20 



WEED FLORA OF IOWA 



NAT0BAL CONDITION 



WATEB FEEB SUBSTANCE 



2.65 10.53 (9.86) 35.30 14.49 37.13 



PRESH OB AIB DBT SUBSTANCE 



WATER EREE SUBSTANCE 



S. D. (1): 

 Aug. 8, 1898 



Tenn. (2) 



Washington, D, C. (3): 

 Cut July 1, very young 

 Cut • July 24, early 



bloom 



Mississippi 



14.59 

 9.04 



10.80 



7.30 

 16.74 



2.30 



2.70 

 2.71 



34.03 

 32.82 



21.70 



26.80 

 86.04 



11.47 

 5.16 



17.00 



9.00 

 9.20 



37.86 

 49.06 



48.10 



65.30 

 34.31 



Green Foxtail {Setaria viridis (L.) Beauv.). 



Description. — An erect annual from 1-3 ft. high ; leaves 4-12 in. 

 long, with rough margins; greenish, more or less compound cyl- 

 indrical spikes from 1-5, or even in some cases 6 in. long; bristles 

 few, much longer than the spikelets ; spikelets 1/2 in. long, the chaff 

 of second and third glumes as long as the minute chaff of the 

 fourth glume, the latter being dotted and striate. A single head 

 produces an enormous number of seeds. 



Distribution.— This European grass is common in North Amer- 

 ica, especially eastward. It is found everywhere in the state, more 

 particularly in corn fields, gardens, and in vacant places. 



Extermination.— The same method of extermination should be 

 used for this weed as for pigeon grass. 



