대극과 Euphorbiaceae

1. 밑씨는 각 실에 1 개씩 들어 있으며 유관이 없는 것이 있고 골 속에 사관이 있는 것도 있다

2. 꽃차례의 일부가 술잔같이 생겼다 ············································································································대극속

2. 꽃차례의 일부가 술잔형으로 되지 않는다.

3. 수꽃은 꽃받침잎이 기왓장처럼 포개진다 ························································································사람주나무속

3. 수꽃의 꽃받침잎은 마주 닿는다.

4. 꽃부리가 있다 ············································································································· 유동나무속 Aleurites

4. 꽃부리가 없다.

5. 수술은 다수이며 수술대는 여러 개로 갈라지고 꽃밥은 다소 떨어져있다 ·································· 1038. 피마자(아주까리)

5. 수술은 다수 또는 소수이며 떨어졌거나 불어있다.

6. 꽃밥은 원주상 장타원형이며 흔히 꼬부라진다 ············································································· 1037. 깨풀

6. 꽃밥은 구형 또는 장타원형이다.

7. 꽃밥은 장타원형이고 수술은 많다 ··················································································· 1030. 예덕나무

7. 꽃밥은 다소 둥글다 ······································································································· 1039. 산쪽풀

1. 밑씨는 각 실에 2 개씩 들어 있으며 유관이 없고 골속에 사관이 없다.

8. 초본이며 수꽃에 씨방이 흔적이 없다 ·································································································· 여우구슬속

8. 관목이며 수꽃에 씨방의 흔적이 뚜렷하다 ······················································································· 1032. 광대싸리