Anogeissus latifolius, commonly known as axlewood or dhawa, is a deciduous tree native to the dry and mixed deciduous forests of South and Southeast Asia, including Sri Lanka. It holds a recognised place in the island's catalogue of Ayurvedic medicinal plants, valued by traditional healers for its wide-ranging therapeutic applications. Though not as widely discussed as other botanicals in popular travel writing, the tree is a quiet cornerstone of Sri Lanka's forest ecology and its centuries-old healing traditions.
What is Anogeissus latifolius and where does it grow in Sri Lanka?
Anogeissus latifolius belongs to the family Combretaceae. It is a medium to large tree that can reach heights of around 20 metres under favourable conditions, with a spreading canopy and distinctive grey-brown bark that peels in thin flakes. The leaves are elliptical and alternate, turning coppery-yellow before falling in the dry season.
In Sri Lanka, the species favours the dry and intermediate zones, where it grows in association with other dry-forest trees in areas such as the North Central and North Western provinces. It can be encountered within and around protected landscapes like Wilpattu National Park, where dry scrub forest gives way to denser woodland. The tree often grows on rocky ridges and shallow soils where many other species struggle to establish.
What are the traditional medicinal uses of Anogeissus latifolius?
Sri Lankan Ayurvedic practice draws on nearly every part of this tree. The bark is perhaps the most widely used component: a decoction prepared from it is traditionally employed to manage diarrhoea, dysentery, and intestinal disorders. The bark's high tannin content — one of the most concentrated among Indian subcontinent timber trees — gives it pronounced astringent properties that underpin these applications.
The gum produced by the tree, sometimes called ghatti gum or Indian gum, has long been used as a binding agent in traditional formulations. It is considered a useful emulsifier and has historically served as a substitute for gum arabic in compound preparations. Leaf extracts and stem bark are also explored in traditional practice for their potential antimicrobial and antioxidant activity, though clinical research in these areas remains ongoing.
- Bark decoction: used for gastrointestinal complaints, including diarrhoea and dysentery
- Ghatti gum: a natural emulsifier used in compound Ayurvedic formulations
- Leaf preparations: applied topically in some traditions for skin conditions
- Stem bark: explored for antimicrobial properties in traditional wound care
Related medicinal species in Sri Lanka's Ayurvedic canon include Acacia chundra and Pongamia pinnata, both of which share dry-zone habitats and overlap in some traditional applications involving bark and resin.
What is the ecological importance of Anogeissus latifolius in Sri Lanka's dry forests?
Anogeissus latifolius is considered an important structural species in dry deciduous forest communities. Its hard, dense timber has historically been used for agricultural implements, charcoal, and construction, which has placed pressure on wild populations in some parts of South Asia. In Sri Lanka, dry-zone forests face ongoing challenges from agricultural encroachment and climate variability, making the conservation of species like this one particularly relevant.
The tree provides canopy shade and organic matter through leaf litter, supporting soil health in ecosystems that experience several months of drought each year. Wildlife including deer and smaller mammals browse its foliage, and it serves as a host for various insects that in turn support the food webs of dry-zone protected areas. Visiting the ancient city of Polonnaruwa, surrounded by precisely this kind of dry-zone forest, offers a sense of the landscape in which this species has grown for millennia.
How is Anogeissus latifolius identified in the field?
Distinguishing Anogeissus latifolius from other dry-zone trees requires attention to a handful of consistent features. The bark is a reliable first marker: pale grey, smooth on young stems but developing a characteristic flaky, scaly texture on mature trunks. The small, clustered flowers are yellowish-green and appear in spherical heads — a distinctive inflorescence that gives the tree one of its common names, the button tree.
- Bark: grey, flaking in irregular scales on mature specimens
- Leaves: alternate, elliptic to ovate, with a slightly wavy margin
- Flowers: tiny, greenish-yellow, arranged in compact globose heads
- Fruit: small, winged nutlets that cluster into a dense spherical head
- Habit: deciduous; the canopy thins significantly in the dry months
What is the role of plants like Anogeissus latifolius in Sri Lankan Ayurveda?
Sri Lankan Ayurveda, which draws from both the classical Indian tradition and a distinctly local body of knowledge developed over more than two thousand years, relies on a broad pharmacopoeia of native plants. Trees like Anogeissus latifolius represent the intersection of ecology and medicine — species that persist in the landscape precisely because generations of healers recognised their value and, in many cases, cultivated or protected them near villages and temple grounds.
The formal catalogue of Sri Lankan Ayurvedic medicinal plants maintained by national authorities runs to hundreds of species, spanning coastal mangroves, highland cloud forests, and the dry lowland jungles where axlewood thrives. Understanding individual species within this catalogue requires situating them within the broader ecological and cultural context of the island — something that remains an active area of both academic research and traditional practice. The Sinharaja Forest Reserve, a UNESCO World Heritage Site, illustrates how dramatically different Sri Lanka's wet-zone forest pharmacopoeia is from the dry-zone traditions that produced knowledge of plants like Anogeissus latifolius.
Is Anogeissus latifolius used outside Ayurveda?
Beyond Ayurvedic practice, ghatti gum extracted from this species has attracted commercial interest in food technology and pharmaceutics as a natural stabiliser and emulsifier. It is approved as a food additive in several countries and has been used in the preparation of confectionery, beverages, and oil-in-water emulsions. Research into its applications in controlled drug delivery — exploiting its mucoadhesive and film-forming properties — has grown steadily over recent decades.
The timber, though not among Sri Lanka's primary commercial hardwoods today, has traditional uses in cart wheels, agricultural tools, and as a high-quality charcoal source due to its density and heat value. In some forest communities, the gum is still tapped seasonally as a supplementary livelihood activity, in a manner loosely comparable to kitul tapping in the wet zone.
