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An erect or climbing herb. It can grow 1.8 m tall. The leaves usually appear after the flowers. The leaves are 4-12 cm long by 4-10 cm wide. They have 3 lobes. The flower clusters are in the axils of leaves or at the end of the plant. There can be 1 or several flowers in the group. The standard is purple, the wings are violet and the keel is white. The fruit is a pod 2-3 cm long. It has spreading hairs. There are 1 or 2 seeds. The seeds are 5-7 mm long by 4-6 mm wide and 2 mm thick.
Leaves usually appearing after the flowers; mature leaflets discolorous, 4–12 × 3.7–10 cm, essentially ovate, moderately to markedly 3-lobed, occasionally lobed on one side, appressed pilose on both surfaces; petiole 2.5–10 cm long; rhachis 1.5–2.5 cm long; petiolules 2–3 mm long.
Calyx 8–20 mm long, covered with spreading silky hairs, each lower lobe tipped by a pedicellate gland, each upper lobe tipped with (1)2–3 pedicellate glands, the pedicels of the glands (3)4–7 mm long.
Inflorescences axillary or terminal, the flowers in fascicles of 1–several flowers, the fascicles becoming more crowded towards the apex of the inflorescence; pedicels 1–7 mm long.
Pod 1.8–3 cm long, covered in white to medium brown spreading hairs, 1–2(3)-seeded.
Corolla 1.2–2 cm long; standard blue to purple; wings violet; keel whitish.
Branches slender to stout, hirsute when young, later glabrescent.
Erect or climbing herb or subshrub 0.7–1.8 m tall.
Seeds 5–7 × 4–6 × 2 mm.
