140 



WEEDS OF THE FARM AND GARDEN 



than those of finger grass ; first glume very minute, second 

 and third larger and nearly of equal length, or the second 

 a little shorter than the fourth, the upper empty glume 

 equaling the flower. The blooming period from June to 

 September. Quite common in eastern and central Iowa, 



Fig. 89. Smooth crab grass (Digitaria humifusa). (U. S. Dept. 

 Agrl.) 



