White Siris (Ailanthus triphysa)

Ferntop Ash Halmaddi White Bean Thanh thất Cây bút Hoëm thôm

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Ailanthus triphysa: The Ferntop Ash and Halmaddi Resin Tree

Thriving across the tropical rainforests of Asia and Australia, this tall evergreen tree plays a vital role in both local ecosystems and traditional industries. It is widely recognized for its high-quality timber and aromatic secretions, which have been harvested for generations.

Commonly known as the ferntop ash or halmaddi, it occupies a significant place in South Asian cultural practices. However, over-exploitation of its natural populations has led to strict forestry regulations to protect the species from decline.

Taxonomy

∟ царство Plantae
∟ division Tracheophytes (Vascular Plants)
∟ subdivision Spermatophytes (Seed plants)
∟ Angiosperms
∟ mesangiosperms (Core angiosperms)
∟ eudicots
∟ core eudicots
∟ Superrosids
∟ rosids
∟ malvids
∟ order Sapindales
∟ family Simaroubaceae (Quassia family)
∟ genus Ailanthus (Tree of heaven)
∟ species Ailanthus triphysa (White Siris)

Morphology

Growing to heights of 30 to 35 meters, this tree features a straight, cylindrical trunk that can reach up to 1.2 meters in diameter. Its grey bark is characteristically rough, resembling sandpaper to the touch. The inner bark or blaze displays a distinctive yellow color speckled with red dots.

The foliage and reproductive structures exhibit several key botanical features:

Foliage: Curved, sickle-shaped pinnate leaves are arranged along stems that are at least 1 centimeter in diameter. The falcate leaflets are highly asymmetrical at the base, measuring 5 to 12 centimeters in length.
Inflorescences: Branched axillary panicles range from 10 to 20 centimeters long, bearing small, greenish-yellow polygamous flowers.
Fruit: The dry fruit is a papery, green to greenish-brown samara measuring 5 to 6 centimeters, often developing in clusters of three.

Close inspection of the leaflet blades reveals numerous closely spaced oil dots visible under magnification. The prominent venation forms distinct loops well within the blade margin, with the midrib raised in a small depression on the upper leaf surface.

Flowering season

Flowering occurs from November to January in Australia, and from December to May in India.

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Name

Dec

Applications

The lightweight, soft wood of this species is highly valued for commercial manufacturing, particularly for producing plywood, matchwood, and high-quality charcoal. It is easily workable, making it a preferred material for light construction in its native regions.

Beyond its timber, the tree is highly valued for its chemical and medicinal properties:

Incense Production: A sticky resin harvested from the bark, known locally as halmaddi, serves as a crucial fixative in traditional incense sticks, including Nag Champa.
Traditional Medicine: In Cambodia and India, decoctions of the bark are used to treat dysentery and intestinal edema. The wood also contains alkaloids and quassinoids utilized in remedies for dyspepsia and bronchitis.

Interesting facts

Harvesting of the aromatic resin historically caused high mortality rates among wild trees due to destructive extraction methods. This ecological damage prompted the Indian Forest Department to ban resin harvesting in the 1990s, causing the global price of traditional incense ingredients to skyrocket.

The resin has a unique physical property where it remains in a flexible, semi-solid state by naturally absorbing moisture directly from the surrounding air.

Geography of distribution

India
Sri Lanka
Myanmar
China
Thailand
Laos
Malaysia
Cambodia
Vietnam
Philippines
Indonesia
Australia

Sources

Plants of the World Online (POWO)
World Flora Online (WFO)
Flora of China

Technical Information

Taxon Synonyms: Ailanthus philippinensis, Ailanthus kurzii, Hebonga mollis, Ailanthus imberbiflora, Adenanthera triphysa, Ailanthus imberbiflora var. macartneyi, Hebonga siamensis, Ailanthus malabarica, Ailanthus fauveliana, Ailanthus imberbiflora var. imberbiflora, Hebonga obliqua