XIII. 뚝사초절

1. 밑부분의 잎집에 잎이 없고 황갈색이며 능선이나 그물 같은 실이 없다.

2. 키는 40~80cm로서 굵고 자화영은 난형이며 예두이다 ····································································· 361. 산꼬리사초

2. 키는 20~50cm로서 다소 가늘고 자화영은 파진 끝의 중앙이 첨두이다 ····················································362. 바랭이사초

1. 밑부분의 잎집은 자주색 또는 갈색이 돌고 딱딱하며 능선과 실그물이 있다.

3. 지하경이 길게 벋어간다.

4. 잎은 안으로 말린다. 잎은 부드럽고 꽃줄기는 3 모지며 과포에 맥이 있다 ·················································· 363. 뚝사초

4. 잎은 뒤로 말리거나 젖혀진다.

5. 과포에 잔점이 밀생한다.

6. 측소수는 1 마디에 2~4 개씩 달리고 연한 자갈색이다     ··························································· 364. 중삿갓사초

6. 소수는 1마디에 1개씩 달리며 자화수는 꽃줄기가 길고 밑으로 처진다 ············································ 365. 산이삭사초

5. 과포에 수지가 있거나 밋밋하다.

7. 성숙한 과포는 부푼 구형이며 가장지리가 둔하다  ·······································································366. 구슬사초

7. 과포는 원반형이며 가장자리가 예리하다.

8. 밑부분의 잎집은 일부 자주색 반점이 있다.

9. 잎은 너비 3~4mm이고 자화수는 지름 5~6mm이며 과포에 맥이 있다 ·········································367. 큰뚝사초

9. 잎은 너비 2~3mm이고 자화수는 지름 3-4mm이며 과포에 맥이 없다  ·········································368. 회색사초

8. 밑부분의 잎집은 볏짚색 내지 갈색이다  ·············································································369. 산비늘사초

3. 포복경이 없다.

10. 밑부분의 잎집에 섬유실이 없다 ································································································370. 갈미사초

10. 밑부분와 잎집에 섬유실이 있다.

11. 과포의 부리는 길다     ·········································································································371. 산뚝사초

11. 과포의 부리는 짧다.

12. 과포는 밋밋하거나 수지 또는 젖꼭지 같은 돌기가 있다.

13. 소수는 짧은 원주형이다     ····························································································372. 왕비늘사초

13. 화수는 원주형이다.

14. 정소수는 자웅성이고 자화영은 파진 끝이 뾰족하고 밑부분의 잎집은 검다  ···································373. 이삭사초

14. 정소수는 웅성(간흑 자웅성)이고 측소수는 암꽃이며 밑부분의 잎집은 갈색이다  ·····························374. 비늘사초

12. 과포는 돌기가 밀생한다.

15. 밑부분의 잎집은 검으며 소수는 작고 떨어져서 달리며 첫째 포는 잎 같고 자화영은 펴침형이며 과포는 부푼 원반형이다 ····················376. 참뚝사초

15. 밑부분의 잎집은 붉은빛이 볼고 소수는 접근하며 포는 인편이나 까락 같고 자화영은 장타원형이며 과포는 원반형이다 ··················377. 붉은포기사초