박주가리과 Asclepiadaceae

1. 화분괴는 곧추선다.

2. 잎은 굳으며 화분괴는 작고 원판 같다 ··························································································153. 왜박주가리

2 잎은 초질이며 화분괴는 크고 서양배같이 생겼다··············································································154. 나도은조롱

1. 화분괴는 줄에 매달려 있다

3. 꽃은 산형으로 배열하며 부화관은 수술과 합생한 씨방의 길이와 같거나 길다 ····················································· 백미꽃속

3. 꽃은 총상으로 배열하며 부화관은 수술과 합생한 씨방 길이의 반밖에 안 된다  ·············································142. 박주가리

백미꽃속 Cynanchum LINN.

1. 잎은 대생한다.

2. 잎은 난심형이며 덩굴성이고 뿌리는 길게 옆으로 지란다  ·········································································143. 큰조롱

2. 잎은 피침형 또는 타원형이며 근경은 짧고 뿌리는 길다.

3. 줄기는 곧추 비스듬히 자라며 잎은 좁은 피침형이고 꽃은 황색이다 ··························································144. 산해박

3. 잎은 두껍고 넓다.

4. 잎자루는 짧고 줄기를 감싼다 ··································································································145. 솜아마존

4. 잎자루는 다소 길고 줍기를 감싸지 않는다.

5. 줄기는 곧추서지만 위끝이 짧은 덩굴로 된다.

6. 꽃부리는 겉에 털이 있고 안쪽에 털이 없으며 잎은 뒷면에 짧은 털이 밀생한다  ····································146. 백미꽃

6. 꽃부리는 털이 없거나 맥상에 털이 있다.

7. 잎은 다소 두껍다 ···································································································· 147. 덩굴민백미꽃

7. 잎은 약간 두꺼운 막질이다.

8. 꽃차례는 꽃자루가 있고 소화경은 길이 2cm이며 꽃은 지름 2cm이다  ········································ 148. 민백미꽃

8. 꽃차례는 보통 잎겨드랑이에 달리며 꽃자루와 소화경이 짧고 꽃은 지름 7mm 정도이다  ··················· 149. 선백미꽃

5. 줄기는 덩굴성이다.

9. 꽃부리 열편에 털이 없다 ······························································································150. 덩굴박주가리

9. 꽃부리 열편의 안쪽에 잔털이 밀생한다 ················································································152. 세포큰조롱

1. 잎은 밑에서는 호생하고 위에서는 총생하며 선형이다 ··················································································151. 양반풀