Mature leaflets discolorous, 4.8–14.5 × 2.8–4.5 cm, narrowly ovate to narrowly elliptic, occasionally lobed on one side, appressed pilose on upper side, more densely appressed pilose on the underside; petiole (0.5)1.5–6 cm long; rhachis 1.5–2 cm long; petiolules 2–4 mm long.
Calyx 5–10(12) mm long, pilose with silvery hairs, the underlying surface blackening on drying, 5-lobed, the upper two lobes almost completely fused, all lobes tipped with (1)2 pedicellate glands 1–3 mm long or glands sometimes absent.
Inflorescence a pseudoraceme or panicle, with 1–several flowers in each fascicle, the fascicles often more crowded towards the apex of the inflorescence; pedicels 3–5 mm long.
Herb with trailing or climbing stems, from a woody rootstock.
Pods 1.5–2.5 cm long, densely pilose, 1–2-seeded.
Corolla 1–1.8 cm long.
Seeds 3–4 × 2 × 1 mm.
Branches hirsute.