비름과 Amaranthaceae

1. 잎은 호생한다.

2. 꽃은 양성이며 수술대는 밑에서 붙었다 ································································································맨드라미속

2. 꽃은 단성이며 수술대는 떨어져있다   ······································································································ 비름속

1. 잎은 대생한다.

3. 암술머리는 갈라지지 않는다 ·········································································································· 283. 쇠무릎

3. 암술머리는 2 개로 갈라진다 ·········································································································· 284. 천일홍