진달래속 Rhododendron LINN.

1. 잎은 상록(간혹 낙엽성)이며 씨방과 더불어 선상 (線狀)의 비늘 같은 털이 있다.

2. 꽃은 끝눈에서 여러 개가 핀다.

3. 잎은 뒷면에 비늘 같은 털이 없고 길이가 5cm 이상이며 수술은 10-20 개이다

4. 잎은 뒷면에 털이 없고 갈색이며 꽃은 황색이다    ·······································································15. 노랑만병초

4. 잎은 뒷면에 털이 없고 백색이며 꽃은 연한홍색 또는 연한 황백색이다 ····················································16. 만병초

3. 잎의 뒷면과 씨방에 비늘 같은 털이 있고 길이가 5cm 이하이며 수술은 10개이다.

5. 꽃은 2~6개씩 산형으로 달리고 자홍색이다  ·····················································································17. 황산차

5. 꽃은 총상으로 달리고 희다 ·············································································18. 꼬리진달래(참꽃나무겨우살이)

2. 꽃은 곁눈에서 1 개 또는 여러 개가 피며 수술은 5~10 개이다.

6. 잎은 둔두이며 흔히 겨울에도 남아 있고 길이 1~5cm이며 꽃은 적자색이다 ··············································19. 산진달래

6. 잎은 예두이며 낙엽성이고 길이 3~7 cm 이며 꽃은 연한 적자색이다 ·························································20. 진달래

1. 잎은 낙엽성 또는 상록이며 씨방과 더불어 선상의 비늘털이 없다.

7. 꽃줄기에 포가 없고 꽃은 끝눈에서 1 개 또는 5--6 개가 발달한다.

8. 잔가지에 거센 털이 있다.

9. 꽃부리통은 원통형으로서 꽃의 지름은 1cm 내외이고 희며 수술은 4-5개이다  ············································21. 흰참꽃

9. 꽃부리통은 얕은 종같이 생기고 꽃의 지름은 2cm 이상이다   ································································22. 산철쭉

8. 잔가지에 거센 털이 없고 잎은 가지의 끝 근처에 총생한다.

10. 암술대에 털이 없고 꽃은 적색이며 잎은 4 각상이고 2-3 개씩 총생한다  ················································23. 참꽃나무

10. 암술대에 선모가 있고 꽃은 연한 홍색이며 잎은 도란형 또는 넓은도란형으로서 4~5 개씩총생한다 ····················· 24. 철쭉

7. 꽃줄기에 포가 있으며 꽃은 1~3개씩 가지끝에 달리고 홍색이며 지름 2cm 내외이고 수술은 10 개이며 잎은 도피침형이다 ······················· 25. 좀참꽃