명자나무속(모과속) Chaenomeles LINDL.

1. 꽃은 잎이 달린 가지에 1 개씩 달리고 꽃받침잎은 톱니가 있으며 젖혀지고 턱잎이 작다  ······························· 828. 모과나무

1. 꽃은 잎이 없는 가지에 2-3 개씩 모여달리고 꽃받침잎은 서며 밋밋하고 턱잎이 크다.

2. 잎의 톱니는 매우 날카롭고 가지는 밋밋하며 털이 없다 ······································································· 829. 명자꽃

2. 톱니는 끝이 뾰족하거나 둔하고 어린가지에 털이 있으며 늙은가지는 거칠다 ·············································· 830. 풀명자