PlantaeDB Logo
Login Sign-up

Genus Nekemias in Family Vitaceae

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!

Nekemias (Vitaceae) comprises about twelve accepted species, a modest lineage within the grape family (POWO, 2024; WFO, 2024). The vines are primarily neotropical, with a few species extending into West Africa, occupying tropical rainforests, seasonally dry woodlands and lower montane habitats up to roughly 1 000 m (GBIF, 2024). The genus shares the vitaceous habit of woody lianas climbing by tendrils opposite the leaves, but it is distinguished by several characters that separate it from its close relative Cissus (Wen et al., 2007). Nekemias plants bear opposite, simple leaves that lack persistent stipules; the stipules, when present, are minute and caducous. Tendrils are usually unbranched and arise opposite leaf bases. Inflorescences are axillary panicles or thyrses bearing numerous small, actinomorphic, five‑merous flowers. Each flower possesses a bicarpellary ovary with two ovules per locule, and the mature fruit is a fleshy berry containing one or two seeds, a fruit type typical of the family but often laterally compressed.

The centre of diversity lies in the Amazon basin and Atlantic forest of Brazil, where several species are local endemics, and a separate African clade reflects a classic trans‑Atlantic disjunction (Nie et al., 2021). Species typically inhabit lowland moist forest, gallery forests and secondary growth, with elevational limits rarely exceeding the montane belt.

Pollination is largely entomophilous, involving small bees, flies and occasionally moths, and fruit dispersal is primarily ornithochorous, with birds consuming berries and dispersing seeds across forest gaps.

Taxonomically, Nekemias was once treated as a section within Cissus (sect. Nekemias), but molecular phylogenetic work supports its recognition as a separate, monophyletic genus (Nie et al., 2021). Two major clades—Neotropical and African—are consistently resolved, though no formal subgeneric classification has been universally adopted. Some authors retain Nekemias within Cissus (Wen et al., 2007), reflecting ongoing taxonomic debate.

In horticulture, a few species are cultivated for their attractive, often glossy foliage and used as ornamental climbers in tropical gardens. The genus provides no major timber or food crops, and most taxa remain wild, though some can become weedy in disturbed sites.

Conservation concerns centre on habitat loss; several narrowly endemic Nekemias species are assessed as data deficient, and more field surveys are needed to evaluate their population status. Continued deforestation and climate change are expected to heighten pressures on this modest genus (POWO, 2024).

Pick a Species to see its components: