PlantaeDB Logo
Login Sign-up

Genus Haploclathra in Family Calophyllaceae

In botanical taxonomy, a genus (plural genera) is a rank used to group closely related species within a family. In the hierarchy, genus sits below family and above species.

Genera are defined by shared morphological, anatomical, and genetic characteristics (for example, features of flowers, fruits, seeds, or leaves) that indicate a close evolutionary relationship among the species they contain.

Each genus can include one or more species. Examples include Rosa (roses) and Solanum (nightshades, including tomato and eggplant).

Do you wish to read more about plant taxonomy? Click here!

Genus Description

Suggest a correction!

Haploclathra (Benth.) belongs to Calophyllaceae, a small genus of trees and treelets in the intimate group often treated within Clusiaceae sensu lato. Haploclathra paniculata (Benth.) Benth. serves as the type species (Bentham, 1849–1851). The genus comprises approximately five to six accepted species with additional names still in need of taxonomic resolution, and it occurs across northern South America from Venezuela to the Guianas, with a broader Amazonian footprint to Colombia, Ecuador, Peru, and Brazil. It inhabits lowland to lower montane rainforests, gallery forests, and seasonally inundated woodlands, typically below 800 meters elevation.

Morphologically, Haploclathra can be recognized by its buttressed, evergreen trees with opposite to subopposite, entire, pinnately veined leaves that are glabrous to lepidote-scurfy beneath and bear small, caducous intrapetiolar stipules. The inflorescences are paniculate or thyrsoid, often terminal or pseudo-terminal, and the flowers have distinct sepals and petals that are usually five, with numerous stamens and a superior to half-inferior ovary containing two or more ovules per locule. The fruit is a woody to somewhat fleshy capsule, and the seeds are winged.

Centers of diversity lie in the Guianas and the Amazon basin, including localized populations in the Serra do Imeri and other Brazilian shields; several taxa have narrow regional distributions. Taxonomic uncertainties persist, especially regarding distinctions from the closely related Caraipa and the number and delimitation of species across the Amazon–Guiana arc. The genus is supported within Calophyllaceae and Leoniinae in recent molecular phylogenetic studies of Clusiaceae s.l. and has been treated as part of Calophyllaceae since the early twenty-first-century APG realignments that recognized the family independently from Clusiaceae (APG III, 2009; APG IV, 2016).

Pollination and dispersal are not well documented, although the paniculate inflorescences and winged seeds suggest generalized pollination by insects and wind-assisted seed dispersal, a pattern common among related genera. Chromosome counts are not well established for the genus.

In human affairs, Haploclathra is not widely cultivated and remains of limited horticultural importance, though local or regional timber or wood uses may occur for some species. Several taxa are known from small, fragmented populations or areas under pressure, and habitat loss due to deforestation and mining constitutes the primary threat. Fieldwork is required to resolve species limits, refine the distribution map, and clarify conservation status.

Pick a Species to see its components: