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Leaves fasciculate on reduced shoots, 10–24-foliolate; leaflets 3–10 × 1–2 mm, linear-spathulate, often falcate, acute at the apex, cuneate at the base, ciliate and sparsely bristly with tubercular-based hairs on the main nerve beneath; basal nerves 2–4, the main one central or submarginal; petiole and rhachis together 12–22 mm long; petiolules minute; stipules 6–10 × 3–4 mm, lanceolate, acuminate, scarious, ciliate, glabrescent, persistent.
Inflorescences axillary in upper leaves, very dense, subsessile, 15–20 mm long; pedicels 2–3 mm long; bracts 5–13 × 4–5 mm, ovate-triangular, long-cuspidate or acuminate, ciliate with long hairs, with conspicuous main nerve; bracteoles free, 5–7 × 2–3 mm, ovate or lanceolate, falcate, acuminate, ciliate with long hairs.
Calyx ciliate, 6–7 mm long, 2-lipped; lips oblong, the upper deeply emarginate, the lower divided for one-half to two-thirds of its length into 3 ovate acuminate lobes.
Standard bluish outside, deep blue inside with yellow at the base, 6–13 × 3–4 mm, squarish-obovate, glabrous; wings deep blue; keel hyaline with blue veins.
A shrub similar to S. speciosa with smaller blue flowers.
Seeds chestnut-brown, bluntly trigonous, 2.5 × 2 × 1 mm.
Fruit of 1–2 articles; articles 3–4 × 2.5–4 mm, pilose.
Erect or sprawling subshrub 0.3–2.4 m tall.
Stems bristly with tubercular-based hairs.
