PlantaeDB Logo
Login Sign-up

Genus Plukenetia in Family Euphorbiaceae

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!

Plukenetia (L.) is a genus of the spurge family Euphorbiaceae containing about 30 accepted species (POWO, 2024). Its members are pantropical woody lianas and shrubs, most common in the lowland rainforests of West‑Central Africa and the Andean foothills of Peru and Ecuador. The type species is Plukenetia volubilis L., the source of the cultivated sacha inchi.

Diagnostic characters include alternate, simple leaves with small stipules and variable indumentum, sometimes glandular. Inflorescences are axillary or terminal thyrses of unisexual flowers; male flowers have many stamens fused at the base, female flowers a 2–4‑locular ovary with axile placentation and short, often bifid styles. The fruit is a dehiscent capsule bearing winged or arillate seeds.

Species richness peaks in West and Central Africa, where several taxa are endemic to the Congo Basin and Guinean forests; a secondary center occurs in the northern Andes of Colombia, Ecuador and Peru. Most species inhabit rainforest to 1,500 m, few reach montane edges. The genus shows a Gondwanan pattern, African lineages sister to Neotropical clades (WFO, 2024).

Flowers are visited mainly by unspecialized insects, including bees and flies, facilitating outcrossing. Seed morphology varies: winged seeds of the P. volubilis group are wind‑dispersed, whereas fleshy arils attract birds and mammals. Cytological data reveal a consistent base chromosome number x = 9 across sampled taxa (Rödl, 1998).

The genus is placed in tribe Euphorbieae of Euphorbiaceae (APG IV, 2016). Phylogenetic work resolves an African clade and a Neotropical clade (Stevenson et al., 2020). Historically two subgenera—subgenus Plukenetia and subgenus Hyalosepalum—have been proposed, but recent data question the stability of these ranks (WFO, 2024). Several species formerly treated as Plukenetia have been transferred to other genera, reflecting ongoing circumscription changes.

Several species are cultivated for edible oil seeds; P. volubilis is grown commercially in the Andes for its high‑value oil and as an ornamental vine. P. conophora yields a lightweight timber used locally in West Africa. No Plukenetia species are recorded as major weeds or invasive threats.

Habitat loss from deforestation, mining and agricultural expansion threatens several African endemics, which lack detailed population assessments. Conservation status is poorly known; many taxa remain Data Deficient. Targeted field surveys and genetic studies are needed to inform management, while continued taxonomic clarification will refine conservation priorities.

Pick a Species to see its components: