Intermediate Quassia (Quassia intermedia)

Silhouette: T. Michael Keesey / License

Quassia intermedia: Rare Shrub of Hispaniola

Found natively on the Caribbean island of Hispaniola, Quassia intermedia occupies specialized ecological niches in tropical dry forests. This woody plant contributes to the architectural complexity of the understory vegetation.

Botanists study this species to understand the biogeographical distribution of the genus in the Greater Antilles. Its adaptation to rocky terrains makes it a resilient member of island plant communities.

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 intermedia (Intermediate Quassia)

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Morphology

The species displays distinct vegetative features that align with its Caribbean relatives. Its adaptive structures are optimized for dry forest conditions.

  • Foliage: The compound leaves are alternate and consist of coriaceous, oblong-elliptic leaflets with smooth margins.
  • Flowers: Small flowers form in branched panicles at the ends of branches, showing pale yellow or green shades.
  • Stems: The young branches have a greyish-brown bark that contains bitter compounds.
  • Fruits: Oval, fleshy drupes contain a single seed and turn dark when ripe.

Applications

Due to its rarity, the economic uses of this plant are limited, but its botanical properties remain valuable. It has potential applications in scientific research and conservation biology.

  • Phytochemical Research: The plant serves as a source for studying unique bitter quassinoids and their potential bioactivity.
  • Habitat Restoration: Planting this species in degraded dry forests helps restore natural understory layers.
  • Soil Conservation: Its root system helps bind sandy and rocky soils on sloping island terrains.

Interesting facts

Several interesting details highlight the evolutionary significance of this island plant. Its restricted range makes it a species of interest for Caribbean biogeography.

  • Taxonomic Name: The specific epithet intermedia refers to its intermediate morphological traits between related species in the region.
  • Island Endemism: It is strictly endemic to Hispaniola, growing naturally only in the Dominican Republic and Haiti.
  • Chemical Defense: The plant produces high concentrations of bitter agents to prevent grazing by native herbivores.

Geography of distribution

  • Dominican Republic
  • Haiti

Sources

  • Plants of the World Online (POWO)
  • World Flora Online (WFO)
  • Global Biodiversity Information Facility (GBIF)

Technical Information

External Databases: GBIF, POWO, Tropicos

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