작약속 Paeonia LINN.

1. 초본으로 화반은 높지 않다.

2. 소엽 밑은 흐르지 않고 잎은 윤채가 없으며 뒷면은 흰빛이 돈다.

3. 꽃은 희며 암술머리는 짧고 약간 밖으로 굽었다. 잎은 뒷면에 털이 없고 열매는 뒤로 젖혀졌다   ························465. 백작약

3. 꽃은 연한홍색이며 암술머리는 다소 길고 꼬였다. 잎은 뒷면에 대개 털이 있으며 골돌은 퍼졌다   ···················· 465+. 산작약

2. 소엽 밑은 흐르고 잎은 윤채가 나며 뒷면은 담녹색이고 꽃이 크다 ······························································466. 적작약

1. 관목으로 화반은 커져서 심피를 감싸고 있다  ····························································································467. 모란