AGROSTIDE^. 321 



a. Awn little or not exserted. . . , (b) 



f. Panicle simple, branches capillary, awn usually 



slightly projecting, culms with few leaves ... 9 

 and possibly some oi' 10, 11 



f. Panicle spikelike 10 



B. Floret awnless. (b) 



b. Spikelet less than 2 mm. long (rarely 2 in no., 18) . (g) 



g. Panicle narrow, thin, j^urple, empty glumes and 

 floral glume reaching to the same height. . . .35 



g. Panicle with long capillary rays, flower-bearing only 



near the ends, sometimes plants of 11 



g. Panicle dense, usually pale green 17 



b. Spikelet 2-4 (very rarely less than 2) mm. long. . • (h) 

 h. Panicle dense, somewhat lobed, usually pale green, 



ligule 3-5 mm. long 17 



h. Panicle not dense, though sometimes simple. . . (i) 



i. Panicle 3-8 cm. long, purple. ...... (j) 



j. Blades involute 18 



j. Blades flat 20 



i. Panicle of well-grown plants more than 8 cm. 



long (k) 



k. Palea 1.3-2.3 mm. long, as long as its glume. (1) 

 1. Ligule 3-5 mm. long, rays 8-15. . . .21 

 1. Ligule 3-5 mm. long, rays 15-25, panicle 



denser, 15-25 cm. long. 22 



k. Palea or minute (m) 



m. Panicle light green, rays erect, spikelet 



2-2.5-3 mm.^ 13, 14 



m. Plant 30-60 cm. high (n) 



n. Panicle pale green, 10-18 cm. long, 



flower-bearing from near the middle. 12 

 n. Panicle simple, thin, rays flower- 

 bearing near the tips (o) 



o. Panicle 10-12 cm. long. . . .23 

 o. Panicle 20-30 cm. long, jiossibly 

 some of 10 



