개밀속 Agropyron GAERTN.

1. 이삭은 다소 처지며 까락이 길고 지하경이 없다.

2. 내영은 호영보다 짧다    ············································································································229. 속털개밀

2. 내영과 호영의 길이는 비슷하다.

3. 까락은 곧으며 소수는 피침형이고 옆으로 편평하다.

4. 포영은 3~5 맥이 있다.

5. 포영과 호영은 털이 없다     ·····································································································230. 개밀

5. 포영과 호영은 털이 있다 ···································································································231. 자주개밀

4. 포영은 5~7맥이 있고 털이 없으며 길이가 다르고 6-8mm이다  ··························································232. 광릉개밀

3. 까락은 굽였으며 소수는 원주형이다  ······························································································233. 털개밀

1. 이삭은 곧게 서고 까락이 없거나 매우 짧으며 지하경이 있다    ·······························································234. 개밀아재비