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Leaves 1-foliolate above, 3-foliolate below; leaflets 8–22 × 0.5–4 mm, mostly linear-oblanceolate, acute, lower ones sometimes oblong-oblanceolate, appressed puberulous beneath; petiole 1–5(7) mm long; stipules 0.
Calyx 3.5–4.5 mm long, with appressed to irregularly arranged hairs; upper lobes narrowly triangular, slightly acuminate, 1.5–2 times as long as the tube.
Racemes 3–18 cm long, very laxly 4–12-flowered, sometimes with a few flowers in the axils below; bracts 1.5–2.5 mm long, linear, shorter than the pedicel.
Pod subsessile, 6–9 × 3–6 mm, shortly oblong-ellipsoid to ellipsoid-globose, pubescent, 16–20-seeded.
Slender erect branching annual 20–70 cm tall; stem densely appressed puberulous.
Seeds 2 mm across, oblique-cordiform, smooth.
