골풀속 Juncus LINN.

1. 꽃에 소포가 있다.

2. 꽃줄기의 잎은 편평하고 윗면이 오목하며 꽃차례는 정생한다.

3. 1 년초로서 열매는 3 실이다   ····································································································492. 애기골풀

3. 다년초로서 열매는 1 실이고 격막이 3 개 있다.

4. 화피 열편은 둔두이며 열매보다 짧다   ·························································································493. 물골풀

4. 화피 열편은 예두이며 열매보다 길다 ···························································································494. 길골풀

2. 꽃줄기의 잎은 비늘같이 작고 첫째 포는 꽃줄기의 연장같이 보인다.

5. 열매는 3 실이며 녹갈색이고 수술은 3 개이다 ······················································································495. 골풀

5. 열매는 1 실이며 격막이 3 개 있다.

6. 수술은 6 개이고 열매는 갈색 또는 흑갈색이다.

7. 지하경이 가늘고 마디사이가 짧으며 열매는 갈색이다 ····································································496. 참골풀

7. 지하경은 굵고 마디사이가 굵으며 열매는 다갈색 내지 흑갈색이며 길이 5~6 mm 이다 ·····························497. 갯골풀

6. 수술은 3 개이고 열매는 연한 황갈색이다 ·················································································498. 푸른갯골풀

1. 꽃에 소포가 없다.

8. 꽃차례는 1 개의 두상화서로 되어 있다.

9. 고산 자갈밭에서 자란다. 잎은 침모양이며 꽃줄기보다 짧다 ··································································499. 구름골풀

9. 깊은 산 암벽에 붙어 있다. 잎은 편평하고 꽃줄기의 길이와 비슷하거나 길다.

10. 화피 열편은 선형이며 수술대는 화피보다 길다 ··········································································500. 실비녀골풀

10. 화피 열편은 좁은 피침형이며 수술대는 화피 열편보다 약간 짧다 ····················································501. 백두실골풀

8. 꽃차례는 많은 두상화서로 복화서이다.

11. 잎은 앞뒤로 편평하고 뚜렷한 잎귀는 없으며 포복지는 길고 두상화는 3~4개 이다   ···································502. 설령골풀

11. 잎은 원통형이고 좌우로 편평하며 잎귀가 있으며 보통 격막이 있다.

12. 줄기는 원통형이고 날개가 없으며 두상화서는 많은 꽃으로 되어 있다.

13. 잎은 둥글고 격막이 뚜렷하며 열매는 화피 열편보다 약간 길고 두상화서는 많은 꽃으로 되어 있다.

14. 수술은 6개이며 지하경은 길고 꽃줄기는 소생한다. 두상화서 변의 꽃은 위로 향한다   ·························503. 비녀골풀

14. 수술은 3 개이며 지하경은 짧고 줄기는 총생한다. 두상화서 변의 꽃은 옆 또는 밑을 향한다 ·················504. 눈비녀골풀

13. 잎은 편원형이며 격막이 없다. 줄기는 총생하고 열매는 화피 열편보다 훨씬 길며 두상화는 2~3 개의 꽃으로 되어있다 ······················ 505. 청비녀골풀

12. 줄기는 편평하고 잎은 좌우로 편평하며 다관질이다.

15. 수술은 6개이고 줄기에 넓은 날개가 있으며 잎은 너비 2~5nm이다 ················································· 506. 날개골풀

15. 수술은 3개이고 줄기의 날개는 극히 좁다.

16. 잎은 너비 2~5mm이고 꽃은 열매와 더불어 길이 5~6mm이며 열매는 점첨두이다  ···························507. 별날개골풀

16. 잎은 너비 2~3mm이고 꽃은 열매와 더불어 길이 4~5mm이며 열매는 급첨두이다 ·························· 508. 참비녀골풀