A woody vine. It grows 30 m long. The stems are cylinder shaped and smooth. They can be 10 cm across at the base. The leaves are alternate and have 3 leaflets. They usually hang down. The leaflets are 7-14 cm long by 5-7 cm wide. The upper surface is dark green and the lower surface is light green. The end leaflet is narrowly oval with a rounded base and the side leaflets are unequal. The upper surface is dark green and shiny and the lower surface is light green. The flowering shoots hang down and the flowers have rusty hairs. The flowers are are blue to violet or red. The pod is woody and flattened. It is 12-23 cm long by 5-6 cm wide. They is a long point at the tip. There are ribs across the pod and stinging hairs. The seeds are 3.5 cm across. They are brown with a black hilum.
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