용담속 Gentiana LINN.

1. 1-2 년초로서 곧추자라고 지하경이 없으며 꽃부리 열편 사이에 부열편이 있다.

2. 꽃받침잎은 난형 또는 도란형이고 퍼지거나 뒤로 젖혀졌으며 가지에 젖꼭지 같은 돌기가 있다·························· 121. 구슬붕이

2. 꽃받침잎은 피침형 또는 좁은 3각형이고 위를 향한다.

3. 뿌리에서 돋은 잎이 없다. 밑에 달린 잎은 보다 작고 줄기의 마디 밑에 젖꼭지 같은 돌기가 있다 ··················· 122. 큰구슬붕이

3. 뿌리에서 돋은 잎이 있다.

4. 줄기에 돌기가 없고 꽃은 연한 자주색이다.

5. 꽃은 담자색이다 ··········································································································· 123. 봄구슬붕이

5. 꽃은 하늘색 또는 흰색이다 ··································································································· 고산구슬붕이

4. 줄기에 돌기가 있으며 꽃은 희다 ·····························································································124. 흰그늘용담

1. 다년초이며 지하경이 있거나 줄기의 밑부분이 옆으로 자란다.

6. 줄기의 밑부분이 앞으로 자라며 꽃은 짙은 벽자색이다 ··········································································125. 비로용담

6. 지하경이 있으며 줄기는 곧추 자란다.

7. 꽃이 필 때 뿌리에서 돋은 잎이 있거나 뿌리에서 돋은 잎이 달린 단지가 있다 ·············································· 126. 산용담

7. 뿌리에서 돋은 잎이 없고 밑의 잎은 비늘같이 작다.

8. 잎은 녹색이며 가장자리에 돌기가 있어 깔깔하고 줄기는 보통 홍자색이 돈다.

9. 잎은 3 맥이다 ······················································································································· 127. 용담

9. 잎은 1 맥이다 ··············································································································· 128. 진퍼리용담

8. 잎은 녹백색이며 가장자리는 거의 밋밋하고 줄기는 담녹색이며 지하경이 굵다.

10. 꽃받침통은 길이 12-15mm 이다 ···························································································· 129. 과남풀

10. 꽃받침은 길이 20-25mm 이다.

11. 꽃은 밖에서 안쪽으로 피어간다 ························································································· 130. 칼잎용담

11. 꽃은 중앙에서 밖으로 피어간다 ························································································· 130十. 큰용담