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江苏省稻麦连作区的野燕麦初步分为栽培型、杂草型两大类型；四个种即野生燕麦、野生莜麦、普通野燕麦和南方野燕麦；两个变种即无毛野燕麦变种、紫壳野燕麦变种；并有褐色野燕麦、黄稃野燕麦、白壳野燕麦、咖啡色壳野燕麦四个生态型。经切片观察，不同种野燕麦的籽实含有不同色素，其含量也不同，形成不同色泽的籽实，江苏范围内有黄色、白色、咖啡色、褐色等不同壳色的野燕麦。江苏的紫壳野燕麦、无毛野燕麦、普通野燕麦的果皮细胞排列整齐、紧密，果皮上的硅质和角质层较厚，新疆野燕麦果皮细胞较疏松，空隙度较大，果皮上的硅质、角质层较薄，其透水性、透气性较江苏上述三个样品大，抗湿性小。野燕麦籽实结构的抗湿性及其在稻田中能够越夏的特性，是江苏稻麦连作区野燕麦发生危害逐年加重的原因之一。
Wild oats in the rice-wheat continuous cropping area of Jiangsu Province are divided into two main types: cultivated type and weed type. Four species are wild oats, wild oats, common wild oats and southern wild oats. Two varieties, , Purple shell wild oats varieties; and brown wild oats, yellow wild oats, white shell wild oats, brown shell oats four ecological type. Slices observed, different species of wild oat seeds contain different colors, its content is also different, the formation of different color of the seed, Jiangsu Province, there are yellow, white, brown, brown and other shell color of wild oat. Jiangsu purple shell wild oats, hairless wild oats, wild oats pericarp cells arranged in neat rows, thicker on the pericarp siliceous and stratum corneum, Xinjiang wild oat peel cells more loose, larger porosity, on the peel Siliceous, stratum corneum thinner, its water permeability, air permeability than the above three samples of Jiangsu, small moisture resistance. Wild oat seed structure of the moisture resistance and its characteristics in the paddy field can be more summer, Jiangsu and wheat continuous cropping areas of wild oats occurrence one of the reasons increasing year by year.