PlantaeDB Logo
Login Sign-up

Genus Averrhoa in Family Oxalidaceae

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!

Averrhoa L. is a small, primarily cultivated genus in the family Oxalidaceae, traditionally associated with two widely used species—Averrhoa carambola and A. bilimbi—while several poorly known taxa (A. dolichocarpa, A. leucodermis, A. micrantha) are treated variably by recent checklists, giving a total of about four to six species (POWO, 2024; WFO, 2024). Its native distribution centers in Malesia, but both main species are long‑cultivated and extensively naturalized across the humid tropics of Southeast Asia, the Pacific, the Caribbean, and South America, where they occur in lowland gardens, secondary forests, and disturbed sites at low elevations. The type species of Averrhoa is A. bilimbi L. (WFO, 2024).

The genus is recognized by small, treelet habit with soft, alternative, imparipinnate leaves that have several pairs of elliptic to ovate leaflets and no stipules. Flowers are pink to lilac, 5‑merous, with reflexed petals and ten stamens in two whorls, the outer whorl bearing filaments, the inner often reduced or absent; they are borne in fascicles or short cymes on older wood and on trunk cauliflory. The ovary is superior with five carpels and axile placentation; fruit is a fleshy, ellipsoid to ridged berry with a firm wall and numerous seeds, which are arillate and dispersed by birds and mammals following human cultivation (Herklots, 1974; APG IV, 2016).

Species diversity concentrates in Malesian rain forest margins, with endemics (A. leucodermis, A. micrantha) restricted to small island systems; cultivated taxa have become pantropical weeds in suitable climates. Pollination is generalist insect‑mediated; many cultivars set fruit by selfing, and fruits are dispersed by birds and mammals. Chromosome counts for A. carambola are 2n=24, consistent with x=12 across Oxalidaceae (Mitra, 1965).

Taxonomically, the genus is stable within Oxalidaceae as circumscribed by APG IV (2016). Recent treatments recognize two to four species, sometimes sinking A. dolichocarpa into synonymy of A. carambola or recognizing additional taxa as varieties; authoritative checklists (POWO, 2024; WFO, 2024) list four entities but flag some names as uncertain, reflecting unresolved taxonomy in wild populations. Human relevance is primarily horticultural: both species are widely cultivated for fruit and ornamentals; A. carambola is a significant minor fruit crop, and escaped plants can become naturalized in disturbed habitats. Conservation concerns focus on genetic erosion of landraces and incomplete documentation of rarer taxa; a forward-looking need is to clarify species limits and protect remaining wild progenitors to guide future breeding and resilience.

Pick a Species to see its components: