국화속 Chrysanthemum LINN.

1. 재배식물이다

2.  729. 쑥갓

2.   730. 국화

1. 야생화이다.

3. 지하경이 벋어가며 종자는 젖어도 점질이 없다   ····················································································731.키큰산국

3. 지하경이 없으며 종자가 젖으면 점질이 나온다.

4. 총포의 너비는 5mm이며 설상화는 없고 통화 끝은 5개로 갈라진다   ···························································732. 솔인진

4. 설상화가 있다.

5. 두화의 지름은 3cm 이상이다.

6. 잎은 가장자리가 일부 갈라지거나 갈라지지 않으며 톱니형이다   ·····················································733. 서흥구절초

6. 잎은 대개 깊게 또는 잘게 갈라진다.

7. 식물체에 털이 거의 없다

8. 잎은 두껍고 윤채가 난다 ······························································································· 736+. 울릉국화

8. 잎은 그다지 두껍지 않으며 잎은 잘고 깊게 갈라지며 꽃이 달라지 않은 줄기는 끝에서 잎이 총생한다 ····734. 포천구절초

7. 식물체에 털이 다소 있거나 또는 많다.

9. 잎은 잘게 갈라지고 경엽에 흰 털이 있다    ·········································································735. 바위구절초

9. 잎의 측열편은 흔히 4 개로 갈라지고 열편 가장자리는 톱니같이 갈라진다   ········································736. 구절초

5. 두화는 지름 3cm 이하이다.

10. 두화는 지름 2.5 cm 이다   ········································································································737+. 감국

10. 두화는 지름 1.5 cm 이다    ········································································································737. 산국