다닥냉이속 Lepidium LINN.

1. 위쪽 잎은 줄기를 감싼다 ··········································································································· 547. 대부도냉이

1. 잎은 줄기를 감싸지 않는다.

2. 수술은 6개이며 각과는 날개가 있고 길이 5~6mm 이며 꽃자루는 비스듬히 위를 향한다 ····························· 544. 큰다닥냉이

2. 수술은 2개이나 간혹 4개이며 각과는 길이 2~4mm 이고 대개 날개가 없으며 꽃자루는 옆으로퍼진다.

3. 꽃잎의 길이는 꽃받침의 길이와 같거나 길며 각과는 길이 2.5~ 4mm 이다 ············································ 545. 콩다닥냉이

3. 꽃잎은 없거나 꽃받침보다 짧으며 각과는 길이 2~3mm이다  ······························································546.  다닥냉이