Dodonaea viscosa is a hardy evergreen shrub or small tree belonging to the family Sapindaceae. Known locally as Wal kurundu in Sinhala and Velakkurunda in Tamil, it is one of Sri Lanka's most ecologically useful native plants, found across a wide range of habitats from coastal dunes to dry-zone forests. Its resilience in poor soils and drought conditions makes it an important species for conservation, traditional medicine, and sustainable land management.
What does Dodonaea viscosa look like and where does it grow?
Dodonaea viscosa is a fast-growing plant that typically reaches heights of up to four metres, though it can remain compact when exposed to wind or poor soil. Its leaves are narrow, slightly sticky to the touch, and a glossy mid-green — the stickiness giving rise to its common English name, hopbush. The plant produces small, inconspicuous flowers followed by distinctive papery, winged seed capsules that turn red or purple before drying to brown.
In Sri Lanka, the species is particularly widespread in the dry zone and intermediate zone — appearing in open scrubland, along roadsides, on coastal margins, and in degraded agricultural land. It tolerates poor, rocky, or sandy soils and survives extended dry periods with little intervention, qualities that set it apart from more demanding native species.
The plant is also found naturally in similar arid landscapes across Asia, Africa, and Australia, making it one of the more globally distributed shrubs in the tropics. In Sri Lanka, however, its cultural and medicinal role is especially deep-rooted, shaped by centuries of Ayurvedic practice and rural knowledge.
Why is Dodonaea viscosa important for Sri Lanka's ecology?
Few plants contribute as broadly to Sri Lanka's dry-zone ecosystems as Dodonaea viscosa. Its dense, fibrous root system binds loose topsoil, making it a valuable tool in erosion control — particularly on hillslopes and coastal fringes exposed to seasonal rains and wind. Along the coastal belt, it helps stabilise sand dunes, acting as a natural barrier that supports the health of ecosystems behind the dune line.
Dodonaea viscosa also plays a role in ecological restoration. In areas where native forest cover has been removed or degraded, this species often establishes itself early and creates the microclimate conditions needed for slower-growing trees to follow. This successional function is well recognised by conservation practitioners working in Sri Lanka's dry zone.
- Prevents soil erosion on slopes and sandy coastal areas
- Stabilises sand dunes along the coastal belt
- Provides early canopy cover in degraded or cleared land
- Supports insect pollinators through its small flowers
- Offers habitat and food sources for birds and invertebrates
- Disperses wind-borne seeds widely, ensuring natural regeneration
The species' capacity to thrive in the dry zone — including areas near protected landscapes like Wilpattu National Park — makes it a quiet but significant contributor to the broader ecological network of northern and north-western Sri Lanka.
What are the traditional medicinal uses of Dodonaea viscosa in Sri Lanka?
Dodonaea viscosa has been used in Sri Lankan traditional medicine for generations. Ayurvedic practitioners and rural healers draw on different parts of the plant — leaves, bark, and roots — each carrying distinct therapeutic applications. The leaves are the most commonly used portion, known for their anti-inflammatory and antimicrobial properties.
The leaves contain flavonoids and other bioactive compounds that have attracted growing scientific interest. In practice, they have traditionally been applied to wounds and skin conditions, used in poultices to reduce localised inflammation, and prepared as decoctions to manage fever. The bark has also been used in remedies targeting joint pain and rheumatic conditions.
| Plant Part | Traditional Application | Reported Properties |
|---|---|---|
| Leaves | Wound healing, fever reduction, skin conditions | Anti-inflammatory, antimicrobial |
| Bark | Joint pain, rheumatic complaints | Analgesic, anti-inflammatory |
| Roots | Internal fever management | Antipyretic |
These applications align with broader Ayurvedic traditions found across South Asia, where Dodonaea viscosa appears in classical formulations alongside other botanicals. Related compounds used in traditional Sri Lankan medicine — such as Pongamia pinnata — reflect the island's deep pharmacopeial heritage and its continued relevance in rural health practices.
How is Dodonaea viscosa used beyond medicine?
The practical applications of Dodonaea viscosa extend well beyond traditional healing. The wood is notably hard and durable relative to the plant's modest size, and has historically been fashioned into tool handles, small agricultural implements, and charcoal in rural communities. While it is not a significant commercial timber species, its wood remains a useful local resource in areas where larger timber is scarce.
The leaves have been used in traditional dyeing processes, imparting colour to fabric and yarn. This use is less common today but persists in craft communities maintaining older textile traditions. The plant is also grown as a windbreak and living hedge in home gardens and agricultural holdings across the dry zone, valued for its speed of establishment and tolerance of pruning.
In landscaping, Dodonaea viscosa is occasionally selected as an ornamental hedge, particularly because its winged seed pods display an attractive reddish tint before drying. Its tolerance of salt spray makes it a sensible choice for coastal gardens where many species struggle.
Is Dodonaea viscosa used in reforestation programmes in Sri Lanka?
Yes, and increasingly so. Conservation agencies and community forestry programmes in Sri Lanka have recognised Dodonaea viscosa as a pioneer species well-suited to reforestation in degraded dry-zone areas. Because it establishes readily from seed and grows quickly in nutrient-poor soil, it is used to initiate canopy cover and improve soil conditions before slower-growing, longer-lived species are introduced.
Its role in soil conservation is particularly relevant in the dry zone's red-brown earth and reddish-yellow latosol soils, which are prone to crusting and erosion during the northeast monsoon. By stabilising the ground surface and adding organic matter through leaf litter, Dodonaea viscosa prepares the ground for richer ecological communities over time.
Community-led conservation efforts near Acacia chundra scrubland zones often incorporate Dodonaea viscosa as part of a broader dry-zone species mix, acknowledging its complementary role in multi-species restoration planting.
Where can travellers observe Dodonaea viscosa in Sri Lanka?
Travellers with an interest in Sri Lanka's native flora are most likely to encounter Dodonaea viscosa in the dry zone and along the coast. The species appears naturally along roadsides and open scrubland throughout the North Central, Northern, and North Western Provinces. It is also present in disturbed ground at the margins of protected areas.
Those visiting Sinharaja Forest Reserve or other forested areas may find Dodonaea viscosa in the transitional scrub at forest edges. Its winged seed pods are the most reliable identification feature: flat, papery, and often tinged pink or red when fresh, they cluster at branch tips and catch the eye at close range. The best time to see the seeds in colour is typically during the drier months, when the plant redirects energy from growth to reproduction.