... , calyx teeth lanceolate, calyx tube length of 1 / 2; corolla purple or orange-yellow, flag flap obovate, 10-11 mm, apex ... 4 mm, with a short beak, black, texture and uplift; seed kidney-shaped, chestnut brown, about 3 mm. Flowering from February ... kg 3500-4000 kg or more high Chinese milk vetch seed