억새속 Miscanthus ANDERSS·

1. 기모는 은백색이며 소수 길이의 2-4 배이다 ····························································································· 55. 물억새

1. 기모는 소수 길이와 비슷하거나 짧다.

2. 기모는 소수보다 약간 길거나 짧다.

3. 기모는 황갈색이다 ························································································································ 56. 억새

3. 가모는 자줏빛이다  ······················································································································  자주억새

2. 기모는 소수 길이의 2/3 정도이다   ·································································································57. 억새아재비