Pointed-leaved calunga (Simaba cuspidata)

Silhouette: T. Michael Keesey / License

Simaba cuspidata: Botanical Characteristics & Habitat

Found primarily in the humid ecosystems of northern Brazil, Simaba cuspidata showcases the botanical diversity of the Amazonian basin. This species grows in the moist understory, preferring areas with high relative humidity and regular rainfall. It forms a key component of the dense forest floor community.

The specific epithet highlights the distinctive tip of its leaflets, which helps botanists distinguish it from closely related taxa. Collected historically during major Amazonian expeditions, it remains a valuable specimen in herbarium collections. Its ecological associations involve various specialized insect pollinators.

Taxonomy

  • царство Plantae
  • division Tracheophytes
  • subdivision Spermatophytes (Seed plants)
  • Angiosperms
  • mesangiosperms
  • eudicots
  • Superrosids
  • rosids
  • malvids
  • order Sapindales
  • family Simaroubaceae (Quassia family)
  • genus Simaba (Simaba Tree)
  • species Simaba cuspidata (Pointed-leaved calunga)

Morphology

This woody plant typically develops as a large shrub or small tree. The leaves are pinnately compound, with leaflets that terminate in a sharp, elongated point known as a cuspidate tip. This adaptation helps shed excess water from the leaf surface during heavy rains.

The diagnostic features of its reproductive structures include:

  • Inflorescence: Loose, paniculate structures that project slightly beyond the foliage.
  • Flowers: Small, actinomorphic blossoms featuring five pale petals and a prominent disk.
  • Fruits: Smooth, green drupes that turn yellowish-brown as they ripen on the branches.

Applications

While not widely cultivated, Simaba cuspidata plays a role in maintaining the integrity of pristine forest soils. The roots form mycorrhizal associations that assist in nutrient cycling in poor rainforest soils. Local forest communities sometimes use the bitter wood for minor construction projects.

Interesting facts

The cuspidate leaf tip acts as a natural drip tip, a common feature in tropical rainforest plants that prevents the growth of epiphyllous algae and mosses. Like other species of the genus, its tissues are rich in defensive secondary metabolites that deter grazing insects.

Geography of distribution

  • Amazonas
  • Pará

Natural varieties

Sources

  • POWO: Plants of the World Online (Royal Botanic Gardens, Kew)
  • GBIF: Global Biodiversity Information Facility database
  • WFO: World Flora Online consortium
  • Tropicos: Botanical database of the Missouri Botanical Garden

Technical Information

External Databases: GBIF, POWO, Tropicos