Borneo Quassia (Quassia borneensis)

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Quassia borneensis: Botanical Guide, Habitat & Properties

Native to the tropical rainforests of Sumatra and Borneo, Quassia borneensis occupies a specific niche in the understory of Malesian forests.

This woody species belongs to the bitterwood family, Simaroubaceae, and was first formally described by the Dutch botanist Hans Peter Nooteboom in 1963.

Taxonomy

  • ∟ царство Plantae
  • ∟ division Tracheophytes
  • ∟ subdivision Spermatophytes (Seed plants)
  • ∟ Angiosperms
  • ∟ mesangiosperms
  • ∟ eudicots
  • ∟ Superrosids
  • ∟ rosids
  • ∟ malvids
  • ∟ order Sapindales
  • ∟ family Simaroubaceae (Quassia family)
  • ∟ genus Quassia (Quassia Wood)
  • ∟ species Quassia borneensis (Borneo Quassia)

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Morphology

Quassia borneensis is characterized by its woody growth habit, typical of the Simaroubaceae family. The plant features alternate, pinnately compound leaves or sometimes simplified leaves, which are dark green and leathery in texture.

The flowers are small, regular, and arranged in terminal or axillary inflorescences. The wood and bark contain bitter quassinoids characteristic of the genus, which serve as a natural defense mechanism against herbivores.

Applications

Like other members of the Simaroubaceae family, the wood of Quassia borneensis contains bitter quassinoids. These active compounds are traditionally utilized in localized ethnomedicine for their potential antiparasitic and febrifuge properties.

Additionally, extracts from the bitter wood have been explored as natural insecticides and pest deterrents in forestry and agriculture.

Interesting facts

The specific epithet borneensis directly refers to Borneo, one of the primary islands where this plant was first collected and documented.

The bitter compounds found in the tissues of this plant are among the most bitter natural substances known to science, providing excellent protection against chewing insects.

Geography of distribution

  • Indonesia
  • Malaysia

Sources

  • POWO (2026): Plants of the World Online. Facilitated by the Royal Botanic Gardens, Kew.
  • WFO (2026): World Flora Online.
  • IPNI (2026): International Plant Names Index.

Technical Information

External Databases: GBIF, POWO, Tropicos

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