Herbs perennial, ca. 70 cm tall. Stem erect, unbranched or few branched, puberulent. Leaves subsessile, paripinnate; stipules ovate-lanceolate, margin entire; leaflets 1-paired, broadly ovate to subrhomboid, 40-70(-100) × 35-50(-170) mm, glabrous or pilose at margin and along veins, apex acute; tendril absent, replaced by a mucro. Raceme abbreviated to capitate, shorter than leaf, densely flowered. Calyx campanulate, 8-10 mm, villous. Corolla purple, rarely white; standard oblong-obovate, 10-14 mm, equaling wings and longer than keel. Legume obliquely oblong, 25-30 × ca. 5 mm, glabrous, apex beaked. Fl. and fr. Jul-Sep. 2n = 12, 24.
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