통발속 Utricularia LINN.

1. 뿌리는 땅속에 들어 있다.

2. 단엽이다.

3 잎과 포는 중간에서 방패처럼 달리고 꽃은 자주색이다    ······································································382. 이삭귀개

3. 잎과 포는 밑에서 달라고 꽃은 황색이다          ···················································································383. 땅귀개

2. 잎은 복엽이다    ··························································································································384. 개통발

1. 식물체는 물에 떠 있다.

4. 소화정은 길이 6-10 mm(l2 mm) 이며 열매가 익으면 굵어져서 밑을 향하고 꽃부리와 거에 털이 있다 ·······················385. 들통발

4. 소화경은 길이 1.5-2.5 cm 이며 열매 때에도 굵어지지 않고 꽃부리에 털이 없다    ················································386. 통발