느릅나무과 Ulmaceae

1. 열매에 날개가 있다

2. 열매 주위에 날개가 있다    ··············································································································느릅나무속

2. 열매의 한쪽에만 날개가 있다   ······································································································120. 시무나무

1. 열매에 날개가 없다

3. 열매에 소과경이 없다   ···············································································································121. 느티나무

3. 열매에 소과경이 있다.

4. 측맥끝은 톱니까지 닿지 못한다 ········································································································ 팽나무속

4. 측맥끝은 톱니끝까지 닿는다  ····································································································· 131. 푸조나무