Erect branched shrub or herb 0.8–4.5 m. tall. Stems puberulous with sometimes viscid tubercular-based hairs when young, later glabrous; epidermis at length peeling in thin pieces. Leaves often fasciculate, 10–30(–48)-foliolate; leaflets linear to linear-obovate, 0.2–1.2 cm. long, 0.5–3 mm. wide, truncate to rounded and mucronate at the apex, obliquely rounded at the base, glabrous; main nerve ± central; petiole and rhachis together 0.6–7 cm. long, somewhat pubescent; petiolules 0.3 mm. long; stipules ovate-lanceolate, 3–9 mm. long, 1–2 mm. wide, acuminate, not appendaged but ± subcordate, nervose, mostly deciduous. Inflorescences axillary or terminal, numerous, often lax, several-flowered; rhachis 2–15 cm. long; peduncle 0.2–1 cm. long; pedicels 1–6 mm. long, glabrous to sparsely puberulous; bracts ovate, 2–3 mm. long, 2–2.5 mm. wide, 2-lobed, soon falling; bracteoles ovate, 2.5–3 mm. long, 1–1.5 mm. wide. Calyx 2-lipped, the lips ovate or oblong, 3–7 mm. long, 2–4.5 mm. wide, one emarginate, the other slightly 3-lobed. Standard yellow with brown or purple veins or pinkish, tinged purple, violin-shaped, 0.5–1.3 cm. long, 3.5–6 mm. wide; wings pale yellow or orange; keel-petals orange to very pale yellow, often veined with reddish-purple, not laciniate. Pods of 1–2 articles joined by a very narrow neck, each elliptic, rounded or semicircular, 5–9 mm. long, 4–6 mm. wide, compressed or somewhat inflated, glabrous, reticulate and later finely to quite strongly rugulose, the tubercles sometimes arranged reticulately. Seeds cream to reddish-brown, ovoid-reniform, compressed, longest dimension 3.6–5 mm., shorter dimension 2.6–3.5 mm., 1.8 mm. thick; hilum small, round, eccentric. Fig. 54/6, p. 366.