망초속 Erigeron LINN.

1. 총포펀의 길이는 비슷하고 두화는 지름 3-4 cm로서 자주색이며 원줄기 끝에 1개가 달린다 ································ 632. 구름국화

1. 총포편 길이는 같지 않다.

2. 암꽃은 설상으로 퍼지고 설상부는 통부보다 길며 관모 밖으로 나왔다.

3. 설상화는 가늘고 설상화와 양성화 사이에 모관상 암꽃이 있으며 줄기는 적자색이 돈다 ····································633. 민망초

3. 설상화는 편평하고 모관상 암꽃이 없다  ····························································································634. 개망초

2. 암꽃은 좁은 통형이거나 짧은 설상이다.

4. 녹색 식물로서 총포는 길이 3mm 이고 두화는 지름 3mm 이다 ···································································· 635. 망초

4. 회록색 식불로서 총포는 길이 5mm 이고 잎은 좁으며 가장자리가 물결형이다  ·············································· 636. 실망초