AGROSTIDE^, 285 



p. Leaf- blades of culm about 2 cm. 



long 25 



p. Leaf-blades of culm 3 or more 



cm. long (q) 



q. Annual, roots fibrous. . . 26 

 q. Perennial, with creeping 



rootstocks 27 



h. Floral glume 1-nerved or nerveless (r) 



r. Empty glumes both nerveless (s) 



s. Panicle terminal, 20-30 cm. long. . . 28 

 S. Panicle terminal, 8-16 mm. long, . . 29 

 s. Panicles terminal and lateral, 4-8 cm. 



long 30 



r. Empty glumes one or both 1-nerved. . . (t) 

 t. Panicle spikelike, 1— 4 cm., floral glume 



2.7 mm. long 31 



t. Panicle at length pyramidal, 3-5 cm., 



floral glume 1.5 mm. long. ... 32, 33 

 t. Panicle ovoid, 4-6 cm., floral glume 1.7- 



2.3 mm. long 34 



t. Panicle spikelike, 3-7 cm., floral glume 



2-3 mm. long 35 



t. Panicle more than 7 cm. long. . . . (u) 

 u. Panicle broadly pyramidal, 10-16 

 cm. long, rays rigid, first glume 1 

 mm., second and floral glumes 2-2.3 



mm. long 36 



u. Panicle slender, pyramidal, 10-18 cm. 

 long, first glume 0.5 mm., second 

 glume 1 mm., floral glume 1.5 mm. 



long 37 



u. Panicle slender, 15-25 cm. long, first 



glume 1 mm,, second glume 1.5 mm., 



floral glume 1.7-2 mm. long. ... 38 



u. Panicle spikelike or pyramidal, 6-10 



cm. long, first glume 0.6-0.7 mm.. 



