상사화속 Lycoris HERB.

1. 화피는 방사대칭이며 포는 길이 3-4.5 cm 이고 화피는 너비 7~11mm 이다 ·······················································636. 백양꽃

1. 화피는 좌우대칭이다.

2. 화피는 황색， 황백색 또는 백색이다

3. 화피 가정자리는 파상이며 뒤로 젖혀진다 .···································································634. 개상사화 (붉노랑상사화)

3. 화피 가장자리는 밋밋하고 뒤로 말리지 않는다

4. 회피는 황백색 또는 황색이고 화피 통부는 길이 1.1 ~2.2 cm이며 암술대는 길이 10cm 미만이다.

5. 화피는 황백색이고 길이 59~67mm 이다 ··················································································635. 흰상사화

5. 화피는 황백색이고 길이 53-58mm이다 ·································································634. 개상사화(붉노항상사화)

4. 화피는 담자색이고 화피 통부는 길이 24~32mm이며 암술대는 길이 10cm 이상이다 ····································638. 상사화

2. 화피는 붉으며 잎은 짙은 녹색이고 주맥을 따라 흰 줄이 있다   ········································································637. 석산