비비추속 Hosta TRATTIN.

1. 꽃의 길이는 10cm 이상이고 수술과 화피의 밑부분이 붙어 있다 ···································································573. 옥잠화

1. 꽃의 길이는 5cm 이하이고 수술과 회피의 밑부분이 떨어져 있다.

2. 포는 편평하거나 기부만이 오목하고 꽃이 피기 전에 퍼진다.

3. 광통부가 좁고 종모양 비슷한 깔때기형이며 투명선이 분명하지 않고 좁은 통부에 흠이없다. 잎이 지면에 깔리고 잎자루에 날개가 있다.

4. 잎은 너비 15~20cm이고 엽맥은 13~14쌍이며 포는 두껍고 꽃이 진 다음에도 남아있다 ·································· 큰비비추

4. 잎은 너비 7-10cm이고 엽맥은 7-9쌍이며 포는 꽃이 진 다음에 시든다 ·················································· 574. 비비추

3. 광통부가 갑자기 넓어져서 도원추형이 되고 투명선이 뚜렷하며 가끔 골이 생기고 좁은 통부에 흠이 있다.

5. 엽맥은 4~5쌍이고 화피 열편이 퍼지지 않는다 ··············································································575. 참비비추

5. 엽맥은 6~7쌍이고 화피 열편이 퍼진다       ················································································576. 주걱비비추

2. 포는 보트형이고 꽃봉오리일 때 섭합상이다.

6. 꽃줄기는 속이 비었으며 꽃차례는 수상이다  ························································································한라비비추

6. 꽃줄기는 충실하다.

7. 꽃이 피기 전에는 포가 밀착하여 둥글다 ····················································································577. 일월비비추

7. 어린 꽃차례는 둥글지 않다

8. 잎은 길이 17cm 이하이고 꽃줄기는 자줏빛이 돌지 않는다  ·····························································578. 좀비비추

8. 잎은 길이 18cm 이상이고 꽃줄기는 자줏빛이 돈다    ·····································································579. 산옥잠화