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Leaflets rather thick, 2 × 8.5 × 1.3–4 cm, ovate or elliptic, the laterals slightly oblique, obtuse or emarginate at the apex, ± rounded at the base, finely appressed pubescent with greyish or ferruginous hairs above, more densely so beneath, the margin slightly crenate; petiole 1–6 cm long; rhachis 4–12 mm long; petiolules 3–4 mm long; stipules 4 × 1 mm, lanceolate, deciduous.
Standard very dark purple or almost black, 2–2.5 × 1.6 cm, ovate; wings dark, 2.5–3 cm long, with appressed golden pubescence outside; keel dark or white, 2.8–3.5 cm long, the tip horny; staminal tube white, tipped pale red or purplish.
Inflorescences 2–6 cm long above a peduncle 1.5–2 cm long, the latter often becoming thick and woody; flowers several per node, on pedicels 0.9–1.5 cm long; bracteoles 10 × 3 mm, linear-lanceolate.
Seeds dark grey-brown, brown or red (fide Hauman), 7–8.5 × 4–7 × 3–4 mm, oblong-reniform or rounded-oblong; hilum central, 3 mm long; rim aril black (or white, fide Hauman).
Pods oblong, 3.5–6.8 × 0.8–1.4 cm, very densely covered with blackish or golden somewhat irritant bristles.
Calyx with dense appressed golden or ferruginous pubesence; tube 4–5 mm long; lobes 4–8 mm long.
Stems at first golden pubescent or with appressed ferruginous hairs, later glabrous.
Small erect shrub or subshrub 0.9–2.4 m tall from a stout fibrous rootstock.
