실새풀속 Calamagrostis ADANSON

1. 기모는 소화보다 길다

2. 포영은 길이가 거의 같아 6rnrn 이다    ································································································202. 산조풀

2. 포영은 둘째 포영이 첫째 포영보다 길며 길이 5mm 정도이다  ·····································································203. 갯조풀

1. 기모는 소화보다 짧거나 같다.

3. 기모는 호영 길이의 2/3 미만이며 까락은 호영보다 길고 꺾어졌다   ······························································204. 실새풀

3. 기모와 호영의 길이는 비슷하다.

4. 까락은 호영의 3/4 높이에서 돋는다   ·····························································································205. 낭림새풀

4. 까락은 앞과 같지 않다.

5. 잎혀는 길이 2~4mm이고 기모는 호영보다 약간 짧다     ······································································206. 야지피

5. 잎혀는 길이 3.5mm 이상이다.

6. 잎혀는 길이 1-3.5mm이고 까락은 호영 중앙에서 돋는다   ······························································207. 백산새풀

6. 잎혀는 길이 6~8mm 이고 까락은 호영의 밑부분에서 돋으며 호영보다 길다.

7. 가지가 없다  ·····················································································································208. 산새풀

7. 가지가 있다 ················································································································ 208+. 큰산새풀