Chinese milk vetch in agro-ecosystems can provide organic matter and soil nitrogen to maintain the agricultural nitrogen cycle Biennial herb, much branched, prostrate, 10-30 cm high, was sparse white pubescence. Movie odd pinnate leaflets 7-13, 5-15 cm long; petiole shorter than the leaf axis, from the students, stipules ovate, 3-6 mm, apex acute, base connate with each other more, and the margin ...