甘薯近缘野生种三浅裂野牵牛(Ipomoea trifida)、白花野牵牛(Ipomoea leucantha)和甘薯(Ipomoea batatas Lam)同属甘薯属(Ipomoea)。甘薯是六倍体种(2n=90)。三浅裂野牵牛是个复合种,有六倍体种(2n=90)、四倍体种(2n=60)、和二倍体种(2n=30)。白花野牵牛是二倍体种(2n=30)。六倍体三浅裂野牵牛在国内外的甘薯育种中均已应用,如日本利用它育成了高淀粉、高产、抗线虫的新品种“南丰”,江苏省农科院从70年代末直接或间接地利用它与甘薯杂交选育出了丰产、 Ipomoea trifida, Ipomoea leucantha and Ipomoea batatas Lam were all belong to Ipomoea. Sweet potato is hexaploid (2n = 90). Three Shallow-field wild cows is a composite species with hexaploid species (2n = 90), tetraploid species (2n = 60), and diploid species (2n = 30). White Horny is a diploid (2n = 30). Hexaploid three-lobed wild cows have been used in sweet potato breeding both at home and abroad. For example, Japan has used it to breed “Nanfeng”, a new variety with high starch, high yield and resistance to nematodes. Jiangsu Academy of Agricultural Sciences from the late 70s Direct or indirect use it with sweet potato bred to bred a high yield,