점나도나물속 Cerastium LINN.

1. 꽃잎은 갈라진다

2. 꽃잎과 꽃받침의 길이는 비슷하다.

3. 소화경은 꽃받침보다 길고 선모와 털이 다소 적다 ·········································································314. 점나도나물

3. 소화경은 꽃받침보다 짧거나 같다. 선모와 퍼진 털이 밀생한다    ················································314+. 유럽점나도나물

2. 꽃잎은 꽃받침 길이의 1.5~2.5배이며 종자에 젖꼭지 같은 돌기가 있다.

4. 종자는 지름 1 ~1.2mm이며 식물체는 털이 많고 해안성이다 ·························································315. 큰점나도나물

4. 털이 없고 종자는 지름 0.7~1mm이며 고산성이다··································································· 316. 북선점나도나물

1. 꽃잎은 갈라지지 않고 꽃받침 길이의 2.5~3배이다. 열매의 열편은 밖으로 말린다 ···································· 317. 털점나도나무