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Leaves 5–10-foliolate; leaflets 4–14 × 1.5–6 mm, obliquely elliptic-oblong, slightly to distinctly falcate, acute or subacute at the apex, obliquely subcordate at the base, ciliate with spaced marginal hairs or practically glabrous, 5–6-nerved from the base, the venation prominent on both sides; main nerve eccentric; petiole and rhachis together 3–6 cm long; petiolules minute; stipules 10–20 × 1–3 mm, narrowly lanceolate, acuminate, scarious, ribbed, ciliate, persistent.
Inflorescences axillary in the upper leaves, together forming a dense head, individual parts several–many-flowered, very dense, strobilate, subsessile, 1.5–2.5 cm long; pedicels 4–6 mm long; bracts 5–15 × 3–4.5 mm, obliquely ovate or ovate-lanceolate, acuminate, striate, ciliate; bracteoles 4–8 × 2–3 mm, lanceolate, striate.
Calyx leaf-like and venose, pubescent, 10–14 mm long, 2-lipped; upper lip divided into 2 almost free obovate-oblong lobes 13–14 mm long, each 7.5–9.5 mm wide; lower lip deeply divided into 3 lobes, the outer pair 10–12 × 5.5–6.5(9) mm, ovate or obovate, but the central one small, 6–8 × 2–2.5 mm, elliptic; all lobes ciliate.
Standard bright blue, 8–12 × 8.5–10 mm, round or squarish-obovate, pubescent along the midrib and ciliate along the upper margin; wings blue, ciliate at apex; keel greenish.
Stems with tubercular-based bristly hairs but later glabrous and sometimes with peeling epidermis.
Fruit of 1–2 articles, 4–5 × 4–4.5 mm, each article kettle-drum-shaped, densely pilose.
Erect or decumbent herb or subshrub 12–50 cm tall from a woody rootstock.
Seeds chestnut-brown, 3.5 × 3 × 1.3 mm, oblong-reniform.
