四棱豆(Psophocarpus tetragonolobus)又名翼豆。分布于亚洲和非洲的热带雨林地区。它地上部分能长豆荚,地下能结薯块,又有根瘤固氮,并兼有粮、油、蔬菜、饲料、绿肥等多种用途。我国经过几年的引种试验,已在许多省市推广,但在长江以北的地区由于不能收到成熟种子,每年都要 Pisophocarpus tetragonolobus, also known as wing beans. Distributed in tropical rain forest areas in Asia and Africa. It can be part of the long ground pods, tubers can be underground, and nodules nitrogen fixation, and both food, oil, vegetables, feed, green manure and other purposes. After several years of introduction test in our country, it has been popularized in many provinces and cities. However, in the area north of the Yangtze River, since mature seeds can not be received, every year