천남성과 Araceae

1. 화피가 있고 꽃은 양성이다.

2. 잎은 선형이며 불염포는 잎처럼 생기고 꽃차례를 감싸지 않는다  ·······································································창포속

2. 잎은 넓고 불염포는 꽃차례를 싸거나 덮는다  ·························································································앉은부채속

1. 화피가 없다.

3. 꽃차례 위에 부속체가 없다.

4. 수술은 합생한다  ··························································································································463. 토란

4. 수술은 떨어진다 ······················································································································· 464. 산부채

3. 꽃차례 위에 부속체가 있다.

5. 암꽃과 수꽃은 연속하여 달린다   ·······································································································465. 곤약

5. 암꽃과 수꽃 사이에 공간이 있다.

6. 밑씨는 1 개씩이며 자화서의 뒷면은 포와 붙어 있다     ··············································································반하속

6. 밑씨는 2개씩이며 꽃차례는 포와 붙지 않는다 ·······················································································천남성속