현삼속 Scrophularia LINN.

1. 줄기에 날개가 있다.

2. 옆자루에 날개가 있다.

3. 잎은 난상 장타원형으로 예두 또는 둔두이고 예저이며 예치이고 삭과는 길이 5-8 mm， 지름 4~6mm 이다 ······ 301. 설령개현삼

3. 잎은 넓은 난형으로 둔두이고 원저 또는 아심장저이며 톱니가 둔하며 삭과는 길이와 지름이 8mm 정도이다 ············305. 섬현삼

2. 옆자루에 날개가 없으며 잎은 넓은 난형으로 예두이고 원저 또는 아심장저이며 톱니가 뾰족하다 ······················ 305+. 통영현삼

1. 줄기에 날개가 없다.

4. 원추화서는 좁아서 수상화서같이 보이며 꽃은 황색이고 밀착해 있다 ······························································ 302. 현삼

4. 원추화서는 엉성하게 퍼지고 꽃은 흑자색이다.

5. 꽃은 정생하는 원추화서에 달린다 ································································································ 303. 큰개현삼

5. 꽃은 보통 액생하며 총상으로 나열한다.

6. 식물체에 털이 적다 ················································································································· 304. 토현삼

6. 식물체에 털이 많다 ··········································································································· 304+. 일월토현삼