Herbs. Stems twining, densely yellow or yellow-green pubescent, spotted with black glands. Leaves pinnately 3-foliolate; stipules ovate to lanceolate, 4-6 mm; petiole 6-10(-14) cm; stipels small, pyramidal; petiolules 3-5 mm, densely pubescent; leaflets ovate to broadly ovate-rhomboid, 5.5-12 × 4.5-8.5 cm, almost membranous, base rounded, slightly cordate, or almost truncate, apex long acuminate and curved; lateral leaflets much smaller, base oblique, both surfaces pubescent, basal veins 3. Raceme 10-15 cm, hairy, densely 40-80-flowered; peduncle 1.5-3 cm. Flowers 1.1-1.3 cm, usually paired or clustered at upper part of inflorescence; pedicels slender, 4-5 mm, pubescent. Calyx ca. 5 mm; lobes acute, unequal, ca. 2 mm. Corolla light purple; standard abaxially pubescent, with obvious callosity inside; keels obtuse. Ovary villous. Legume oblong, 1.7-2 × 0.6-0.7 cm, slightly curved, slightly constricted between seeds, densely tomentose and villous. Seeds usually 2, deep blue or black, lustrous, ovate, 4-6 × 3.5-4 mm. Fl. Mar-Apr, fr. after May.
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