Appendix 191 



glume itself. Awn of the outer palea sub-terminal and variable in 

 length. 



It occurs in salt marshes on the south and east coasts of England. 



Polypogon monspeliensis, Desf. Annual Beard-grass. 



An annual growing from twelve to eighteen inches high. Panicle 

 erect, dense, interrupted and silky; about two inches long. Empty 

 glumes hairy, strongly toothed on the lower half of their keels, and 

 each bearing an awn more than twice as long as the glumes. Outer 

 palea bearing a short awn. 



Common in the Mediterranean region. Rare in Britain. Occa- 

 sionally found as an introduced plant in the south of England. 



Setaria, Beauv. Bristle-grass. 



General characters of the genus : 



Spikelets 1 — 2-flowered, ovate, in a close, cylindrical or bushy panicle. 

 Empty glumes awnless, the lowermost one short. Palese blunt, becoming 

 hard and shining or transversely wrinkled when the grain ripens. Invo- 

 lucral bristles rough, and generally projecting beyond the spikelets. 



Setaria glaitca, Beauv. Glaucous Bristle-grass. 



An erect annual, with a panicle from 1 to 1J inches long, and numerous 

 bristles under each spikelet. Bristles rough with minute erect teeth. The 

 outer palea marked with numerous strong transverse wrinkles when ripe. 



Abundant as a weed of cultivation in most warm countries, and 

 occasionally introduced into Britain. 



Setaria verticillata, Beauv. Reflex Bristle-grass. 



An erect annual, one to two feet high. It is readily distinguished 

 from S. glauca and *S. viridis by the reflexed teeth on the bristles. Some- 

 times met with as a weed of cultivation in England. 



Setaria viridis, Beauv. Green Bristle-grass. 



Very similar to S. glauca but with only 2 — 3 bristles under each spikelet. 

 The transverse wrinkles on the outer palea are also much less distinct. 

 Introduced into Britain and appears to be established in some parts. 



Spartina slricla, Sm. Cord-grass. 



A stiff erect perennial with creeping rhizomes. Leaves erect, 

 mostly inrolled. Culms from one to two feet high. The inflorescence 

 consists of from two to four spike-like branches each three or four 

 inches long. Spikelets one-flowered, compressed, erect, awnless, and 

 sessile ; situated on one side of the spike-like branches. Empty glumes 

 very unequal, hairy. The inner palea is longer than the outer one. 



Found on some of the salt marshes on the south and east coasts of 

 England. 



