Le Testu's rainbow-scent (Iridosma letestui)

Silhouette: T. Michael Keesey / License

Iridosma letestui: An Endangered tree of Gabon

Growing exclusively in the moist tropical forests of Gabon, Iridosma letestui stands as a rare and endangered member of the Simaroubaceae family. This species plays an important ecological role in its native habitat, supporting local biodiversity and forest structure. It remains one of the most enigmatic trees of Central Africa due to its limited distribution.

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 Iridosma (Iridosma Bush)
  • ∟ species Iridosma letestui (Le Testu's rainbow-scent)

Living Pulse

Morphology

This species develops as a medium-sized forest tree with characteristic bitter wood, which is a common trait among Simaroubaceae representatives.

Its leaves are pinnately compound, arranged alternately along the branches, and feature entire leaflets. The flowers are small, grouped in paniculate inflorescences, and produce drupaceous fruits containing a single seed.

Interesting facts

  • Taxonomic History: It was originally described as Mannia letestui in the early 20th century before being placed in the monotypic genus Iridosma.
  • Strict Endemism: The species is restricted to southern Gabon, making it a priority for regional conservation efforts.
  • Bitter Compounds: Like many of its relatives, the wood contains bitter quassinoids that serve as a natural defense against herbivores.

Geography of distribution

  • Gabon

Technical Information

Taxon Synonyms: Mannia letestui

External Databases: GBIF, POWO, Tropicos

See also

True Araucarias

True Araucarias

Araucaria sect. Araucaria

Araucaria sect. Araucaria is a botanical section of evergreen conifers native to South America. It …