① 맥문동아과 Ophiopogonoideae

1. 씨방상위이며 수술대가 뚜렷하고 꽃밥은 끝이 둔하며 종자는 자흑색이다.

2. 잎은 너비 4-12mm 이다.

3. 잎은 너비 8~12mm 이고 옆으로 뻗어가는 가지가 없으며 꽃은 조밀하게 달린다  ·········································518. 맥문동

3. 잎은 너비 4~7mm 이고 옆으로 뻗어가는 가지가 있으며 꽃은 다소 성글게 달린다 ·····································519. 개맥문동

2. 잎은 너비 2~3mm 이며 옆으로 뻗어가는 가지가 있다 ··············································································애기맥문동

1. 씨방중위이며 수술대는 짧고 꽃밥은 끝이 뾰족하며 종자는 하늘색이다.

4. 잎은 너비 7~15mm이고 꽃줄기는 길이 12~15mm이며 뻗어가는가지는 없다     ·········································520. 맥문아재비

4. 잎은 너비 2~4mm이고 잎의 잔톱니는 뚜렷하며 많다   ······································································521. 소엽맥문동