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A herb. It can lie along the ground or be a climber. It can grow 2-9 m high. It grows between 780-1,800 m above sea level. The leaves have leaflets that are more pale underneath. There are 3 leaflets 4-13 cm long. They usually have rusty hairs. The flowers are pea shaped and green to dull purple brown outside. They are pale violet inside. The flower heads have long stalks. The flowers are in pairs. The fruit are narrow pods. They are 2 cm long and flattened. There are 2 dark brown seeds
Leaflets discolorous, 3.5–13 × 3–15 cm, ovate to broadly ovate, usually 3-lobed, mucronate, margins repand, appressed pilose on both surfaces, more densely so on the undersurface, occasionally golden or ferruginous particuarly on the veins; petiole 6–24 cm long; rhachis 2–6 cm long; petiolules 2–6 mm long; stipules 5–7 mm long, narrowly ovate, striate.
Standard greenish with blue or purple flush outside, 1.5–2.5 × 0.8–1.5 cm, elliptic to broadly elliptic; wings and keel violet.
Pseudoracemes densely many-flowered; peduncles 5.5–25 cm long; pedicels 2–3 mm long; main bracts 15–22 × 2–4 mm, lanceolate.
Calyx pilose, tube 5 mm long; lobes 16–20 mm long, lanceolate, the tips drawn out into long filiform points.
Pods 2 × 0.6–1 cm, narrowly oblong, covered with short soft hairs and long stiff hairs, (1)2-seeded.
Stems slightly ridged, covered in ferruginous or golden hispid hairs.
Seeds dark brown, 5–6 × 4–5 × 2 mm, with a rough granular covering.
Trailing (often forming mats) or climbing robust perennial herb.
