괭이눈속 Chrysosplenium LINN.

1. 잎은 대생한다.

2. 털이 있다.

3. 포복경이 없다   ················································································································· 645. 흰털괭이눈

3. 포복경이 있다.

4. 꽃받침잎은 수평으로 퍼진다. 꽃은 녹색이거나 녹색바탕에 자주색 또는 자갈색이 돈다 ·························· 646. 가지괭이눈

4. 꽃받침은 선다.

5. 포복경에 털이 있으며 종자에는 줄을 짓는 돌기가 있다  ···························································· 648. 제주괭이눈

5. 포복경 끝에 털이 밀생하며 종자에 젖꼭지 같은 돌기가 있다 ························································· 644. 털괭이눈

2. 털이 없다.

6. 꽃은 연한 황록색이다 ········································································································· 647. 바위괭이눈

6. 꽃의 옆이나 바로 밑에 달린 잎은 황색이다.

7. 꽃 옆의 잎은 황색이다 ··········································································································· 649. 괭이눈

7. 꽃 바로 밑에 달린 잎은 황색이다 ···························································································· 650. 선괭이눈

1. 잎은 호생한다.

8. 꽃은 녹색 또는 녹황색이고 종자에 돌기가 있다.

9. 톱니 끝은 둥글고 지상 포복경이 있다 ······················································································· 651. 애기괭이눈

9. 톱니 끝은 낮고 편평하며 포복경이 없고 꽃이 핀다음 기부에 실눈이 생긴다  ············································ 652. 산괭이눈

8. 꽃은 밝은 황색이고 지상 포복경이 있으며 종자는 밋밋하다 ····························································· 653. 오대산괭이눈