CLASSIFICATION. 



107 



from the Cynodon Dactylon, which it greatly resembles, 



by its spikelets being flattened at the back, and placed 



on the rachis in twos and 



threes, whilst in the Cynodon 



they are placed singly on 



the rachis, and are flattened 



at the side only. From the 



Panicum sanguinale it is 



distinguished, as we have 



already seen, by the equality 



of the second and third 



empty glume. 



Like the last species, this 

 is a mere weed; it affects 

 cooler climates than P. san- 

 guinale, but no use is as- 

 cribed to it. It flowers from July to the end of August. 



3. Panicum verticillatum. Rough Panicum. 



(Setaria, Brit. FL) 



Boot annual, fibrous; stems numerous, straight, but 

 spreading, often branched at the base, smooth on the lower 

 part but rough above, leafy ; leaves harsh, straight, pointed, 

 lanceolate, very rough at the edges; sheaths smooth, stri- 

 ated, the uppermost one shorter than the leaf; ligules 

 fringed, short, and blunt ; panicle simple, the branches 

 short, and placed in whorls, rough ; the spikelets are flat- 

 tened at the back, stalkless, and placed in clusters generally 

 of four, amongst these numerous bristles arise, which are 

 called by Mr. Curtis the involucrum of the spikelet ; the 

 bristles are long and closely beset with teeth pointing down- 

 wards; the first empty glume is very small, broad, and 



