Inflorescences axillary, 1–3-flowered; peduncle 1.8–5 cm long; rhachis 6–13 mm long; bracts 1–1.5 × 0.7–1 mm, lanceolate, persistent; bracteoles 1–2 × 1 mm, persistent.
Calyx glabrous; tube 3–4.5 mm long; lobes 0.5–1.8 mm long, ± round, minutely ciliolate, the 2 upper joined to form a rounded lip.
Climbing or procumbent herb to c. 1 m long, from a woody rootstock; stems ± glabrous.
Seeds black or speckled, 5–7 × 3–4 × 2 mm, oblong-cylindric (see note).
Flowers purple; standard 1.5–2 × 1.2–2.7 cm, deeply emarginate.
Pods black, 5–9 cm × 5–8 mm, linear, glabrous.
Ovary 10 mm long, linear; style 8 mm long.