194 POACE^. 



a. Awns united, solid and twisted at the base less than 2 cm. 



long (b) 



b. Floral glume to the base of the diverging awns 30 mm. 



long 5 



b. Floral glume to the base of the diverging awns 15 mm. 



long 6 



b. Floral glume to the base of the diverging awns 10 mm. 



long 7 



b. Floral glume to the base of the diverging awns 6-10 



mm. long 8, 9 



a. Base of one or more awns with one or more wide curls at 



the base when dry (b) 



b. Spikelets in a long strict spike 10, 11 



b. Spikelets in simple panicles 13 



a. Base of the awns sj^irally curled little if any, though often 



bent when dry (b) 



b. Lower empty glume the longer (c) 



c. First glume 12 mm., second 7-9 mm. long, floral 



glume 8 mm. long 13 



c. First glume 7-12 mm., floral glume 4-7 mm. long. 14 

 b. Empty glumes equal or tlie upper one longer. . . (c) 

 c. First glume half as long as the second, some of . 26 

 c. Less than half difference in the glumes of any spike- 

 let (d) 



d. Floral glume 15 mm. long, first glume 3-7- 



nerved 15 



d. Floral glume 4 mm. long, first glume 1-nerved. 16 

 d. Floral glume 4.5 mm. long, first glume 1- 



nerved 17 



d. Floral glume 5-14 mm. long, first glume 1- 



nerved (e) 



e. Panicle 20-60 cm. long, rays 10-15 cm. long, 

 flower-bearing above the middle. . . .18 



c. Also some plants of 19 



e. Panicle spikelike 30 cm. long with no rays 

 which are 10 cm. long or much interrui)ted. 20 



