5) 산기장족 Phaenospermeae

1. 소수는 1 개의 소화로 되어 있다   ·······································································································209. 산기장

1. 소수는 2~3 개의 소화로 되어 있다   ······································································································· 용수염속

용수염속 Diarrhena BEAUV.

1. 소수는 길이 5mm 이상이고 내영은 능선이 거칠다.

2. 소수는 길이 6mm이며 밑의 결실 호영은 길이 3.5~4.5mm이고 열매는 호영보다 길다   ································210. 광릉용수염

2. 소수는 길이 7-9mm 이며 결실 호영은 길이 4.5-5mm 이며 영과보다 길다   ··············································211. 껍질용수염

1. 소수는 길이 5mm 이하이고 내영 능선은 밋밋하다  ···················································································212. 용수염