Adesmia is a genus of flowering plants in the legume family Fabaceae, placed within the informal monophyletic Adesmia clade of the tribe Dalbergieae. The genus was described by Augustin Pyrame de Candolle and published in 1825. It comprises approximately 225 accepted species (out of roughly 375 described), making it a sizable genus within the family. Species are herbaceous to shrubby perennials native to southern South America, distributed from Peru and southeastern Brazil southward through Argentina and Chile. The genus name derives from Greek words meaning "without a bundle," referencing the free (unfused) stamens characteristic of its flowers — an unusual trait among legumes. Members of Adesmia typically have pinnate leaves and papilionaceous flowers, often yellow, adapted to a range of habitats from Andean highlands to Patagonian steppe. The type species photographed for this entry, Adesmia salicornioides, was recorded in Parque Nacional Los Glaciares in Argentine Patagonia.
Etymology
The genus name Adesmia derives from the Greek words "a-" (without) and "desme" (bundle or package), referring to the free stamens — stamens that are not fused into the typical bundle found in most other legume genera. This is a distinctive morphological feature of the genus.
Distribution
Adesmia is endemic to southern South America. Its native range extends from Peru in the northwest and southeastern Brazil in the northeast, southward through Bolivia, Paraguay, Uruguay, Argentina, and Chile, reaching into Patagonia. The genus occupies diverse habitats across this range, from Andean slopes to lowland grasslands and semi-arid steppe.
Taxonomy
Adesmia was described by Swiss botanist Augustin Pyrame de Candolle in 1825 (Annales des Sciences Naturelles, Paris, 4: 94). It belongs to the family Fabaceae, order Fabales. Within the family, it has been recently assigned to the informal monophyletic Adesmia clade within the tribe Dalbergieae, based on molecular phylogenetic studies. The genus comprises approximately 225 accepted species out of roughly 375 that have been described. GBIF records 103 descendant taxa (species and infraspecific ranks), suggesting ongoing taxonomic revision.
