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Leaves 1-foliolate; leaflet 3–20 × 0.6–4.5 cm, oblong or ovate-lanceolate to lanceolate, acute at the apex, cordate or amplexicaul; sparsely to rather densely hairy on both surfaces, glandular beneath; petiole obsolete; petiolule 1–3 mm long; stipules 5–20 × 2–3(4) mm, lanceolate, hairy, veined.
Racemes axillary or apparently terminal, the flowering part 1.5–9 × 0.8–1.8 cm; peduncle 1–3.5 cm long, densely covered with short white hairs and long ferruginous hairs; pedicels c. 1 mm long; bracts deciduous, 6–11 mm long, linear-lanceolate, hairy.
Calyx 6–11 mm long, with short appressed hairs, dense long stiff spreading ferruginous hairs and glands; lobes filiform, very unequal, the lower sometimes scarcely longer than the tube, the upper up to 6 times as long.
Standard yellow, sometimes flushed or lined with brown, 5–7.5 × 2.5–4 mm, oblong or obovate-oblong, glandular and pubescent; wings and keel yellow.
Erect perennial herb 0.15–1.25 m tall, with a single sparsely branched stem from a small napiform or subglobose tuber 1.5–5 × 1–1.8 cm.
A herb. It keeps growing from year to year. It has a few stems. It grows 1 m high. It has a tuberous root 1.5 cm wide by 5 cm long.
Pods 7–10 × 5–7 mm, elliptic-oblong, apiculate, covered with short pubescence, glands and long ferruginous hairs c. 2 mm long.
Seeds chestnut-brown with dark mottling or greenish, 3.8 × 2 × 1.2 mm, oblong, compressed.
Stems with ± appressed white hairs and also spreading longer ferruginous hairs.
