싱아속 Aconogonum REICHENB.

1. 잎자루가 거의 없거나 없다.

2. 잎자루가 없다. 수과는 길이 3-3.5mm 이다   ···················································································203. 긴개싱아

2. 밑부분의 잎은 다소 잎자루가 있다. 화피는 길이 3mm, 수과는 길이 6mm이다  ·········································· 204. 왜개싱아

1. 잎자루가 있다.

3. 환절은 소화경의 중간 이하에 있다. 수과는 길이 3mm, 화피는길이 2.5mm 이다  ····································· 206. 얇은개싱아

3. 환절은 소화경 상부에 있다.

4. 수과는 길이 3mm, 화피는 길이 1.5 mm 이다   ·············································································· 205. 참개싱아

4. 수과는 길이 5mm 정도이다   ········································································································ 207. 싱아