A(iH(>STll>K.K 101 



C. Empty gluiiies sai-eatc :it tlie liiiso, iiuirli loni^cr 



tluiii the llural «;liiiiu's {>',' 



O. Empty ^luiiu's not tiaccuto at the baso. . . (d) 

 d. Empty «jlunn's snhiM|ual, hdijji'r than the Moral 

 glume, each ahniptly terminating in a short 



awn; inllorescenee spikelike .")('» 



d. Empty ghiines sul)e(pial, h)nger than the lh>ral 

 glume, usually bilid, each terminating in a 

 slender awn; inllorescenee spikelike, often 



interrupted •'»•! 



d. Emi)ty glumes slightly unc<|ual, a little 

 shorter than the tloral glume, acute; inllores- 

 cenee spikelike ."»,") 



d. Empty glumes or inllorescenee or both un- 

 like those of '^< . — '- — '■ r~: — r- 55. 5(5, Cri (e) 

 0. Plant anujud. dwarf, 5-(J('m. high, empty 

 glumes minute, awnless; spikelels 1.5 

 mm. long, awnless. Stamen 1. . . . 51* 

 c. Plant annual, taller, empty glumes plu- 

 mose ]•* 



C. Plants usually much larger. Stanu'us "i -IJ ; 

 grain dehiscent, .seed esciiping, at least 



when wet, glunuvs all awidess (io 



e. Plants uidike 5'.>, Hi) (I) 



1'. Floral glume bearing a prominent awn 

 2-4 times its own length, a little below 



the apex (g) 



g. Awn twisted (i;; 



g. Awn ii>t twisted "il 



f. Floral glume without an awn or oidy a 



short slender awn (g) 



g. Callus or prolongation of the rachis 

 bearing a tuft of hairs, at least one- 

 third as long as the tloral glume. . (i) 

 i. Floral glume and palea thin, 

 membranous (iS 



