Stiffly branched tree 9–24 m. tall, with open rounded crown; bark grey-brown, smooth, but with ridges of scattered corky prickle-tipped emergences; commencing to flower before the leaves develop.. Young branchlets stout, drooping, densely covered with short straight black prickles, scarred, at first ferruginous hairy, later glabrous.. Leaflets rhomboid-ovate, the terminal one broadly so, 5–20 cm. long, 4·7–22 cm. wide, narrowed or acuminate to a very rounded or blunt apex, broadly cuneate or truncate at the base, ferruginous velvety when in very juvenile undeveloped state, but soon completely glabrous save for a very few branched hairs on the midrib beneath, sometimes with small prickles on the main veins and midrib; petiole 6·5–27·5 cm. long, often prickly; rhachis 2·5–8·5 cm. long; petiolules 4–7 mm. long.. Inflorescences dense; rhachis 6–13 cm. long, densely ferruginous tomentose; peduncle 21–27 cm. long, stout at the base, similarly tomentose; pedicels thick, 3 mm. long; bracts linear, thickened in the middle, 1·1 cm. long, just over 1 mm. wide, rather thick, ferruginous pubescent, soon deciduous; bracteoles filiform, 3–4 mm. long, similarly deciduous.. Calyx at first fusiform, narrowed above, often curved, tipped by 5 linear lobes, densely ferruginous tomentellous, later deeply divided to near the base on one side to form a spathe; tubular part 1·5–2·1 cm. long; lobes 6·8 mm. long.. Standard crimson, distinctly and broadly clawed, oblong-elliptic, 4–5·5 cm. long, 1·8–3·5 cm. wide, rounded; wings whitish, ±1·7 cm. long; keel-petals whitish, ± 1 cm. long.. Pods shortly stipitate, very woody, curved or contorted, 9–14 cm. long, 2·2–3 cm. wide, 2–9-seeded, extremely markedly constricted between the seeds (often exaggerated by abortion of several seeds) to form subglobose compartments 2·2–3 cm. in diameter, densely ferruginous tomentose; valves at length completely separating, obscurely wrinkled outside.. Seeds scarlet, oblong-ellipsoid, slightly angled, sometimes canoe-shaped at the ends, longest dimension 1·1–1·5 cm., shorter dimension 7·5–8·5 mm.; hilum black, elliptic, 7–8·5 mm. long, 4 mm. wide, margined by a thin adnate rim-aril.
Can be grown by cuttings or seedlings. Seeds needs soaking.