장구채속 Melandryum FRIES

1. 1~2년초이다.

2. 꽃은 밤에 핀다 ·····················································································································337. 말냉이장구채

2. 꽃은 낮에 핀다.

3. 식물체에 거의 털이 없다 ··············································································································338. 장구채

3. 식물체에 털이 많다.

4. 곧추 자란다.

5. 소화경은 대개 벌어지지 않는다   ·························································································336. 애기장구채

5. 소화경은 옆으로 벌어진다 ····································································································339. 갯장구채

4. 식물체는 비스듬히 자라거나 엉킨다 ························································································340. 가는장구채

1. 다년초이다.

6. 꽃차례는 산형이고 꽃받침에 퍼진 선모가 있다 ·················································································341. 명천장구채

6. 꽃차례는 두상이며 식물체에 꼬부라진 털이 있다  ·············································································342. 분홍장구채