바늘꽃속 Epilobium LINN.
1. 잎은 호생한다 ·······················································································································1284. 분홍바늘꽃
1. 잎은 대생한다.
2. 암술머 리는 4 개로 갈라진다 ····································································································1285. 큰바늘꽃
2. 암술머리는 갈라지지 않는다.
3 잎에 톱니가 없다.
4. 줄기에 능선이 있고 씨방에 털이 없다 ····················································································1287. 장진바늘꽃
4. 줄기에 능선이 없고 씨방에 털이 있다.
5. 땅속에 포복지가 있다. 꽃잎은 길이 5-9mm 이다 ····································································1286. 버들바늘꽃
5. 땅속에 짧은 포복지가 자랄 때도 있으며 꽃잎은 길이 3.5-4.5mm 이다 ··········································1288. 회령바늘꽃
3. 잎에 톱니가 있으며, 톱니가 뚜렷하지 않을 때에는 포복지가 없다.
6. 암술머리는 둥글고 잎은 양끝이 좁다.
7. 씨방에 털이 거의 없다. 종자는 검고 털은 희다 ·····································································1289. 두메바늘꽃
7. 씨방에 털이 있다.
8. 줄기에는 능선에 굽은 털이 있고 씨방에 선모가 있다 ·····························································1290. 호바늘꽃
8. 줄기에 굽은 털이 있거나 또는 없고 씨방에 선모가 없다 ···························································1291. 돌바늘꽃
6. 암술머리는 방망이처럼 길다.
9. 포복지가 있다. 씨방에 선모가 있고 종모는 적갈색이다 ··································································1292. 바늘꽃
9. 포복지가 없다. 지상부에 새싹이 돋는다. 능선이 있고 씨방에는 굽은 털과 선모가 있으며 종모는 희다 ········1293. 줄바늘꽃