Herbs perennial, 40-70 cm tall. Stem erect, rarely branched, glabrous, narrowly winged. Leaves aristate at apex; rachis narrowly winged; stipules semisagittate, 15-25 × 3-8(-12) mm, rarely dentate; leaflets (2 or)3-5-paired, narrowly ovate to oblanceolate, glabrous, with 3(-5) parallel veins raised abaxially and sunken adaxially, apex acuminate. Raceme shorter than leaf, 3-8-flowered; bracts membranous, persistent. Calyx campanulate, glabrous; longest tooth ca. 5 mm, equaling tube. Corolla purple, 13-18 mm; standard orbicular, with claw; wings shorter than standard, auriculate at base. Ovary linear, glabrous. Legume black-brown, linear, 3.7-4.5 cm, glabrous. Seeds brown, subglobose, smooth. Fl. May-Jun, fr. Jun-Aug.
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A herb. It keeps growing from year to year. It grows 60 cm tall. The stems are erect and have narrow wings. The leaves are 15-25 mm long by 3-8 mm wide and have 3-5 pairs of leaflets. The fruit are narrow pods 4 cm long. The seeds are brown and smooth.
Can be grown by seedlings. Seeds needs soaking.
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