Inflorescences terminal or axillary, falsely racemose or paniculate, the flowers paired or fasciculate on the rhachis; bracts narrow; bracteoles absent or minute and soon deciduous.
Fruit narrowly linear-oblong, much flattened, the sutures often sinuate between the seeds, not articulate but splitting into 2 thin reticulate valves.
Corolla small, purple or white, glabrous; standard rounded or obovate, narrowed into a claw; wings free from the keel, auriculate.
Leaves pinnately 3-foliolate (abnormally subpalmately 5-foliolate); stipules free, lanceolate, striate; stipels present.
Ovary sessile or stipitate, many-ovuled; style filiform, recurved at the apex, glabrous; stigma terminal, capitate.
Calyx 5-lobed; lobes subequal, the upper pair almost entirely joined to form a lip.
Seeds subreniform, compressed, almost without an aril; funicle elongated.
Vexillary stamen entirely free in fully opened flowers; anthers uniform.
Erect perennial herbs or subshrubs.