구와말속 Limmophila R. B_R.

1. 잎은 대생하며 톱니가 있다 ···········································································································311. 소엽풀

1. 잎은 윤생하며 깃처럼 갈라지고 다년초이다.

2. 줄기와 꽃받침 밑부분에 털이 있다 ································································································309. 구와말

2. 줄기와 꽃받침에 털이 없다 ······································································································310. 민구와말