GRASSES OF BRITAIN. 159 



Setaria viridis the involuo'ol bristles are about thi*ee times the length 

 of the spikelet, with the teeth directed upwards. 



It is probable that this grass was introduced into Britain through 

 human agency, and therefore cannot be considered as a true native. 

 It is metwith occasionally in Middlesex andl^orfolkin cultivated fields. 

 It is a native of France, Holland, Belgium, Germany, Switzerland, 

 Italy, North Afi'ica, Asia, and the United States. Of no agricul- 

 tural use. 



Flowers in July and August, and ripens its seed in about the end 

 of September. 



The accompanying figure was taken from a specimen gathered in 

 Norfolk. 



Explanation of Plate LXIX. Setaria verticiUata, natural size. 



Fig. 1. Rachis with the spikelets removed, leaving the rough bristles. Natural size, 



2. Spikelet showing the stout bristles with reflexed teeth. 'I 



3. Glumes very unequal 



4. Lowermost floret of one palea. 



5. Upper floret of two pales. * 

 C. Ovarium, pistils, and stamens. ] " 

 7. Ligule of upper sheath. ) 



