봉의꼬리속 Pteris LINN.

1. 정우편은 갈라지지 않았다

2. 정우편의 밑은 중축으로 흐른다. 나우편의 너비는 6~12mm 이다     ··························································56. 봉의꼬리

2. 정우편의 밑은 흐르지 않는다. 나우편의 너비는 10~25mm 이다    ·························································57. 큰봉의꼬리

1. 정우편은 깃처럼 갈라진다.

3. 중축과 소우축 표면의 열편 기부에 잔가시가 없다 ············································································· 58. 반쪽고사리

3. 중축 및 소우축 표면의 열편 기부에 잔가시가 1 개 있다  ··································································· 59. 큰반쪽고사리