개억새속 Eularia KUNTH

1. 밑부분의 잎집은 황색 털로 덮이고 잎에 거의 털이 없다················································································ 63. 개억새

1. 밑부분의 잎집은 털이 없다. 잎에 흰 털이 있다·······················································································  62. 털개억새