4. 사초목 Cyperales

사초과 Cyperaceae

1. 암꽃은 과포로 싸여 있다      ································································································ 사초아과 Carieoicleae

2. 과포는 주머니같이 생겼고 갈라지지 않았다    ··························································································· 사초속

2. 과포의 한쪽이 밑까지 갈라진다       ····························································································378. 좀바늘사초

1. 암꽃은 과포로 싸여 있지 않다   ······················································································ 방동사니아과 Cyperoideae

3. 소수는 중앙 이상이 가장 넓고 중앙 이상의 인편 몇 개에만 꽃이 달린다.

4. 1 소수 중에서 1 개는 양성화이며 열매 밑에 반이 없고 보통 침 같은 화피가 있으며 열매를 맺는 꽃은 액생한다.

5. 열매를 맺는 꽃은 수꽃 위쪽에 달린다   ·····················································································382. 층층고랭이

5. 열매를 맺는 꽃은 수꽃이나 불완전화보다 밑에 달린다 ·······································································고양이수염속

4. 꽃은 단성이며 암꽃은 소축끝에 달리고 열매 밑에 반이 있다  ··································································너도고랭이속

3. 소수는 많은 꽃이 달리며 중앙 이하가 가장 넓고 모든 인편에 꽃이 달리며 원칙적으로 양성화이다.

6. 소수의 인편은 모두 같으며 나선상으로 배열한다.

7. 암술대와 씨방 사이에 마디가 있으며 암술대는 밑부분이 굵다.

8. 바늘처럼 퇴화한 화피가 있으며 화수는 1 개뿐이고 밑에 잎이 없는 잎집이 있다 ········································· 올방개속

8. 화피가없다.

9. 암술대는 밑부분이 다소 남는다 ·································································································모기골속

9. 암술대는 밑에서 떨어진다 ···································································································· 하늘지기속

7. 암술대와 씨방사이에 마디가 없다.

10. 소수가 성숙하면 긴 솜털이 자란다 ······························································································· 황새풀속

10. 소수는 성숙해도 솜 같은 털이 자라지 않는다.

11. 화피 열편은 바늘 같거나 간혹 없다 ····························································································고랭이속

11. 화피 열편은 2 개이며 식물체에 털이 없다 ············································································· 439. 세대가리

6. 가장 밑의 인편은 다른것과 다르며 인편은 거의 두줄로 배열한다.

12. 소수축은 관절로 끊어지지 않으며 열매는 3 릉형 또는 앞뒤로 편평하다 ··················································· 방동사니속

12. 소수축은 관절로 끊어진다  ···································································································· 458. 파대가리