The stems are long and crawl sideways and are 1 m long. There are many soft hairs standing on the whole. The leaves are alternate and three leaves. The apical leaflets are wide-fallen to fallen-oval, or elliptical to almost circular, with a length of 1 to 2 cm, a width of 8 to 15 mm, and the tip is often slightly recessed. The flowers appear on the leaf buds, have almost no pattern, and attach 2-4 pieces together. The flowers are 7 to 8 mm long, the petals are white, and there is a pair of reddish purple spots near the central base of the flag valve. One to three closed flowers arrive at the top of the stem. The heel is 3 to 4 mm long and has many standing hairs, and the fissure is 2.5 to 3 mm long and needle-like. The nodules are broad egg-shaped with dense hair lying on the tip, and the length is 3 to 4 mm. Closed flowers have better fruiting.