용담과 Gentianaceae

1. 잎은 대생한다

2. 꽃부리에 거가 있다 ·························································································································112. 닻꽃

2. 꽃부리에 거가 없다

3. 꽃부리에 부편이 없고 밀선이 있다.

4. 꽃부리는 4-5 개로 깊게 갈라져 있다.

5. 밀선구 주변에 털이 있거나 없다    ··································································································쓴풀속

5. 밀선구 주변에 인편이 있다  ··································································································119. 대성쓴풀

4. 꽃부리는 4 개로 알게 갈라져 있다   ···················································································120. 좁은잎덩굴용담

3. 꽃부리에 부편이 있다

6. 식물체는 곧게 자라고 꽃은 위를 향하며 열매는 삭과이다     ·······································································용담속

6. 덩굴식물로서 꽃은 옆을 향하고 열매는 장과이다   ··········································································131. 덩굴용담

1. 잎은 호생하고 꽃잎 가장자리가 안으로 말려서 용담처럼 꼬이지 않는 점이 다르다.

7. 열매는 떨어지지 않는 삭과이고 잎은 단엽이다  ······················································································ 어리연꽃속

7. 열매는 삭과이며 끝에서 불규칙하게 벌어지고 잎은 3출엽이다   ·································································132. 조름나물