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旋扭山绿豆（Ｄｅｓｍｏｄｉｕｍｉｎｔｏｒｔｕｍ）不仅是营养价值高的牧草，而且是耐阴、高固氮和适于水土保持的植物。本植物由主根、各级侧根和不定根组成庞大的根系．各种根都可长出根瘤。其根瘤形成时间较早．数量较多．８５％以上为有效根瘤．类菌体力棒形．茎半匍匐，分枝多，复盖面积大，节及节间都能产生不定根。其叶较薄．气孔较少．叶绿体较大．其内淀粉粒少．基粒片层较丰富，因而能耐阴、在２０％遮阴下生长最好。
Desmodium indicum is not only a highly nutritious pasture, but also a shade-tolerant, highly nitrogen-fixing plant suitable for soil and water conservation. The plant by the main root, all levels of lateral roots and adventitious roots form a large root system. All kinds of roots can grow nodules. Its nodule formation time earlier. A large number. More than 85% of the effective nodules. Bacteria force stick shape. Stems semi-prostrate, more branches, covering a large area, nodes and internodes can produce adventitious roots. Its leaves are thinner. Stoma less. Chloroplast larger. Its less starch granules. Grains than the rich layer, which can shade-tolerant, the best growth in the shade of 20%.