물옥잠과 Pontederiaceae

1. 잎자루는 풍선처럼 부풀었다 ··········································································································515. 부레옥잠

1. 잎자루는 부풀지 않았다 ·······················································································································물옥잠속

물옥잠속 Monochoria PRESL

1. 잎은 심정형이며 너비 4-15 cm 이다 ····································································································516. 물옥잠

1. 잎은 넓은 피침형 내지 난상 심장형이며 너비 1.5~4cm 이다  ·····································································517. 물닭개비