498 POACE^. 



EUMELICA. 



Spikelefs 6-16 mm. long, tvith 2-8 {rarely 1) perfect florets, 

 floral (jlume apparently many-nerved beloio {at least lolien d7'y), ^vith 

 a broad margin scarious above. 



C. Culms not bulbiferous. (e) 



e. Empty glumes very unequal and decidedly shorter 



than the 3-5-flowered spikelets (f) 



f. Panicle diffusely branched, many-flowered. ... 7 



f. Panicle narrow, the slender branches erect. ... 8 

 e. Empty glumes unequal, the second nearly or quite as 



long as the spikelet (g) 



g. Panicle with 6-15 large pendulous sjiikelets, form- 

 ing a simple secund raceme 9 



g. Panicle strict, densely many-flowered above, pedi- 

 cels erect 10 



e. Empty glumes sube'qual, nearly as long as the spike- 

 lets (h) 



h. Ligule "2-3 mm. long, floral glume 5.5 mm. long. . 11 



h. Ligule 3 mm. long, floral glume 9 mm. long. . . 13 



h. Ligule 5-7 mm. long, floral glume 6-7 mm. long. 13 



h. Ligule 1-2 mm. long, floral glume 8-10 mm^ long. 14 



D. Culms bulbous, excepting some plants of no. 13. . . . (i) 

 i. Second glume decidedly shorter than the third, floral 



glume 7-8 mm. long 15 



i. Second glume as long as the third, or nearly as long, (k) 



k. Floral glume 6-7 mm. long 16 



k. Floral glume 9 mm. long 17 



Bromeltca. 



Spikelets of 2-8 yjer/ec^ florets, the lower exceeding the empty 

 glumes ; floral glume prominently 7-nerved, apiculate or distinctly 

 awned by the excurrent midnerve at the notclied or bifid or nar- 

 rowly truncate or rarely long attenuate tip. (Thurber.) 



E. Culms bulbiferous, panicle with spreading, very un- 

 equal few-flowered rays (m) 



