150 I'AMCACK.E. 



furrow on each side. T nun. loii<r. lu'sides the burbcd points at tho 

 base and the awns above ; awns lU-'-iO mm. loiip:, ilnst and second 

 glumes T-nerved ()} nerves near the middle and 2 toward each ed<re) ; 

 third glume (lloral glume of the rudimentary lloret) delicately ')- 

 nerved; fertile lloret rough, elliptical, 5-0 mm. long, terminatiug 

 in a sluirt spine, the lloral glume 5-nerved. 



Mexico, J'dhnn' C>\\K Prinyle 2;{;31. 



:?(». (r*) ChamjerAPHIS K. Mr. Trod. 1:193 (1810). Svtaria 

 IVauv. Agrost. 11:5 (KSl:i), not Ach. (ITDS). 



Spikelets with one terminal perfect tlower, aiul a staminatt' or 

 neuter one below it, crowded into a cylindrical dense or soniotinies 

 interrupted spikelike panicle, awnless, articulate with the pedicel, 

 sonu> or all of which bear 1 to several persistent, awidike, iiarren 

 branches; lirstouti'r glunu' snudl. sccoiul larger, lloral glume of the 

 barren lloret equalling the second oi' longer, all three membranous; 

 lloral glume of tlu^ fertile lloret llrm,. StanuMis ',\. Styles distinct, 

 (irain enclosed, but not adherent. Annual grasses with Hat leaf- 

 blades. Panicle terminal. 



Specii's very variable, about 35, though lientham said, in fien- 

 cra riantarum, ''Hardly more than 10 that are well dciiiied.'" Ex- 

 tensively distributed over tlie warmer and temperate regions of the 

 globe. ^lost of them are considered weeds, thougli the young 

 j)lant ami the seeds make wholesome food for many domestic ani- 

 .mals. 



The older authors included Chamivraphis {Setaria) in Pani- 

 cum, aiul it has been restored as a section by 8tudel and Doel. It 

 is easily recognized by the dense spikelike panicle, usually bristling 

 with numerous setae issuing from the pedicels below the spikelets. 

 The setie are not epidermal, like the hairs of many plants, but are 

 thought to represent abortive branchlets inserted bc/owthc articida- 

 tion of the pedicels. A few species have the lower llower perfect as 

 well as tho ui)pcr, which is quite exceptional in Pionrew. Ptniir/nn 

 n>n's(>tu)» Trill, has a single awn on some of the pedicels, and on this 

 account has been by some called Setaria imiscta, while Presl called 

 it Urochloa uniseta, and Schlecht founded a genus for it called Ix- 

 ophorus. 



