5. 천남성목 Arales

1. 불염포로 싸인 육수화서가 특색이며 육상에서 습지를 거쳐 물에서도 자란다 ·············································· 천남성과 Araceae

1. 줄기 · 잎 및 꽃은 퇴화하여 수술과 암술만이 남아서 물 위에 떠서 산다···············································개구리밥과 Lemnaceae