156 100. Digitaria. 10. GRAMINEiE. Pl.end.pk. 



Fields ; annual ; July and August. 



Culm lying down, brancliy, smooth, joints villous; leaves 

 smoothish, 7 or 9-ribbed,- sheaths broad, often spotted; 

 ligula very short, fringed ; spikelets 1 -sided ; peduncles 

 short, 2-flowered, one nearly sessile ; locustce green or 

 purple. 



2. BigUana glabra. Bald fingers. 



Spikelets mostly in pairs ; inner knotted and forked at 

 bottom ; locustm ovate ; spathelles nearly equal ; sheaths 

 and leaves bald. . 



Panicum filiforme, Jacqnin Obs, 3, 70. 

 Digitaria fiiifomiis, Koel. Gram. 86. 

 Paspaluin am])iguiim, De Cand. Syn, Fl, Gall. 1505 

 Sjntherisma glabriim, Schrad, Germ. 1, 163. 

 Pauicum geminatum, Gaud, in Seringe Cat. 8. 

 Panicum giabruin, Gaud. Agr. Helv, 1 , 23. 



Sandy fields ; annual ; July and August. 



Culms in tufts, smooth, shining ; leaves short, soft, bald ; 

 ligula short, torn ; spikelets facing one way; rachis flexuous; 

 peduncles very short, 2-flowered ; knots at the bottom sub- 

 pellucid. 



LX. 101. SETARIA. Bcauvois. Bristlegrass. 



Spathelles alternate, lower very small; spathellules leathery, 

 hardened ; lower spathellide pointed ; lower flowret neuter 

 or male ; lodicide very blunt, almost sickleshaped ; ovary 

 nicked ; stigmata aspergilliform ; cariopsis free, enclosed 

 in the persistent spathellules. — Panicle siinple, spikeshape ; 

 locustce involucrated with 2 or more bristles. 



1. Setaria verticillata. IVhorled Iristlegrass. 



Locustce in v/horls, by fours ; involucrum 1 -flowered, 

 2-bristled ; cidm diffused ; bristles rough with reflexcd 

 tecih ; cariopsides smoothish. 



Gramcn paniceum spictl aspera, Raii Syn. 394,3. 

 Panicum verticillatum, Lin. S. P. 82. 

 Ppiinisetum verticillatum, Bmwn Prod. 

 Setaria verticillata, Pal. de Beauv. 



Corn fields ; annual ; August and Septembcj*. 



Root fibrous; culm branchy, ascending, rather compressed, 

 bald, prickly above; leaves broad, 9-ribbed, bald; slwaths 

 smoothish; ligula hairy; panicle gi'cen, with whorls at 

 hitervals at bottom ; locustiv smoothish. 



^. Ireviseta. Bristles of the involucrum short, and 

 scarcely longer than the locustas. 



