1) 쇠풀족 Andropogoneae

1. 소수(小穩)는 모두 같은 형태이다.

2. 소수는 1마디에 1 쌍씩 달린다

3. 꽃차례는 원추상이다

4. 소수는 수체보다 긴 흰 털로 싸여있다   ································································································ 54. 띠

4. 소수에는 수체보다 긴 털이 없다 ····································································································· 기름새속

3. 꽃차례는 방사상 또는 산방상으로 나열된 가지로 되어있다.

5. 꽃차례 분지는 관절에서 떨어지지 않고 쌍으로 된 소수는 모두 소수병 밑에서 떨어진다  ······································억새속

5. 꽃차례 분지는 관절에서 떨어지고 2 개의 소수 중 줄기가 없는 것은 화서지의 관절과 같이 떨어진다.

6. 줄기는 밑에서 곧추서고 잎은 길이 30 cm 이상이다 ·············································································개억새속

6. 줄기는 처음에는 옆으로 자라며 마디에서 뿌리가 내린다 ··································································민바랭이새속

2. 소수는 꽃차례 관절에 1 개씩 달린다 ·······························································································53. 잔디바랭이

1. 소수는 형태가 다르며 같을 때에는 화서지의 축이 굵어진다.

7. 화서지의 중축은 굵어지고 대가 없는 소수는 오목한 틈에 들어있다.

8. 꽃차례는 줄기의 옆과 끝에 달린다 ··································································································75. 쇠치기풀

8. 꽃차례는 줄기 끝에 달린다.

9. 화서지는 5 개 이상이 산방상으로 달린다  ·························································································74. 모새달

9. 화서지는 2 개가 밀착하여 1 개 같이 보인다 ·························································································쇠보리속

7. 화서지의 중축은 가늘며 소수 지름보다 가늘다.

10. 결실 소수의 첫째 포영은 초질이다.

11. 잎은 난형이며 1 년초이다 ··········································································································68. 조개풀

11. 잎은 좁고 길다.

12. 2개의 화서지 중에서 가장 밑의 1 쌍은 모두 웅성이다······································································ 69. 개솔새

12. 모든 소수쌍은 성이 다르다.

13. 꽃차례는 줄기 끝에 달리고 꽃차례를 싸는 포가 없다   ····························································· 66. 나도기름새

13. 꽃차례는 줄기 끝과 옆겨드랑이에 달리며 밑에 포가 있다   ·································································70. 쇠풀

10. 결실 소수의 첫째포는 혁질이다.

14. 꽃차례는 줄기 끝과 잎겨드랑이에 달린다  ··························································································71. 솔새

14. 꽃차례는 줄기 끝에만 달린다   ········································································································· 수수속

바랭이새속 Bothriochloa O. KUNIZE

1. 꽃대축은 편평하고 꽃차례가 갈리는 곳에 털이 있으며 잎은 너비 2-3mm이다 ················································· 67. 바랭이새

1. 꽃대축은 가늘고 갈리는 곳에 털이 있으며 잎은 너비 5-8mm 이다 ·····························································66. 나도기름새