자운영속 Astragalus LINN.

1. 꽃은 황색이다.

2. 소엽은 요두이다 ····························································································································설령황기

2. 소엽은 둔두， 원두 또는 예두이다.

3. 곧추 자란다 ····························································································································· 963.황기

3. 비스듬히 옆으로 자란다.

4. 총생하여 옆으로 자란다 ······································································································· 964. 제주황기

4. 가지가 갈라져서 자운영같이 비스듬히 자란다  ·········································································· 964+. 정선황기

1. 꽃은 자주색 · 적색 · 백색 등이다.

5. 꽃차례는 산형이며 줄기는 총생한다 ································································································· 966. 자운영

5. 꽃은 총상화서에 달린다.

6. 소엽은5~8쌍이다. 꽃받침은 길이 6mm이고 꽃받침잎은 길이 3mm이다 ················································· 967. 자주황기

6. 소엽은 8~13 쌍이다. 꽃받침의 첫째 꽃받침잎은 꽃받침통 길이의 1/3 이다  ·················································965. 개황기