단풍나무과 Aceraceae

단풍나무속 Acer LINN.

1. 잎은 단엽이다.

2. 잎에 3개의 큰 맥이 있다.

3. 잎 열편에 톱니가 있다.

4. 잎의 뒷면은 녹색이다.

5. 잎에 털이 없거나 약간 있다 ·································································································· 1090. 신나무

5. 적어도 엽맥에 털이 있다 ································································································ 1091. 청시닥나무

4. 잎의 뒷면은 분벡색이다 ········································································································· 1092. 꽃단풍

3. 잎 열편에 톱니가 없다 ··········································································································· 1093. 중국단풍

2. 잎에 5개 또는 더 많은 맥이 있다.

6. 잎에 5 개의 큰 맥이나 열편이 있고 열편 사이의 만은 모가 진다.

7. 열편은 다시 갈라져도 톱니는 없다.

8. 열편은 다시 갈라지지 않는다 ··························································································· 1094. 고로쇠나무

8. 중앙열편이 다시 갈라지는 것이 있다 ················································································ 1095. 만주고로쇠

7. 열편에 톱니가 있다.

9. 잎에 털이 있다.

10. 잎자루가 붉지 않다

11. 잎은 길이의 1/2 정도로 갈라진다 ·············································································· 1091. 청시닥나무

11. 잎은 길이의 1/2 이하로 갈라진다 ·············································································· 1096. 부게꽃나무

10. 잎자루가 붉다 ··········································································································1097. 시닥나무

9. 잎에 털이 없다. 잎은 5각형이고 잔톱니가 있다 ···································································· 1098. 산겨릅나무

6. 열편사이의 만은 둥글다. 둥글지 않은것은 7 개 이상의 열편이 있다.

12. 열편 사이의 만은 둥글다.

13. 열편은 다시 갈라지고 뾰족한 톱니가 있다 ··············································································· 1099. 은단풍

13. 열편은 결각 같이 갈라지고 뾰족한 톱니가 없다 ·······································································1100. 설탕단풍

12. 잎은 6 개 이상 갈라지고 열편 사이는 점점 좁아진다.

14. 잎은 6~9 개로 갈라지고 열편에 톱니가 없다 ······································································ 1101. 우산고로쇠

14. 잎은 7 개이상 갈라지며 열편에 톱니가 있다.

15. 잎은 길이 5~6cm 이다 ································································································· 1102. 단풍나무

15. 잎은 길이 6cm 이상이다.

16. 잎은 길이 7~10cm 로서 9~11 맥이 있다 ···········································································1103. 당단풍

16. 잎은길이 10cm 정도로서 11 ~13 개(간흑 14 개)로 갈라진다 ·············································· 1104. 섬단풍나무

1. 잎은 복엽이다.

17. 소엽은 3 개이다.

18. 소엽에 톱니가 없거나 2~3 개씩 있고 잎자루에 털이 있으며 열매는 3 개씩 달리고 털이 있다 ························1105. 복자기

18. 소엽에 톱니가 많고 잎자루에 털이 없으며 열매는 3~5 개로서 털이 없다 ··············································1106. 복장나무

17. 소엽은 3-9 개이지만 보통 3-5 개이다 ························································································1107. 네군도단풀