The

tribe The term tribe is used in many different contexts to refer to a category of human social group. The predominant worldwide usage of the term in English language, English is in the discipline of anthropology. This definition is contested, in p ...

Swartzieae is an early-branching

monophyletic In cladistics for a group of organisms, monophyly is the condition of being a clade—that is, a group of taxa composed only of a common ancestor (or more precisely an ancestral population) and all of its lineal descendants. Monophyletic gro ...

clade A clade (), also known as a monophyletic group or natural group, is a group of organisms that are monophyletic – that is, composed of a common ancestor and all its lineal descendants – on a phylogenetic tree. Rather than the English term, ...

of the

flowering plant Flowering plants are plants that bear flowers and fruits, and form the clade Angiospermae (), commonly called angiosperms. The term "angiosperm" is derived from the Greek words ('container, vessel') and ('seed'), and refers to those plants th ...

subfamily

Faboideae The Faboideae are a subfamily of the flowering plant family Fabaceae or Leguminosae. An acceptable alternative name for the subfamily is Papilionoideae, or Papilionaceae when this group of plants is treated as a family. This subfamily is wide ...

or Papilionaceae. Traditionally this tribe has been used as a

wastebasket taxon Wastebasket taxon (also called a wastebin taxon, dustbin taxon or catch-all taxon) is a term used by some taxonomists to refer to a taxon that has the sole purpose of classifying organisms that do not fit anywhere else. They are typically defined ...

to accommodate genera of

which exhibit

actinomorphic Floral symmetry describes whether, and how, a flower, in particular its perianth, can be divided into two or more identical or mirror-image parts. Uncommonly, flowers may have no axis of symmetry at all, typically because their parts are spirall ...

, rather than

zygomorphic Floral symmetry describes whether, and how, a flower, in particular its perianth, can be divided into two or more identical or mirror-image parts. Uncommonly, flowers may have no axis of symmetry at all, typically because their parts are spirall ...

floral symmetry and/or incompletely differentiated petals and free stamens. It was recently revised and most of its genera were redistributed to other tribes (

Amburaneae The tribe Amburaneae is one of the subdivisions of the plant family Fabaceae. It has been circumscribed to include the following genera, which used to be placed in tribes Sophoreae and Swartzieae: * '' Amburana'' Schwacke & Taub. * '' Cordyla'' ...

Baphieae The tribe Baphieae is one of the subdivisions of the plant family Fabaceae. The Baphieae tribe arose 55.3 ± 0.4 million years ago (in the early Eocene). Genera The Baphieae tribe has been circumscribed to include the following genera, w ...

, and

Exostyleae The tribe Exostyleae is an early-branching monophyletic clade of the flowering plant subfamily Faboideae (or Papilionaceae) that are mostly found in Neotropical rainforests. Description This clade is composed of 6 genera, most of which were tr ...

). Under its new circumscription, this clade is consistently resolved in

molecular phylogenies Molecular phylogenetics () is the branch of phylogeny that analyzes genetic, hereditary molecular differences, predominantly in DNA sequences, to gain information on an organism's evolutionary relationships. From these analyses, it is possible to ...

. Members of this tribe possess "non-papilionate swartzioid flowers ��argely characterized by a tendency to lack petals combined with a profusion and elaboration of free stamens" and a "lack of unidirectional order in the initiation of the stamens". They also have "complete or near complete fusion of sepals resulting from intercalary growth early in development, relatively numerous stamens, and a single or no petal, with other petals not at all apparent in development." The tribe is predicted to have diverged from the other legume lineages 48.9±2.8 million years ago (in the

Eocene The Eocene ( ) Epoch is a geological epoch (geology), epoch that lasted from about 56 to 33.9 million years ago (mya). It is the second epoch of the Paleogene Period (geology), Period in the modern Cenozoic Era (geology), Era. The name ''Eocene' ...

Subclades and genera

Swartzioids ''sensu stricto'' Ireland ''et al''. 2000

The members of this clade occur mainly in lowland rain forests. * '' Bobgunnia'' J. H. Kirkbr. & Wiersema * ''

Bocoa ''Bocoa'' is a genus of flowering plants in the legume family, Fabaceae (Leguminosae). It belongs to the subfamily Faboideae (Papilionoideae). Several species in the genus were recently reclassified as '' Trischidium''. The genus is largely l ...

'' Aubl. * '' Candolleodendron'' R. S. Cowan * '' Fairchildia'' Britton & Rose * ''

Swartzia ''Swartzia'' is a genus of flowering plants in the family Fabaceae. It was named in honor of Swedish botanist Olof Swartz and contains about 200 species. ''Swartzia'' is restricted in its geographical distribution to the New World Tropics, wher ...

'' Schreb.

Atelioids Ireland ''et al''. 2000

The members of this clade are distinguished by "a nearly actinomorphic androecium with basifixed anthers, exarillate seeds, and a tendency toward alternate leaflets." They occur mainly in neotropical, seasonally-dry tropical woodlands. * ''

Ateleia ''Ateleia'' is a genus of legume in the family Fabaceae. It contains the following species: * '' Ateleia albolutescens'' Mohlenbr. * '' Ateleia apetala'' Griseb. * '' Ateleia arsenii'' Standl. * '' Ateleia glazioveana'' Baill. * '' Ateleia gu ...

'' (DC.) Benth. * '' Cyathostegia'' (Benth.) Schery * ''

Trischidium ''Trischidium'' is a genus of flowering plants in the legume family, Fabaceae. It belongs to the subfamily Faboideae. It was recently reinstated after existing for some time as a junior synonym of ''Bocoa ''Bocoa'' is a genus of flowering p ...

'' Tul.

References

{{Taxonbar, from=Q7653958 Faboideae Fabaceae tribes