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Trailing subshrub from a woody rootstock or creeping underground rhizome; stems ridged, pubescent or glabrescent, up to several metres long, forming large patches; flowering shoots erect or ± prostrate; leafy shoots erect, 16–80 cm long; leaves and flowers appearing at the same time but often on different shoots.
Inflorescences terminal and axillary, pseudoracemose or paniculate, 9–55 cm long with few to many branches; peduncles 5–13 cm long; pedicels 2–12 mm long; bracts 3–7 × 1–3 mm, ovate, acuminate, deciduous or sometimes ± persistent.
Calyx pubescent and glandular; tube 4–5 mm long; lobes 6–8 mm long, linear, oblong or lanceolate, the upper pair joined for over half their length.
Standard purple or crimson outside, pink inside, 12–14 × 10 mm, ± round, rounded to emarginate at the apex, with 2 triangular appendages.
Seeds ± black, 7–8 × 5 × 2 mm, oblong-discoid; hilum narrow, 2 mm long.
Pods 4–5.3 × 0.8–1.5 cm, oblanceolate-falcate, glandular pubescent.
