Habit : Prostrate or twining perennial, herb or climber.

Stem : 0.15-3 m high; smooth or velvety.

Leaves : Trifolitae, with 3 rhombic, ovate, or nearly circular leaflets. The lateral leaflets are oblique. Leaflets are 1-6 cm long, 0.8-5 cm wide.

Flowers : Flowers are borne in loose racemes, 2-15 cm long, in leaf axils. Flowers are brownish outside, and yellow inside. The standard petal is often tinged reddish.

Fruits :Pods are oblong-curved, flattened, shortly beaked and slightly constricted between the widely spaced seeds, 0.6-3.5 cm long, 0.3-0.5 cm wide, black when ripe .

Seeds : Monocoloured, black or brown, 3 mm long, with a short hilus.