배추속 Brassica LINN

1. 잎은 분백색이 돈다.

2. 잎은 포개져서 둥글게 된다  ··········································································································· 543. 양배추

2. 잎은 말리지 않는다  ······················································································································ 540. 유채

1. 잎은 분백색이 아니다.

3. 잎은 타원형이며 주맥은 정상적인 크기이고 잎자루에 엽편이 달린 것도 있다 ······················································ 542. 갓

3. 잎은 도란형이며 주맥은 희고 넓으며 뒤로 튀어나왔다  ··············································································541. 배추