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通过对来自国内外的120个豇豆品种16个性状进行聚类分析，形成了豇豆品种的系统分类。直豆可分为4个品种群和8个品种亚群。Ⅰ．早熟长荚丰产品种群（内含3个品种亚群，33个品种）；Ⅱ．晚熟短荚低产品种群（内含3个品种亚群，26个品种）；Ⅲ．小叶早熟中产品种群（内含2个品种）；Ⅳ．大叶中晚熟中产品种群（内含2个品种亚群，59个品种）。
By clustering the 16 traits of 120 cowpea varieties from home and abroad, the systematic classification of cowpea varieties was formed. Straight beans can be divided into four varieties and eight varieties of subgroups. Ⅰ. Early maturing pod abundance of product populations (including three varieties of subgroups, 33 varieties); Ⅱ. Late maturing short pod low product population (including three varieties of subgroups, 26 varieties); Ⅲ. Premature leaflet product population (containing 2 varieties); Ⅳ. Large leaf mid-late maturity product population (including 2 varieties subgroup, 59 varieties).