IX. 바늘사초절

1. 소수는 꽃줄기 끝에 1 개씩 달린다.

2. 자화영은 밤색 또는 검은적색이며 과포는 흔히 밤색 점이나 무늬가 있고 부리는 급하게 짧다  ·····························307. 눈사초

2. 자화영은 색깔이 연하거나 담황색이며 간혹 붉은빛이 돈다.

3. 과포는 맥이 많고 털이 없으며 암술대는 길고 유연하다   ·································································314. 산바늘사초

3. 과포는 얇은 막질이며 다소 서거나 옆으로 젖혀지고 맥이 많으며 암술대는 떨어진다.

4. 소수는 원추형이며 꽃이 드문드문 달라고 과포는 길이 5-6mm 이다    ··············································308. 뿌리대사초

4. 꽃은 조밀하게 달리고 과포는 결이 1.5~4mm로서 습기가 있는 곳애서 자란다.

5. 잎은 안으로 말라고 너비 1mm 정도이며 과포는 길이 2mm 정도로서 맥이 없다      ·························309. 애기바늘사초

5. 잎은 말리지 않고 너비 1.5-3 mm이며 괴-포는 길이 2.5-3mm이며 잔맥이 있다  ···································310. 바늘사초

6. 소수는 길이 5-20mrn로서 꽃이 다소 많고 과포는 헐겁게 들어 있으며 수과는 편평하지 않다.

7. 과포는 좁은 난형이며 길이 2-3.5mm 로서 위쪽이 긴 부리형이다   ··········································311. 개바늘사초

7. 과포는 넓은 난형 또는 난형이며 급히 짧은 부리로 된다.

8. 소수는 길이 1-2cm이고 과포는 길이 1.5-2 mm이다  ··························································312. 솔잎사초

8. 소수는 길이 5-12mm 이고 과포는 길이 2.5-4mm 이다  ·····················································313. 잔솔잎사초

6. 성숙한 괴포는 젖혀지고 길이 6-6.5mm이며 두꺼운 막질이고 좁은 피침형이다  ·····························314. 산바늘사초

1. 소수는 여러 개가 달리며 총상 또는 다발형으로 배열한다.

9. 성숙한 과포는 옆으로 벌어지거나 밑으로 젖혀지며 마르면 갈색 또는 검은빛이 돌지만 과포가 공추선 것은 마르면 겸은녹색으로 변한다.

10. 성숙한 과포는 붉은갈색이며 편압된 3모형이다.

11. 포의 밑은 통으로 되어 있으며 과포는 맥이 뚜렷하고 작은 돌기가 밀포하였다    ····································315. 무늬사초

11. 포의 밑은 열려 있고 과포에는 털과 맥이 없다  ·········································································316. 참삿갓사초

10. 성숙한 과포는 담녹색 또는 볏짚색이다.

12. 건조한 과포는 갈색이 도는 올리브색이며 끝이 둔하고 털이 없다.

13. 과포는 뒤로 젖혀지고 밑은 넓은 난형이며 주름이 지고 점차 좁아져서 부리로 된다  ·····························317. 삿갓사초

13. 과포는 비스듬히 서며 장타원상 난형으로 주름이 없고 좁아져서 부리로 된다    ·····································318. 햇사초

12. 건조한 과포는 볏짚색이다.

14. 과포의 부리가 길다.

15. 잎의 뒷면은 분백색이다.

16. 소수는 타원형이며 식물체는 가늘다  ···········································································319. 개찌버리사초

16. 소수는 원주형이고 식물체는 비교적 굵다    ···········································································320. 흰사초

15. 잎의 뒷면은 분백색이 아니다.

17. 소수는 꽃줄기끝에 모여 달린다    ··················································································321. 애기흰사초

17. 소수는 꽃줄기의 중앙 이상에 총상으로 달린다      ······························································ 322.그늘흰사초

14. 과포는 급히 좁아져서 부리가 짧다   ··························································································323. 골사초

9. 마른 과포는 검은 녹색 또는 검은 갈색으로 변하며 매우 부푼다.

18. 포영은 까락이 없고 과포는 다소 선다   ·························································································324. 염주사초

18. 포영은 까락이 길고 성숙한 과포는 벌어진다.

19. 과포의 부리는 길고 포영의 까락보다 길다   ·················································································325. 화살사초

19. 과포의 부리는 짧고 포영의 까락보다 짧다   ··············································································326. 흰꼬리사초

9. 과포는 곧추 또는 다소 서지만 말라도 검게 되지 않는다. 주맥 이외에는 맥이 없거나 희미한 맥이 있으며 소수는 꽃이 다소 성글거나 다소 배게 달린다.

20. 과포는 길이 5mm 이하로서 다소 갈색이 돌며 키는 25cm 이하이다.

21. 잎은 너비 1-4mm 이고 과포는 길이 2.5mm 이하이다 ······································································ 난쟁이사초

21. 잎은 너비 1 ~4 mm 이고 과포는 길이 3~5 mm 이다.

22. 정소수는 다음 소수의 키와 같거나 낮다 ··················································································327. 묏풀사초

22. 정소수는 다음 소수보다 높다 ·························································································328. 나도그늘사초

20. 과포는 길이 6mm 이상이며 연한 녹색이고 키는 30~70cm이다.

23. 소수는 선형이며 꽃이 성글게 달린다 ························································································329. 길뚝사초

23. 소수는 원주형이며 꽃은 배게 달린다.

24. 소수는 1마디에 1개씩 달려서 총상이 되고 과포는 2 개의 능선 외에는 맥이없다.

25. 잎은 너비 3~4mm이고 소수는 길이 3~6cm이다 ··································································· 330. 일본사초

25. 잎은 너비 2~3mm이고 소수는 길이 2~4cm이다 ··································································· 331. 무산사초

24. 소수는 1마디에서 2개이상 돋아서 다발형이며 과포에 맥이 많다 ················································· 332. 흰이삭사초