Meso-Papilionoideae

Meso-Papilionoideae or 50-kb Inversion clade is a monophyletic clade of the flowering plant subfamily Faboideae that includes the majority of papilionoid legumes. It contains many agronomically important genera, including Arachis, Cicer, Glycine, Medicago, Phaseolus, Trifolium, Vicia, and Vigna.
This clade is circumscribed by the presence of a 50 kb inverted DNA sequence in the plastome of member species and is consistently resolved in molecular phylogenies.
The name Meso-Papilionoideae was proposed for this clade by Wojciechowski. Its original name, 50-kb Inversion clade is still in use and the clade is still frequently referred to by this name in publications, as well as the Angiosperm Phylogeny Website and NCBI taxonomy browser.

Description

This clade circumscribes six subordinate clades: one traditional tribe and five informal clades, as well as the genus Amphimas. The clade has the following ICPN-compliant, node-based definition:

The most inclusive crown clade exhibiting the structural rearrangement in the plastid genome homologous with that found in Aldina latifolia Spruce ex Benth. 1870, Holocalyx balansae Micheli 1883, Maackia amurensis Rupr. 1856, Wisteria floribunda DC. 1825, and Glycine max Merr. 1917, where these taxa are extant species included in the crown clade defined by this name.