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Leaflets 15–30 × 2–6 mm, mostly narrowly elliptic-oblong, the lower ones and those on decumbent shoots relatively broad, thinly to densely pilose; petiole 4–16 mm long; stipules 2–7(11) mm long, linear or linear-lanceolate.
Calyx (7)8–11 mm long, appressed pubescent or pilose; upper lobes 3.5–4.5 mm long, narrowly attenuately triangular; upper and lateral sinuses nearly at the same level and 1.5–2.5 mm higher than the lower sinuses.
Flowers mostly erect or resupinate, pale yellow, 1(2) on wiry leaf-opposed peduncles 0.7–2 cm long; bracts 2–5 mm long, linear; pedicels 1–3 mm long; bracteoles similar to the bract.
Stems slender, ascending or decumbent, 15–35(60) cm long, several to numerous from a taproot, appressed pubescent to pilose.
Standard 1–1.4 cm long, elliptic or ovate, medially pilose outside.
Pod 2.5–3 × 0.3–0.5 cm, linear-oblong, appressed pubescent.
Ovary 18–24-ovulate.
Stamens all joined.
Seeds not seen.
