팽나무속 Celtis LINN.

1. 잎끝이 결각상이거나 꼬리처럼 갑자기 길어졌다.

2. 잎끝이 결각상이다.

3. 어린잎과 열매꼭지에 털이 있고 열매는 황색이다 ··············································································122. 산팽나무

3. 잎과 열매꼭지에 털이 없고 열매는 검은 황색이다············································································ 123. 왕팽나무

2. 잎끝이 꼬리처럼 길어졌다.

4. 잎 끝에 톱니가 있다.

5. 윗부분의 톱니는 밑의 것보다 깊고 뾰족하다······································································ 123+. 둥근잎왕팽나무

5. 톱니는 모두 비슷하다.

6. 열매는 황색이다 ··········································································································· 124. 노랑팽나무

6. 열매는 검다 ··················································································································· 125. 검팽나무

4. 잎끝에 톱니가 없다 ···················································································································126. 폭나무

1. 잎끝이 뾰족하거나 길게 뾰족하다.

7. 잎 하반부에 톱니가 없다.

8. 새가지에 털이 있고 잎에 잔톱니가 있으며 열매는 황색이다···································································· 127. 팽나무

8. 새가지에는 대개 털이 없고 잎에는 톱니가 약간 있거나 없으며 열매는 검다 ··········································· 128. 좀풍게나무

7. 잎 하반부에 톱니가 있다.

9. 잎은 거의 둥글다 ··············································································································· 129. 장수팽나무

9. 잎은 난형 또는 타원형이다 ·······································································································130. 풍게나무