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Leaves sometimes sensitive, (10)18–68-foliolate; leaflets 2–12 × 1–2.5 mm, linear to linear-oblong, rounded to slightly emarginate and with a deciduous bristle at the apex, obliquely rounded at the base, subentire or very finely serrulate, margins often ciliolate, glabrous; venation often obscure; petiole and rhachis 1–8(11.5) cm long, glabrescent to hairy; petiolules obsolete; stipules 6–20 × 2–3 mm, lanceolate, straight, spurred, at length deciduous, veined.
Inflorescences axillary, 1 (rarely 2–4)-flowered; peduncle 0.5–5 cm long; rhachis 5–6 cm long; pedicels 0.7–1.5 (3 in fruit) cm long; upper bract sterile, 3–6 mm long, ovate, acuminate; lower bract or bracts 2–4 mm long, ovate, sometimes acuminate, amplexicaul; bracteoles 3–7 × 1–2 mm, ovate-lanceolate, acuminate, mostly ciliate.
Standard orange-yellow to orange, sometimes streaked with crimson, 8–33 mm long and wide, rounded, glabrous; wings and keel greenish, speckled or lined with purple, the petals of the latter bristly and laciniate along their lower margins.
Fruit 3–10 cm long excluding the 4–12 mm stipe, linear, straight or rarely curved, (4)6–28-jointed, glabrous to densely hairy, the margins straight; articles 3–6 × 4–7 mm, oblong, compressed, smooth.
Calyx glabrescent to hairy, 2-lipped, 6–18 × 3–8 mm, oblong, subequal, one lip entire or rarely 2-fid, the other entire or rarely 2–3-fid.
Seeds brown or purplish-brown, 3.8–4.5 × 2.8–3 × 1.5–1.7 mm, irregularly oblong, produced slightly near the small eccentric hilum.
Stems soft at the base, pubescent to hispid with yellow often viscid tubercular-based hairs, sometimes glabrous, often reddish.
Shrubby aromatic herb or small shrub, 0.6–3 m tall, usually erect but rarely straggling.
