별꽃속 Stellaria LINN.

1. 밑부분의 잎은 잎자루가 있다.

2. 암술대는 5개이며 삭과는 5개로 갈라진다  ·························································································· 318. 쇠별꽃

2. 암술대는 3개이며 삭과는 6개로 갈라진다 ····························································································· 319. 별꽃

1. 잎은 잎자루가 없다.

3. 꽃잎은 2 개씩 감라진다.

4. 잎은 선형 또는 넓은 선형이며 너비 1 ~2.5mm 이다.

5. 줄기에 작은 돌기가 있으며 꽃잎은 꽃받침보다 길거나 같다   ·····························································320. 긴잎별꽃

5. 줄기는 밋밋하고 꽃잎은 꽃받침 길이의 1.5~2 배이다   ······································································321. 실별꽃

4. 잎은 타원형 또는 난상 피침형이며 너비 2.5~4mm 이다   ···································································322. 벼룩나물

3. 꽃잎은 여러 개로 갈라지고 식물체에 누운 털이 있다  ·················································································323. 왕별꽃