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Inflorescences consisting of short, lax axillary pseudoracemes, sometimes aggregated into axillary and terminal congested panicles; peduncle of the pseudoraceme 4–22 mm long; rhachis of the pseudoraceme 3–50 mm long; peduncle of the panicle 4–12 mm long; rhachis of the panicle 5–55 mm long; pedicels 1–6(8) mm long, white pilose; bracts absent; bracteoles minute, caducous.
Standard purple, sometimes tinged greenish or yellowish outside with deep purple veining inside, 5–9 × 5–8 mm, almost round; wings and keel pale green or yellow, tinged with purple.
Calyx pilose with gold coloured or white hairs; tube 3 mm long; lobes minute, 1–1.5 mm long, upper pair fused along most of their length.
Stems annual, angled, sometimes ribbed, sparsely to densely white or golden pilose, young stems pale green becoming dark grey.
Ovary 4 mm long, linear-oblong, compressed, white pilose; style 3 mm long; stigma minute, terminal, capitate, penicillate.
Seeds reddish-brown speckled black, 4 × 3 × 2 mm; aril narrowly elliptic, creamy-white.
Pods 1.5–3.1 × 0.6–1.6 cm, narrowly oblong, falcate, densely golden pilose, 4–5-seeded.
Erect herb to 1.3 m tall, arising from a perennial tuberous or woody rootstock.