괴불나무속 Lonicera LINN.

1. 가지의 골 속은 비어있다.

2. 덩굴성이다  ································································································································464. 인동

2. 곧추자란다.

3. 꽃자루는 잎자루보다 짧다 ·······································································································465. 괴불나무

3 꽃자루는 잎자루보다 길다.

4. 꽃은 분홍색이며 황색으로 변하지 않는다············································································· 480. 분홍괴불나무

4. 꽃은 백색이며 황색으로 변한다.

5. 겨울눈은 길고 뾰족하며 털이 있고 잎은 길게 뾰족하며 뒷면 옆맥 위에 털이나 선점이 있다 ················ 466. 각시괴불나무

5. 겨울눈은 짧고 끝이 둔하며 잎 뒷면에 털이 밀생한다.

6. 잎은 피침형 또는 타원형 점첨두이고 열매의 포는 선형이며 길이가 1-2cm이다 ···························   467. 물앵도나무

6. 잎은 난형 또는 타원형 첨두이며 열매의 포는 피침형으로 길이 1 cm 이하이다    ·····························468. 섬괴불나무

1. 가지의 골 속은 치밀하다.

7. 열매의 소포는 붙어서 열매를 둘러싼다.

8. 열매의 소포는 육질이며 열매는 타원형 또는 구형이고 검게 익으며 종자는 지름 2~3mm이다     ·················469. 댕댕이나무

8. 열매의 소포는 마르고 열매는 둥글고 붉게 익으며 종자는 지름 5mm 이다 ············································470. 구슬댕댕이

7. 열매의 소포는 붙지 않는다.

9. 끝눈은 죽고 포는 크며 소포는 없고 열매는 붉게 익는다.

10. 꽃은 1 개씩 달리고 잎에 털이 있다.

11. 어린 가지에 털이 드문드문 있다  ·····················································································471. 털괴불나무

11. 어린 가지에 털이 거의 없다 ·························································································472. 볼레괴불나무

10. 꽃은 2 개씩 달리고 잎에는 털이 없는 것도 있다.

12. 2 개의 열매는 기부만 합쳐지고 꽃은 잎보다 먼저 피며 잎에 잔털이 있다  ·····································473. 올괴불나무

12. 2 개의 열매는 대부분이 붙어 있고 꽃은 잎과 같이 핀다.

13. 잎자루와 꽃자루는 길이기- 비슷하고 거센 털이 있다   ·······················································474. 길마가지나무

13. 잎자루는 꽃자루보다 짧고 잔털이 있다 ·········································································475. 숫명다래나무

9. 끝눈은 가지로 자란다

14. 겨울눈은 난형이고 아린은 일찍 떨어지며 열매는 붉다.

15. 어린 가지와 꽃자루에 선점이 있고 잎 뒷면에 거센 털과 선점이 있으며 2개의 열매는 1/2 이하가 합쳐진다 ···············476. 왕괴불나무

15. 어린 가지와 꽃자루에 털이 있다.

16. 잎은 뒷면이 녹색이고 표변에 털이 없다 ·····································································  ·476+. 지리괴불나무

16. 잎은 뒷면이 회백색이고 주맥 양쪽에 털이 밀생한다 ····························································· 481+. 흰등괴불

14. 겨울눈은 세장하고 끝이 뾰족하며 아린은 오랫동안 가지에 남아 있다.

17. 꽃자루는 길이 5mm 이하이고 잎에 털이 없다  ······································································477. 청괴불나무

17. 꽃자루는 길이가 lcm 이상이다

18. 잎은 뒷면 전체에 털이 밀생하고 꽃은 자홍색이다 ································································478. 흰괴불나무

18. 잎은 뒷면 맥 상에만 털이 있고 꽃은 적색이다.

19. 열매는 검게 익고 잎은 피침형이며 꽃자루는 길이 3-4cm로서 두 줄로 나열된 털과 선모가 있다 ·······479. 암괴불나무

19. 열매는 붉게 익으며 잎은 난형 또는 넓은 피침형으로서 꽃자루는 길이 1-2cm이며 털이 없다 ···········481. 홀괴불나무