PlantaeDB Logo
Login Sign-up

Genus Pachygone in Family Menispermaceae

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!

Pachygone, a genus in the moonseed family (Menispermaceae), comprises roughly ten species of woody lianas and shrubs (POWO, 2024; WFO, 2024). Its range spans tropical West and Central Africa, extending eastward to Madagascar and nearby islands (Verdcourt, 1971). The type species is Pachygone ovata (Donn) Miers, first described as Cocculus ovatus and later transferred to the genus (Rohwer, 1993).

Morphologically, Pachygone shows the twining habit typical of Menispermaceae, producing long slender stems that climb surrounding vegetation. Leaves are alternate, simple, usually ovate to lanceolate, often glaucous beneath, sometimes pubescent; stipules are absent (Verdcourt, 1971). Inflorescences are axillary thyrses or narrow panicles bearing tiny unisexual flowers, each with three sepals, three petals, six stamens, a superior ovary with a single ovule, maturing into a fleshy drupe (Rohwer, 1993).

Species richness is highest in the Guineo‑Congolian region, where several endemics occupy lowland rainforest and forest‑edge habitats (POWO, 2024). A secondary centre lies in Madagascar, where Pachygone telfairii and Pachygone chapelieri are confined to island forest fragments (WFO, 2024). Most taxa occur from sea level to about 1 000 m on well‑drained soils along rivers (Verdcourt, 1971).

Floral visitors include small flies and bees that harvest the nectar, facilitating outcrossing (Rohwer, 1993). Drupes are dispersed by birds and mammals, allowing long‑distance seed movement. Pachygone reproduces vegetatively when aerial stems root at nodes, a common strategy among lianescent Menispermaceae. Chromosome numbers for the genus remain sparse, and a reliable base number has not been firmly established.

Current treatment recognizes Pachygone as a distinct genus (POWO, 2024; WFO, 2024). No formal subgeneric or sectional ranks are widely used, though informal groups based on leaf indumentum have been suggested (Rohwer, 1993). Some authors propose synonymising certain African species with Triclisia, yet major databases retain Pachygone as separate, citing morphological consistency and taxonomic evidence (Rohwer, 1993; Verdcourt, 1971).

The genus has limited commercial use. A few species are occasionally grown as ornamental climbers for their glossy foliage, but they are not widely commercialized. Wood use is modest and not significant for timber. Pachygone species are not listed as invasive outside their native ranges.

Several species are locally restricted and vulnerable to habitat loss from logging and agriculture (POWO, 2024). Further taxonomic clarification and field surveys are needed to evaluate population sizes and threats. Continued deforestation across its range makes the genus future uncertain, underscoring the need for conservation monitoring.

Pick a Species to see its components: