삼잎국화속 Rudbeckia LINN.

1. 잎은 갈라지지 않는다 ·················································································································680. 원추천인국

1. 잎은 3~7 개로 갈라진다.

2. 꽃잎은 외첩이다 ·······················································································································679. 삼잎국화

2. 꽃잎은 만첩(여러 겹)이다 ······································································································ 679+. 만첩삼잎국화