9. 마디풀목 Polygonales

마디풀과 Ploygonaceae

1. 꽃은 윤생하지 않는다.

2. 종자는 대부분이 꽃받침 안에 들어있으며 배는 배유의 한쪽에 위치하고 자엽에 주름이 없다.

3. 꽃은 잎겨드랑이에 모여 달린다 ········································································································마디풀속

3. 꽃은 수상화서 · 총상화서 및 원추화서에 달린다.

4. 줄기는 꽃줄기같고 가지가 없으며 뿌리에서 돋은 잎이 뚜렷하고 근경은 덩어리이다  ······································ 범꼬리속

4. 줄기는 가지가 갈라지고 뿌리에서 돋은 잎은 뚜렷하지 않거나 없다.

5. 줄기는 곧게 자라고 꽃은 수상화서 또는 두상화서에 달리고 화피에 날개가 생기지 않는다   ······························· 여뀌속

5. 줄기는 덩굴성이거나 비스듬히 선다.

6. 줄기는 비스듬히 서고 꽃은 원추상으로 달린다.

7. 화피에 날개가 있다  ··············································································································호장근속

7. 화피에 날개가 생기지 않는다     ································································································· 싱아속

6. 줄기는 덩굴성이다.

8. 화피는 열매 때 날개가 생긴다     ······························································································ 하수오속

8. 화피는 열매 때에도 날개가 없다     ························································································· 닭의덩굴속

2. 종자는 대부분 꽃받침밖에 있으며 배유는 배의 중심부에 있고 자엽에 주름이 있다    ··········································· 250. 메밀

1. 꽃은 윤생한다.

9. 꽃의 부분은 2 수이다    ·············································································································· 193. 나도수영

9. 꽃의 부분은 3 수이다.

10. 열매에 날개가 있다    ·····················································································································대황속

10. 열매에 날개가 없다     ·····················································································································수영속