석송과 Lycopodiaceae

석송속 Lycopodium LINN.

1. 원줄기와 가지의 구별이 없다.

2. 잎은 불규칙한 톱니가 있다 ··············································································································· 2. 뱀톱

2. 톱니가 없다.

3. 지상에서 자라며 윗부분에 살눈이 달린다.

4. 잎은 좁은 피침형이며 밑에 중앙까지는 좁아지지 않는다  ······························································3. 좀다람쥐꼬리

4. 잎은 뾰족한 피침형이며 밑에서부터 좁아진다    ···········································································4. 다람쥐꼬리

3. 수피와 암벽에 붙어서 자라며 살눈이 없다.

5. 식물체는 밑으로 처지고 잎은 2/3가 줄기에 붙는다  ············································································5. 줄석송

5. 식물체는 위를 향하고 잎은 밑에서 붙는다 ················································································6. 왕다람쥐꼬리

1. 원줄기와 가지의 구별이 있다.

6. 잎은 여러 줄로 배열하며 거의 비슷하게 생기고 밑이 좁아진다.

7. 원줄기는 땅속으로 범어가고 가지가 곧추서며 포자낭 이삭은 없다 ··························································7. 만년석송

7. 원줄기는 지면으로 벋어가고 가지는 비스듬히 선다.

8. 포자낭 이삭은 대가 있고 곁가지는 다시 갈라진다 ·················································································8. 석송

8. 포자낭 이삭은 대가 없고 곁가지는 그다지 갈라지지 않는다   ·································································9. 개석송

6. 잎은 4줄로 배열하며 어느 정도 2개의 형태를 보이며 밑이 다소 넓다.

9. 가지는 다소 편평하며 복면의 잎이 측면의 잎보다 다소 작다 ····································································10. 산석송

9. 가지는 매우 편평하고 복면의 잎이 측면의 것보다 훨씬 작다  ··································································11. 비늘석송