Leaflets possess vesicular glands below, which are membranaceous or rather tick. Stipellae are present or absent. Flowers are present in axillary or terminal pedunculate or almost sessile racemes. They are yellow, or lined with red, or flag is dorsally reddish, and upto 3 cm long. Coralla are persistent or not, vexillum obovate-orbicular, reflexed, clawed, auriculate.
Wings are obliquely obovate auriculate, keel rounded-oblique, obtuse.
Ovary is subsessile with 3 to 10 ovoules. Style is thickened above the middle, upcurved, upper part glabrous or slightly hairy, not bearded. Its fruit is a pod, linear-oblong, apex obtuse or acute, compressed, bivalved, depressed between the seeds with transverse lines, more or less septate between the seeds. Its seeds are reniform to suborbicular, shiny, white, brown, grey, purple or black, variegated or not, strophiole conspicuous or vestigial. It has deep, strong, woody tap root with well developed lateral roots in the superficial layers of the soil.