으아리속 Clematis LINN.

1. 꽃은 종같이 생기고 흔히 밑으로 향하며 화피가 옆으로 퍼지지 않는다.

2. 소엽은 밋밋하거나 1~2개의 결각이 있다.

3. 소엽은 3-7개이다.

4. 화피 겉은 암갈색 털이 밀생한다  ·······························································································361. 검종덩굴

4. 화피 겉은 털이 없고 검은 자줏빛이다 ····························································································362. 종덩굴

3. 소엽은 3개이지만 윗부분에서는 단엽 또는 3개로 갈라진다 ·································································· 363. 요강나물

2. 소엽에는 톱니가 있다.

5. 꽃은 한 꽃차례에 여러 개씩 달린다.

6. 꽃은 자주색이고 위로 향한다.

7 화피 열편은 윗부분이 퍼지지 않고 뒤로 말린다 ···········································································364. 병조희풀

7 화피 열편은 윗부분이 넓게 퍼져서 아름답다 ············································································365. 자주조희풀

6. 꽃은 연한 황색이고 밑으로 향한다 ····························································································366. 개버무리

5. 꽃은 잎겨드랑이에 보통 1개씩 달린다.

8. 꽃은 황색이다  ··········································································································· 367. 누른종덩굴

8. 꽃은 하늘색 또는 자주색이다.

9. 정소엽은 난형 심장저이며 뒷면과 잎자루에 털이 많다  ························································· 368. 세잎종덩굴

9. 정소엽은 피침형이며 뒷면과 잎자츠음에 거의 털이 없고 키는 1m 이상이다.

10. 꽃받침은 길이 3.2-3.8 cm로서 하늘색이며 약간 털이 있다 ················································369. 자주종덩굴

10. 꽃받침은 길이 2cm로서 자주색이며 가장자리에 털이 많다 ················································ 370. 함북종덩굴

1. 꽃은 위를 향하며 화피가 수평으로퍼진다.

11. 꽃은지름이 5-15 cm이고 1개씩 달리며 봄에 핀다.

12. 꽃자루에 포가 없다 ············································································································ 371. 큰꽃으아리

12. 꽃자루에 1쌍의 포가 달려 있다 ··································································································· 372. 위령선

11. 꽃은 지름이 5cm 이하이고 여러 개가 꽃차례를 형성하여 여름부터 가을까지 핀다.

13. 잎에는 톱니가 없다.

14. 꽃은 1~3개씩 달리고 열매에 꼬리가 없으며 날개가 있다   ····························································373. 외대으아리

14. 꽃은 많이 달리고 열매에 꼬리가 있다.

15. 원줄기는 곧추 자란다 ································································································374. 좁은잎사위질빵

15. 원줄기는 덩굴성이다.

16. 잎은 예두이며 원저 또는 예저이고 화피 열편은 길이 1.2-2 cm 이다 ·················································375. 으아리

16. 잎은 둔두 아심장저로서 화피 열편은 길이 1.2 cm 정도이다    ·····················································376. 참으아리

13. 잎에 톱니가 있다.

17. 꽃은 취산화서에 3개씩 달린다    ····························································································· 377. 할미밀망

17. 꽃은 원추화서에 많이 달린다.

18. 잎은 3출 간혹 2회 3출이고 열매에 털이 있다  ···········································································378. 사위질빵

18. 잎은 2회 3줄이고 열매는 가장자리에만 털이 있다   ··································································379. 좀사위질빵