152 TRIANDRIA. DIGYNIA. holcos. 



hairy and ciliate ; the superior narrower and shorter than the 

 inferior, 3-nerved. Valves of the perfect floret nearly equal, 

 smooth ; the inferior one broader. Antheriftrous floret with 

 the superior valve shorter ; the inferior armed on the back 

 about a third of the way down. 

 Hab. In wet meadows. June. Doubtless introduced from 

 Europe. 



51. SETARIA P. deBeauv, 



Spikelets surrounded by an involucrum of 2 or more 

 bristles. Calijx 2-flo wered ; glumes unequal , herbace- 

 ous. Inferior floret abortive, 1-2-valved herbaceous. 

 Superior floret perfect, glumes cartilaginous. P. de 

 Beanv. Agrost. p. 51. t. XIII. f. 3. Roem. ^ 

 Sc/iult. Gen. 212. Tr in. Agrost. U^. Penni- 

 SETUM Nutt. Gen. I. p. 54._ Panic i spp. L. In- 

 floresence a compound cylindrical spike. 



1 . S. viridis P. de B. : spike cylindrical ; involucrum of 

 4-10 fasciculate bristles, scabrous upward; spikelets gemi- 

 nate : perfect floret smooth ; sheaths pubescent. Roem. 4^ 

 Schult. II. p. 488. Panicum vinde L. Willd. Spec, 

 1. p. 335. Pursh FL\.p.G6. M u h I. Gram. ip. 102. 



Root annual. Culm a foot and a half or two feet high, simple. 

 JLcat'cs flat, smooth. i?ac/ijs sulcate below the spike. Bristles 

 of the invotucrujn longer than the flowers. Inferior glume 3- 

 nerved ; superior 5-nerved, smooth. Abortive floret 2-valved, 

 neuter; superior valve very minute, bifid. Valves of the 

 perfect floret puncticulate, not rugose. 



Hab. In cultivated grounds ; rare. July— August. Introduced 

 from Europe, as are all the following. Wild Timothy. 



Bottle Grass. 



2. S. glauca P de B. : spike cylindrical ; involucrum of 

 many fascicled bristles, scabrous upward ; perfect floret 

 transversely rugose. R o em. ^r S c hult.W.^. 490. Pani- 

 cum glaucum. L. Willd. Spec. 1. p. 335. Mich. Fl, L 

 p. 4G. Big. Post. ^. \^. Pursh FL].T^.66. Elliott 

 Sk. I. p. 112. MuhL Gram. p. 100. P. alopecuroideum 

 Walt. Car. p. 72. 



Root annual. Culm about 2 feet high. Leaves somewhat hairy. 

 Spike 3-4 inches long. Involucrum of from 6 to 10 scabrous 

 bristles, much longer than the spikelets, becoming yellowish 

 when old. Abortive floret 2-valved ; superior valve very mi- 

 nute, bifid. Valves of the perfect floret crossed by undulate 

 wrinkles. 



Hab. In fields and cultivated grounds. July— August. Intro- 

 duced. JBottle Grass. 



