개자리속 Medicago LINN.

1. 턱잎에 톱니가 있다. 소엽은 요두이며 열매에 가시가 있다 ······································································977. 개자리

1. 턱잎에 톱니가 없다.

2. 꼬투리는 털이 있고 굽었다.

3. 잎은 타원형 또는 도피침형이며 꼬투리에 털이 있다···································································· 974. 자주개자리

3. 잎은 도란형 또는 원형이고 꼬투리에는 털이 약간 있다 ·································································· 975. 잔개자리

2. 꼬투리는 털이 없고 곧다 ·········································································································976 노랑개자리