Plant: Perennial vine with trailing or weakly twining stems Leaves: leaves pinnately trifoliate; leaflets seldom less than twice as long as wide, linear or narrowly elliptic to ovate-lanceolate, rounded to acutish at apex, the veins often prominent beneath Flowers: flowers small, in axillary few-flowered racemes or fascicles; corolla yellow, the keel more or less falcate; pods flat, pubescent, slightly lunate asymmetric, completely dehiscent; seeds 1 or 2.