Trees. Stipules caducous. Leaves imparipinnate; stipels absent. Inflorescences axillary, racemose; bracts small, caducous. Calyx campanulate to calathiform, apex truncate. Corolla longer than sepals; standard orbicular, with 2 calluses on claw, basally auriculate; wings oblong, oblique, auriculate; keels falcate, apically adherent, apex truncate. Stamens 10, diadelphous; vexillary stamen free from other 9; anthers basifixed. Ovary subsessile, with 2 ovules; style inflexed, glabrous; stigma capitate. Seed 1 per legume.

One species: pantropical and extending into subtropics.

(Authors: Zhang Dianxiang (张奠湘); Les Pedley)