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Leaves 5–13.5 cm long; leaflets 2–9 on each side of the rhachis, opposite or distally subopposite, 6–25 × 2–9 mm, linear-oblong or obovate, truncate to emarginate and mucronulate at the apex, cuneate at the base, very sparsely white hairy beneath, glabrous above; petiole 1–1.5 cm long, with very sparse white hairs; rhachis 1.5–12 cm long, sulcate on the upper side; petiolules up to 1 mm long, with sparse white stiff hairs; stipules 1–3 mm long, lanceolate, with white stiff hairs at the margins.
Pod 1.5–4 × 1–2 cm, ovate or obliquely elliptic, sometimes with the dorsal suture arched, acute to obtuse or rounded at the apex, cuneate to rounded at the base and abruptly tapering into a 2–3 mm long stipe, membranaceous, translucent, brownish, glabrous.
Racemes up to 4 cm long, 3–many-flowered; peduncle 3–8 mm long; bracts 1–1.5 mm long, ovate-lanceolate, with stiff white hairs at the margins; pedicels 7 mm long; bracteoles at the base of the calyx, minute, with stiff hairs.
Filament sheath up to 5 mm long; free parts of the filaments 2.5 mm long; free stamen 6 mm long; anthers less than 1 mm long.
Calyx 2.5–3 mm long, campanulate, divided halfway into 5 equal teeth, with stiff hairs only at the margins.
Erect robust many-stemmed perennial herb up to 1.5 m high, from a woody rootstock.
Ovary c. 4 mm long, oblong, up to 7-ovulate, glabrous; style 2 mm long.
Seeds 1–7, obliquely oblong-reniform, 5 × 3.5 mm, dark brown.
Stems herbaceous and pithy above, branching, glabrous.