledge for a range of applications. The bark is commonly referenced as an astringent and is used in preparations addressing inflammatory conditions of the skin and mucous membranes. Decoctions incorporating the bark have traditionally been applied to wounds and ulcers.
The flowers, harvested fresh or dried, appear in some formulations targeting respiratory complaints and fevers. Leaf preparations have been used topically to ease joint pain and swelling. As with many species in Sri Lanka's ayurvedic pharmacopoeia — which also includes well-documented plants such as Acacia chundra and Pongamia pinnata — the plant is typically used as part of a compound formulation rather than in isolation.
It is important to note that while these traditional uses are documented, they should not be interpreted as clinical medical advice. Any therapeutic use should be supervised by a qualified ayurvedic practitioner.
Where does Pterospermum suberifolium grow in Sri Lanka?
The tree is found across several of Sri Lanka's dry and intermediate zones, growing in natural forests, along roadsides, and occasionally in home gardens where it is cultivated for shade and medicinal access. The dry lowland forests of the North Central Province and parts of the Northwestern Province provide typical habitat, though the species tolerates a range of soil types.
Visitors travelling through Sri Lanka's natural landscapes — including the forests surrounding Wilpattu National Park — may encounter Pterospermum suberifolium as part of the broader dry-forest canopy, often identifiable by its large, pale-backed leaves and the papery seed capsules that persist on branches after flowering.
How does this plant fit into Sri Lanka's broader herbal heritage?
Sri Lanka's ayurvedic tradition is one of the oldest and most continuously practised in the world, drawing on both locally endemic flora and species shared with the Indian subcontinent. The government formally recognises hundreds of medicinal plant species, and Pterospermum suberifolium is catalogued within this official framework, which helps preserve both botanical knowledge and sustainable harvesting practices.
The island's rainforests and dry-zone forests together harbour an extraordinary density of medicinal species. The Sinharaja Forest Reserve, a UNESCO World Heritage Site, is particularly noted for its concentration of endemic flora with documented ethnobotanical significance, illustrating how tightly Sri Lanka's ecological and healing traditions are interwoven.
Interest in Sri Lanka's plant-based medicine has grown alongside broader global attention to traditional and integrative health systems. Researchers continue to investigate the phytochemical profiles of species like Pterospermum suberifolium, with studies exploring compounds present in the bark and leaf extracts that may help explain the anti-inflammatory and antimicrobial properties long attributed to the tree in classical texts.
Is Pterospermum suberifolium related to other plants in the Lakpura catalogue?
Lakpura documents a range of Sri Lanka's medicinal and aromatic plants as part of an effort to share the island's botanical heritage with interested travellers and researchers. Pterospermum suberifolium sits alongside other catalogued species — including Syzygium aromaticum (clove) and Yogaraja Guggulu, a classical polyherbal formulation — reflecting the depth and diversity of the island's ayurvedic tradition.
Together, these entries offer a window into a living system of plant knowledge that has shaped Sri Lankan food, medicine, and ritual practice for centuries. For travellers with a particular interest in herbal medicine or ethnobotany, Sri Lanka provides rare access to both the plants themselves and to practitioners who continue to work with them in formal and community healthcare settings.
Conservation and sustainable use
Like many medicinal trees, Pterospermum suberifolium faces pressure from habitat clearance and over-harvesting in some areas. Sri Lanka's Department of Ayurveda and the Forest Department together oversee frameworks for sustainable collection of wild plant material, and several species are now cultivated in dedicated medicinal plant gardens attached to ayurvedic hospitals and research institutes.
Responsible use of the species — favouring cultivated sources over wild harvest and ensuring that collection does not deplete local populations — is encouraged by practitioners and conservationists alike. Travellers who visit ayurvedic centres during a Sri Lanka trip may have the opportunity to see Pterospermum suberifolium growing alongside other medicinal trees in curated gardens, providing a more direct connection to the plant than a textbook description can offer.
