팥속 Phaseolus LINN.

1. 꽃은 황색이다.

2. 원줄기는 곧추 서거나 또는 비스듬히 선다.

3. 꼬투리에 털이 거의 없다 ················································································································· 938. 팔

3. 꼬투리는 거센 털이 있어 거칠다 ······································································································ 939. 녹두

2. 원줄기는 덩굴성이다.

4. 소포는 난형이며 맥이 많다 ············································································································· 940. 새팔

4. 소포는 선형이며 맥은 1 개이다 ······································································································ 941. 덩굴팔

1. 꽃은 백색 또는 적색이다

5. 소엽은 길이 10cm 이다 ············································································································ 942. 덩굴강낭콤

5. 소엽은 길이 4-7 cm 이다 ········································································································· 943. 붉은강낭콩