Annual herbs, 5-30 cm, spreading hairy, sometimes with glandular hairs. Stems diffuse, prostrate or ascending, branched at base. Stipules ovate, base rounded, margin entire or obscurely shallowly serrate, apex acute; petioles slender, 5-10(-20) mm; leaflets obovate, 5-8(-12) × 3-7 mm, papery, villous on both surfaces, base cuneate, margin serrulate in apical 1/3, apex rounded or retuse, apiculate. Flowers 2-10 in capitate racemes; peduncles slender and straight; pedicels short or sessile. Corolla pale yellow, 3-4 mm; standard broadly ovate, longer than wings and keel. Legume globose, 2.5-4.5 mm, tightly coiled in 3-5 spirals; spines straight with hooked tip, equal to radius of legume. Seed long reniform, brown, 1.5-2 mm, smooth. Fl. Mar-Apr, fr. Apr-May.
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