长豇豆(长豆角)(Vigna sesquipedalis(L.)Fruwirth.),一年生缠绕性草本,荚果长30—90厘米,阔12毫米,相当厚,肉质,是一种良好的菜蔬,它的三个品种:紫荚长豇豆、青皮红咀燕和白皮红咀燕,在四川、湖北、河北、北京等地广为栽培。这三个品种种子,因为紫荚豇豆的荚皮紫色,种皮也紫色,极易与种子黑色的两个红咀燕品种相区别。但由 The annual cowpea (Vigna sesquipedalis (L.) Fruwirth), annual winding herb, pod 30-90 cm long, 12 mm wide, very thick, succulent, is a good vegetable, and its three varieties : Viburnum long asparagus beans, red peel and red peel Tsui Yan, in Sichuan, Hubei, Hebei, Beijing and other places widely cultivated. The three varieties of seeds, because of purple pods cowpea purple pod, the seed coat is also purple, easily with the seed black two red Tsui Yan varieties are different. But by