100 SETARIA VERTICILLATA. 



compressed, almost sessile, clustered, having involucral bristles 

 longer than the spikelets, and each strongly dentate, the teeth 

 pointing downwards. Glumes very unequal, two. Upper floret 

 of two palese. Styles two. Stigmas short and plumose. Stamens 

 three. Anthers deep purple in colour. Seeds shining and hard. 

 Length from six, to twenty-four inches. Root annual and fibrous. 



The involucral bristles are much larger in Setaria viridis. 



Flowers in July, and seeds ripen toward the close of September. 



The specimen for illustration was gathered in Battersea Fields, 

 by Mr. J. Sidebotham, of Manchester. 



