PlantaeDB Logo
Login Sign-up

Genus Deguelia in Subfamily Papilionoideae

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!

Deguelia, a genus of woody lianas and shrubs in the legume family Fabaceae, subfamily Papilionoideae, comprises approximately fifty species predominantly in the Neotropics (POWO, 2024; WFO, 2024). Its core range is the Amazon basin and Guiana Shield, extending into Central America and the Andes foothills, where it occupies lowland to montane forests and riverine corridors. The type species is Deguelia scandens (Aubl.) A.C.Sm., widely cited across treatments (Smith, 1936; Lewis et al., 2005).

The genus is diagnosed by unifoliate to trifoliolate leaves with entire margins and caducous stipules, bearing axillary or terminal panicles with papilionaceous flowers. Corollas are typically pink to purple with standard and keel petals bearing a nectariferous callosity; stamens are diadelphous with anthers bearing small terminal appendages, a feature uniting Deguelia with the broader “Deguelia clade” of Millettieae. Ovaries are unilocular with two collateral ovules; fruits vary from laterally winged samara-like legumes (samaroid pods) to more broadly flattened legumes; seeds are non-endospermic.

Diversity concentrates in lowland tropical forests, with several narrowly endemic taxa in northern South America and northern Brazil. Elevational distributions extend into lower montane zones in the Andes and tepui regions of the Guianas (Lewis et al., 2005).

Pollination and dispersal strategies remain poorly documented for most species; available records suggest typical bee visitation but lack focused studies (BFG, 2015). Chromosome counts are sparse, but the widely accepted base number for Millettieae is x=11 (Goldblatt & Johnson, 2003). A few studies document 2n=22, consistent with this number (Lewis et al., 2005).

Deguelia has a complex taxonomic history, long treated as Derris sensu lato in the New World; modern revisions revived Deguelia for American taxa based on morphological and molecular evidence (Smith, 1936; Kottmann et al., 2021). Floristic treatments recognize three sections—Sect. Deguelia, Sect. Pseudoderris, and Sect. Platypterocarpus—but sectional assignments remain provisional and species limits are fluid (Mackinder & Pennington, 2011). Alternative treatments persist: some floristic databases continue to treat Derris as the accepted name for New World taxa (GBIF, 2024). These conflicts reflect transitional work following the transfer from Derris to Deguelia, with ongoing adjustments as phylogenies integrate richer sampling (WFO, 2024).

Several Deguelia species are cultivated as ornamentals for their showy panicles and flexible stems, but economic importance remains limited (Lewis et al., 2005). No species are major crops or timber sources; some lianas can be weedy in disturbed gaps but are not widely recognized as invasive.

Threats reflect deforestation and habitat fragmentation across the Amazon and Guianas; however, many taxa remain insufficiently sampled and Red List assessments lag behind taxonomic progress (BFG, 2015). Integrated conservation planning coupled with updated phylogenies and standardized nomenclature will be essential for long-term stewardship (Kottmann et al., 2021).

Pick a Species to see its components: