Soil erosion control in rivers and reservoirs to use what Expressway Slope shrub seeds seeds for general use with three peas topped. Governance in rivers and reservoirs and soil erosion control can be used Crotalaria, pigeon pea, multi Mulan, bicolor, Amorpha, sumac and other Crotalaria morphological characteristics: tall, erect herb, up to 1.5 m; stems rough shape, cylindrical, rusty pubescent. Stipules small, linear, appressed to petiole on both sides; a single leaf, leaf quality thin, oblanceolate or oblong, apex obtuse, with small mucronate, base cuneate, 5-15 cm long, wide 2-4 cm, no hair on top of, below ferruginous pubescent; petiole 2-3 mm long, term or axillary racemes, flowers 20-30 flowers; bracts linear, 2-3 mm long, bracteoles and bracts similar shape, usually shorter; calyx two lipped, 10-15 mm long, calyx teeth lanceolate triangular, ca. as long as calyx, pubescent; corolla yellow, petal round or oval , 15-20 mm long, base with two corpus callosum, apex slightly concave or round, petals oblong, 15-18 mm long, keel bent, a few up to 90 degrees above the middle narrowed to form a long beak, protruding calyx outside; ovary glabrous. Pod oblong, 4-6 cm, diameter of about 1.5 cm, fruit neck about 5 mm; seeds 20-30 pieces. Fruit period from May to December time. Crotalaria, leguminous perennial erect herb or dwarf shrub. Nestled stems pubescent. Toughness is a strong plant in the riverbed, the bank side, the sun in the sky, sandy gravel environment more growth. Whole plant for medicinal plants and roots, which relieves congestion whole grass, clear heat and so on. Modern clinical trial in the anti-tumor effect is better, mainly squamous cell carcinoma, basal cell carcinoma is curative. ? In addition, this type is also used as green manure plants and garden plants.