기장속 Panicum LINN.

1. 잎은 너비 4~15mm이고 소수는 길이 2-2.5 mm이다.

2. 소수는 길이 1.8-2mm이고 잎은 너비 4-10mm이다 ··················································································88. 개기장

2. 소수는 길이 2.5 cm이고 잎은 너비 8-15mm이다  ··············································································90. 미국개기장

1. 잎은 너비 2cm 이상이고 소수는 길이 5mm 이며 재배식물이다   ·······································································89. 기장