Ⅴ. 양지사초절 Sec. Praecoces

1. 수과 끝은 부리 같고 밑은 원반같이 굵어졌으며 암술머리는 2~3 개이다.

2. 암술따라는 2 개이며 소수는 성숙하면 흰빛으로 된다 ············································································272. 왕밀사초

2. 암술머리는 3 개이지만 간혹 2 개인 것도 있다.

3. 과포의 능선부에 꺼진 곳이 있고 잎에는 털이 있다  ·········································································273. 갯보리사초

3. 과포의 능선부에 꺼진 곳이 없다.

4. 잎은 딱딱하고 소수는 3~6개이다. 측소수는 자웅성이며 짧은 원주형이며 많은 꽃이 달리고 영에는 긴 까락이 있으며 과포에는 맥이 많다 ·························274. 밀사초

4. 잎은 부드럽고 소수는 2~3 개이다. 측소수는 암꽃만이 달라고 장타원형 내지 구형 이며 꽃이 적고 영은 미첨두이다.

5. 밑부분의 잎집은 실같이 풀어지고 잎은 너비 2~3mm아며 소수는 흔히 2개이고 부리 끝은 깊게 2 개로 갈라진다 ································275. 피사초

5. 밑부분의 잎집은 부분적으로 풀어지게 되고 잎은 너비 4~8mm 이며 소수는 흔히 3 개이고 과포의 부리는 크게 2 개로 갈라진다 ························276. 젋은잎피사초

1. 수과 끝은 주교관형， 원추형 또는 원반형으로 수과체와의 경계가 희미하다.

6. 과포는 푸라스코형이고 위쪽은 원반형이며 수과와 부속체 사이의 경계가 뚜렷하지 않다  ·······························277. 긴목포사초

6. 과포는 도란형이고 위쪽이 늘어져서 원추형 또는 주교관 같은 암술대 밑을 덮고 있다.

7. 웅화영은 끝이 둔하거나 뾰족하지만 2 개로 갈라지지 않았으며 긴 까락이 없다.

8. 웅화영은 담녹색이다.

9. 웅소수는 가늘고 다음 자소수보다 짧다   ······················································································278. 겨사초

9. 웅소수는 곤봉상이며 다음 자소수보다 위쪽에 있다.

10. 총생하며 내륙산이다     ······································································································279. 청사초

10. 포복지가 있으며 해안산이다 ··························································································· 279+. 갯청사초

8. 웅화영은 황갈색이 돌거나 적갈색이다.

11. 지하경이 길다.

12. 포기는 소생하고 지상부의 잎집은 녹색이며 적자색 또는 흰색이 돌고 다소 섬유상 으로 풀어진다.

13. 밑부분의 잎집에 잎새가 있다. 소수는 짧고 장타원형이며 꽃이 다소 배게 달린다.

14. 인편은 담황갈색이다   ··································································································280. 양지사초

14. 인편은 밤색이다    ·······································································································281. 갈색사초

13. 밑부분의 잎집에는 다소 잎이 없다. 소수는 긴 원주상이며 꽃이 다소 성글게 달린다.

15. 잎새와 잎집은 털이 없다

16. 잎새는 너비 1.5mm이며 그리 말려들지 않고 포의 잎새는 소수보다 길며 밑부분의 잎집은 희다   ··········282. 선사초

16. 잎은 너비 1mm 이하이며 때로 안으로 말린다 ····································································284. 실사초

15. 밑부분의 잎집은 적자색이다 ······················································································283. 녹빛실사초

12. 포기는 촘촘히 나오고 밑부분의 잎집은 흑갈색이며 섬유가 세로로 분해하여 줄기의 밑을 싼다  ·············· 286. 실청사초

11. 포복지가 없다.

17. 첫째포의 잎집은 짧고 소수는 장타원형이며 적은 꽃이 촘촘히 달린다 ············································· 287. 설령사초

17. 포의 잎집은 길고 소수는 가는 원주상이며 많은 꽃이 다소 성글게 달린다.

18. 웅화영은 가장자리에서 합쳐서 컵같이되고 소수의 높이는 비슷하다 ··········································· 288. 반들사초

18. 웅화영은 비늘같다    ································································································ 290. 가지청사초

7. 웅화영은 끝이 파지거나 2 개로 갈라지고 중앙에서 까락이 돋는다 ··························································291. 애기사초