돌나물과 Crassulaceae

1. 심피는 합생， 즉 붙어 있다 ·········································································································· 601. 낙지다리

1. 심피는 이생， 즉 떨어져 있고 식물체는 육질이다.

2. 수술은 3~5 개이며 다른 꽃부분의 수와 같다 ···················································································602. 대구돌나물

2. 수술은 8~10 개이며 다른 꽃부분의 2 배수이다.

3. 꽃잎은 중앙 또는 그 이상까지 붙어 있다 ··························································································· 바위솔속

3. 꽃잎은 완전히 딸어져 있거나 어느 정도 떨어져 있다.

4. 뿌리는 초질이다  ···················································································································· 기린초속

4. 뿌리는 목질이다  ························································································································돌꽃속