지채과 Scheuchzeriaceae

1. 꽃줄기에 잎이 없고 꽃이 많이 달리며 포가 없다. 심피는 합생하지만 나중에 떨어진다 ············································· 지채속

1. 꽃줄기에 잎이 적고 꽃도 적으며 포가 있다 심피는 거의 떨어진다   ································································27. 장지채

지채속 Triglochin LINN.

1. 심피와 암술머리는 6개씩이고 열매는 장타원형이며 둔원저이고 과병은 비스듬히 선다    ·········································28. 지채

1. 심피와 암술머리는 3 개씩이고 열매는 선형이며 밑으로 좁아지고 과병은 곧다   ··················································29. 물지채