산초속 Zanthoxylum LINN.

1 가시는 잎자루 양쪽에 있다.

2. 상록성이며 엽축에 날개가 있다 ······································································································ 1005. 개산초

2. 낙엽성이며 엽축에 날개가 없다.

3. 소엽은 7~13 개이다 ················································································································ 1006. 왕초피

3. 소엽은 9-19 개이다 ·············································································································· 1007. 초피나무

1. 가시는 흩어져 있다.

4. 소엽은 길이 5cm 이하이다 ········································································································ 1008. 산초나무

4. 소엽은 길이 7cm 이상이다.

5. 잎자루와 새가지는 녹색이고 소엽은 길이 7-12 cm이다 ··································································· 1009. 머귀나무

5. 잎자루와 새가지는 붉은빛이 돌고 소엽은 길이 7.5 cm 이다 ·························································· 1009+. 좀머귀나무